FOREIGN FUZE MANUAL-FREE WORLD

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP09-01333R000100030001-0
• Release Decision: RIFPUB
• Original Classification: C
• Document Page Count: 784
• Document Creation Date: December 23, 2016
• Document Release Date: October 29, 2013
• Sequence Number: 1
• Publication Date: September 1, 1975
• Content Type: REPORT

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CONFIDENTI4U,
AST-116011-001-15
REFERENCE
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AUS ARMY MATERIEL COMMAND INTELLIGENCE DOCUMENT
NO FOREIGN DISSEM
DISTRIBUTION LIMITED TO US GOVERNMENT AGENCIES ONLY
(FOREIGN MATERIEL CLASSIFICATION INFORMATION). OTHER
REQUESTS FOR THIS DOCUMENT MUST BE REFERRED TO THE
ARMY MATERIEL COMMAND.
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CONFIDENTIAL
FOREIGN FUZE MANUAL?FREE WORLD (U)
George M. Agamy
AST-116011-001-75
DATE OF PUBLICATION
September 1975
Information Cutoff Date
May 1975
NATIONAL SECURITY INFORMATION
Unauthorized disclosure subject to
criminal sanctions
? This product was prepared by the US Army Foreign Science
'and Technology Center and is intended for use within the
Army Materiel Command.
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FIDENTIAL
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J
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PREFACE
(U) The purpose of this technical handbook on free world fuzes is to provide US
Army fuze designers with the foreign state-of-the-art and developmental trends. This
handbook should also be of value to other research and development organizations,
planners, explosive ordnance disposal personnel, and intelligence staffs throughout the
Department of Defense.
(U) Included in this handbook are standard, developmental, and obsolescent foreign
Army land service fuzes. Excluded?except for bomb fuzes with artillery, mortar, or rocket
ammunition applications?are Navy and Air Force fuzing.
(U) General descriptions; design details; functioning descriptions; material and
explosives used; performance, test, and packaging data; status; dimensions; and weights have
been provided, if available. In addition, there are many illustrations?contour drawings, full
views with markings, section views, and exploded views?of the components of each fuze.
(U) Fuze categories presently treated in this manual are point detonating, point
initiating base detonating, base detonating, time, proximity, electric, mine, and grenade;
others will be added as new information warrants. Design details and functioning of fuze
components such as delayed-arming mechanisms, timers, and safety and arming devices are
described. These fuzes have application for bombs, grenades, mines, antitank guided
missiles, antiaircraft guided missiles, artillery, small arms (20 through 30 mm), mortars,
rockets, and recoilless ammunition.
(U) Requests for information on Army land service free world fuzes not contained in
this handbook should be forwarded to the Commander, US Army Foreign Science and
Technology Center, Charlottesville, VA 22901 (ATTN: AMXST-PO).
(U) Constructive criticisms, comments, or suggested changes are encouraged and
should be forwarded to the Commander, US Army Foreign Science and Technology Center,
Charlottesville, VA 22901 (ATTN: AMXST-PO).
hi
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LIST OF EFFECTIVE PAGES
AST-1160H-001-75
SUBJECT MATTER
PAGE NUMBERS
DATE
Tide
Preface
List of Effective Pages
Record of Changes
Table of Contents
Summary
List of Abbreviations
Section I
Section II
Section 111
Section IV
Section V
Section VI
Section VII
Section VIII
Section IX
Section X
Appendix
Appendix II
Appendix III
Appendix IV
Distribution List
None
iii (Reverse Blank)
v (Reverse Blank)
vu (Reverse Blank)
ix and x
xi and xii
xni (Reverse Blank)
1-1 thru 1-4
2-1 thru 2-301 (Reverse Blank)
3-1 thru 3-46
4-1 thru 4-106
5-1 thru 5-84
6-1 dub 6-48q ,
7-1 thru 7-51 (Reverse Blank)
8-1 thru 8-60
9-1 thru 9-33 (Reverse Blank)
10-1 thru 10-12
1-1 thru 1-4
11-1 thru 11-4
111-1 thru 111-3 (Reverse Blank)
IV-1 thru 1V-3 (Reverse Blank)
A-1 and A-2
(Reverse Blank)
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RECORD OF CHANGES
ASTA160H-001-75
CHANGE
NUMBER
DATE OF
CHANGE
DATE
ENTERED
SIGNATURE, RANK/RATE AND ORGANIZATION
OF INDIVIDUAL ENTERING CHANGE
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TABLE OF CONTENTS
Page
Preface iii
Summary xi
SECTION I. INTRODUCTION
1. Purpose and Organization
2. Coverage
1-3
1-3
3. FOM Nos.
1-4
4. Data Accuracy and Reliability
1-4
5. Fuze Interchangeability
1-4
6. Production and Testing
1-4
SECTION II. POINT DETONATING FUZES
2-1
SECTION III. POINT INITIATING, BASE DETONATING FUZES
3-1
SECTION IV. BASE DETONATING FUZES
4-1
SECTION V. TIME FUZES
5-1
SECTION VI. PROXIMITY (VT) FUZES
6-1
SECTION VII. MINE AND GRENADE FUZES
7-1
SECTION VIII. DELAY ARMING MECHANISMS, TIMERS, AND
S&A DEVICES
8-1
SECTION IX. ELECTRIC FUZES, INITIATORS, AND IGNITERS
9-1
SECTION X. DEVELOPMENTAL TRENDS
1. General
10-3
2. Point Detonating Fuzes
10-3
3. Point Initiating, Base Detonating Fuzes
10-7
4. Base Detonating Fuzes
10-8
IX
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TABLE OF CONTENTS (Continued)
Page
5. Time Fuzes 10-8
6. Proximity (VT) Fuzes 10-9
7. Mine and Grenade Fuzes 10-10
8. Electric Fuzes 10-10
APPENDIX I. Current Characteristics of French PDSD Fuzes, 20 to 30 mm 1-1
APPENDIX II. Evolution of Bofors PDSD Fuzes 11-1
APPENDIX III. Evolution from NVT-2 Prototype III-1
APPENDIX IV. Conversion Tables: Metric and US Units IV-1
Distribution List A-1
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SUMMARY
(U) France, Switzerland, Sweden, Israel, Norway, United Kingdom, Belgium, Italy,
Spainand the Netherlands are among the free world countries actively engaged in fuze
development. Undertaken primarily to meet specific military requirements of the nations
involved, these efforts are directed toward the improvement of fuze safety, reliability, and
maintainability as well as the reduction of fuze cost and inventory, by using common parts
and by incorporating multipurpose options into a single fuze.
(U) Most point detonating (PD) fuze developments for bombs, artillery, rockets,
mortars, small arms (20 through 30 mm), and recoilless ammunition have been in the area of
mortars and antiaircraft ammunition. Antiaircraft PD fuze efforts have been concentrated
on design refinement to increase arming distance, improve safety and reliability, and reduce
cost through parts commonalty and automated production. Mortar PD fuzes are being
designed to assure safety against double loading, improve graze-sensitivity features, provide
positive safety for parachute delivery, improve bore safety, increase arming distance, and
increase ammunition effectiveness.
(C) Most point initiating, base detonating, (PIED) fuze developmental effort has been
devoted to shapeckcharge munitions for shoulder-fired weapons and/Or antitank guided
missiles. French achievements in the PIBD area have been most prolific; their technology
surpasses the US current state=of-the-art. For example, their use of a piezogenerator
function makes unnecessary a graze mechanism and arming delay timer, thereby reducing
cost and simplifying fuze design. Their use of rocket motor pressure as an arming sensor
coupled with a bore rider technique enhances safety. Their use of an impedance matching
transformer that effectively couples a high-impedance piezoid with a low-impedance
detonator increases reliability. Their hot-wire bridge detonator technology results in reliable
initiation of a booster without the need for a lead charge. The technology of the United
Kingdom and Japan, on the other hand, is similar to US technology and reflects current
state-of-the-art. Swedish developers use a series of piezocrystals and a diode in the flat of the
projectile: the use of a diode is an inexpensive technique to provide brush discrimination;
the series of crystals in the flat of the projectile enhances reliability since such a fuze cannot
be defeated by unconventional or bar armor.
. (LT) Most designs for base detonating (BD) fuzes reflect current state-of-the-art, use
mechanics or electromechanics principles, and incorporate pyrotechnic delay, self-destruct,
graze sensitivity, and/or instantaneous functioning.
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AST-116OH?001-75 Original
(U) Pyrotechnic time train fuzes have been replaced by mechanical time fuzes. Efforts
are being directed toward developing an accurate timer and fuze that can be readily set,
toward increasing safety and reliability, and toward developing an efficient backup impact
function. Although electronic timers offer better accuracy than mechanical timers, there has
been no concerted effort to develop them.
(U) Considerable effort is being expended in the development of doppler, infrared,
and capacitance-type proximity or VT fuzing. Current proximity fuzing efforts are aimed at
improving antennas, infrared techniques, and electronics. Through the use of integrated
circuit chips and encapsulation technology, tube types are being converted to transistorized
versions, thereby reducing fuze cost and size.
(U) Efforts are also being made to improve battery technology and to develop a
mechanical means, via a turbine-generator concept, of powering the fuze.
(C) Although no ECCM techniques are being employed in VT or proximity fuzing,
the Netherlands and Sweden are conducting research on these techniques. To date, most
countries rely on turning the electronics on as late as possible when the projectile or
warhead is in the downward trajectory. Except for Sweden and Israel, very little work is
being done on electric fuze development.
(U) There has been little advance in the state-of=the-art of mine and grenade fuzes.
Grenade fuzes are still of the pyrotechnic delay type, whereas mine fuzes are pressure
activated.
(U) Several years ago West Germany, in conjunction with France, was working on
improved conventional munitions(ICM) minelet fuzing and had incurred problems with the
self-sterilization feature of the fuzing. There is no evidence to indicate continuing
development of this fuze.
xii
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LIST OF ABBREVIATIONS
APHEI armor-piercing, high-explosive incendiary
ATGM antitank guided missile
AWG American Wire Gage
BD base detonating
HE high explosive
HEAT high-explosive antitank
HEI high-explosive incendiary
HEI-T high-explosive incendiary, with tracer
HEP high-explosive plastic
HESH high-explosive squash head
ICM improved conventional munitions
MT mechanical time
MTSQ mechanical time superquick
MV with delay (German)
OV without delay (German)
PD point detonating
PDSD point detonating, self-destroying
PDU pressure delay unit
PIBD point initiating, base detonating
PPO polyphenylene oxide
RTV temperature vulcanizing rubber
S&A safety and arming
SAU safety arming unit
SQ superquick
SSQ super-superquick
SWG Standard Wire Gage
TPI threads per inch
UNC unified coarse (thread)
UNE unified fine (thread)
UNS unified special (thread)
VT variable time (proximity)
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Section 1.
INTRODUCTION
NO FOREIGN DISSEM
1-1
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Section I.
INTRODUCTION
1. (U) Purpose and Organization
a. Purpose. This technical handbook on free world foreign fuzes provides US Army
fuze designers with the foreign state-of-the-art and developmental trends. It will also be
useful to other research and development organizations, planners, explosive ordnance
disposal personnel, and intelligence staffs throughout the Department of Defense.
b. Organization.
(1) To facilitate retrieval of information, this handbook is organized as follows:
Section 1 Introduction
Section II Point Detonating Fuzes
Section in Point Initiating, Base Detonating Fuzes
Section IV Base Detonating Fuzes
Section V Time Fuzes
Section VI Proximity Fuzes
Section VII Mine and Grenade Fuzes
Section VIII Delayed Arming Mechanisms, Timers, and S&A Devices
Section IX Electric Fuzes, Initiators, and Igniters
Section X Developmental Trends
New sections will be added as information becomes available.
(2) In addition, indexes of all fuzes as well as lists of illustrations are provided at
the beginning of sections II through IX.
(3) Except for contour or section drawings of various fuzes, dimensions and
weights are in the metric and English systems. Appendix IV contains conversion tables for
metric and English units.
(U) Coverage
a. Included in this handbook are developmental and standard fuzes as well as some
obsolescent fuzes for grenades, mines, bombs, antitank guided missiles, antiaircraft guided
missiles, artillery, mortars, rockets, small arms (20 through 30 mm), and recoilless
ammunition.
1-3
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AST-1160H-001-75 Original
b. Technical data sheets are provided for each fuze including, if available,
illustrations such as contour drawings, section views, full views, and exploded views.
Technical characteristics include general descriptions, design details, functioning
descriptions, materials and explosives used, performance data, test data, packaging data,
status, dimensions, and weights.
3. (U) FOM Nos.
All fuzes, including components such as timers, delayed-arming mechanisms, and safety and
arming (S&A) devices, have been assigned Foreign Materiel Catalog Numbers (FOM Nos.) in
accordance with existing US Army Foreign Science and Technology procedures.
4. (U) Data Accuracy and Reliability
Data presented in this handbook are considered reasonably accurate and reliable. They have
been derived from laboratory examination and testing of hardware, company brochures,
foreign test reports, and highly reliable intelligence reports.
5. (U) Fuze Interchangeability
No attempt should be made to use this handbook as an authoritative source on fuze
interchangeability or to test fire fuzes with ammunition other than that for which the fuze
was specifically designed.
6. (U) Production and Testing
a. Production. Not much information is available on production facilities of the
various designers or producers of foreign fuzes. Analyses of available hardware indicate good
quality of workmanship with advanced manufacturing techniques used.
b. Testing. Most fuzes produced have undergone jolt, 40-ft drop, transportation,
vibration, temperature and humidity, salt spray, waterproofness, fungus resistance, extreme
temperature storage, rough handling, static detonator safety, sand and dust, environmental,
and climatic testing in accordance with US Military Standard 331.
1-4
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Section II.
POINT DETONATING FUZES
2-1
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Section II.
POINT DETONATING FUZES
GENERAL
(U) Point detonating (PD) fuzes have been designed or are under development for
artillery, rocket, mortar, bomb, small arms (20 through 30 mm), and recoilless ammunition
applications. These fuzes usually function on mechanical or electrical principles, by contact
with the target, and with detonation at the nose end of the projectile or warhead. PD fuzes
afford the most direct solution to fuzing problems and, therefore, normally do not require
an excessively complex design.
(U) Most fuze developments included in this handbook have been designed for
superquick (SQ) or delay functioning upon impact; some of them incorporate a
graze-sensitive or self-destruet feature. Most fuzes require either a setback or centrifugal
force environmental stimulus for arming; almost all have delayed arming, usually
accomplished by mechanical means. With the exception of some older obsolescent types,
the fuze designs presented in this handbook are well within the current state-of-the-art and,
in some instances, incorporate unique features. The fuzes described in this section are
designed for either high- or low-"g" accelerations and for fin- or spin-stabilized projectiles or
warheads.
2-3
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FOM No.
INDEX
Nomenclature*
AST-1160H-001-75
Page
1390-16-1-1
Fuze, PD, Model AZ DM 111
2-11
1390-16-1-2
Fuze, PD, Model AZ DM 111A1
2-17
1390-16-1-4
Fuze, PDSD, Model AZZ DM 131
2-21
1390-16-1-6
Fuze, PDSD, Model AZZ M594 (XM594)
2-25
1390-16-1-9-1
Fuze, PD, Model AZ DM 11IA3
2-29
1390-16-1-13
Fuze, PD, Model AZ DM 221
2-33
1390-16-1-15
Fuze, PD, Model AZ DM 51
2-37
1390-16-1-16
Fuze, PD, Model Diehl
2-39
1390-16-1-20
Fuze, PDSD, Model AZZ DM 31
2-47
1390-16-1-21
Fuze, PDSD, Model AZZ DM 281A1
2-51
1390-16-1-23
Fuze, PDSD, Model AZZ DM 121
2-57
1390-16-1-24
Fuze, PD, Model AZ DM 21
2-59
1390-16-1-25
Fuze, PD, Model AZ DM 41
2-61
1390-16-1-26
Fuze, PD, Model AZ DM 211
2-63
1390-16-1-27
Fuze, PD, Model AZ DM 71
2-67
1390-16-1-28
Fuze, PD, Model AZ DM 151
2-69
1390-16-1-29
Fuze, PD, Model AZ DM 241
2-71
1390-16-1-40
Fuze, PDSD, Model AZZ DM 91
2-73
1390-17-1-1
Fuze, PD, Model 21/28
2-75
1390-17-1-2
Fuze, PD, Model V-18-I
2-79
13 90-1 7-1-3
Fuze, PD, Model V-19
2-83
1390-17-1-4
Fuze, PD, Model SC-12
2-89
1390-17-1-11
Fuze, PD, Model FUI-F2
2-99
13 90-1 7-1-12
Fuze, PD, Model V-5
2-107
1390-17-1-17
Fuze, PD, Model V-19-P
2-117
1390-17-1-18
Fuze, PDSD, Model FDPA 1502
2-125
1390-17-1-21
Fuze, PDSD, Model FUA 723 (France)
2-129
1390-18-1-6
Fuze, PD, Model FIRUSAT
2-133
13 90-1 8-1-18
Fuze, PD, Model A
2-141
1390-18-1-35
Fuze, PD, Model RKVDIR 0265
2-147
1390-18-1-36
Fuze, PD, Model 21 RKZ-2
2-155
13 90-1 8-1-39
Fuze, PD, Model RKVDIR 0262/7B
2-165
1390-18-1-40
Fuze, PD, Model RKVDIR 0264
2-169
1390-18-1-41
Fuze, PD, Model RKVDIR MZX-325
2-173
'All fuze nomenclatures arc UNCLASSIFIED,
2-5
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FOM No.
Nomenclature*
Original
Page
1390-18-1-42
Fuze, PD, Model RKVDIR 0265/21
2-177
1390-18-1-43
Fuze, PD, Model RKVDIR MZX-328
2-181
1390-18-1-44
Fuze, PDSD, Oer'ikon, Type KZD-0250
2-185
1390-18-1-47
Fuze, PDSD, Hispano-Suiza, Model AM-2-BM
2-189
1390-18-2-1
Fuze, PD, Model KVD
2-193
1390-19-1-2
Fuze, PDSD, Model FZ-104
2-199
1390-19-1-9
Fuze, PD, Model ?
2-211
1390-23-1-4
Fuze, PD, Model FB-267
2-215
1390-23-1-5
Fuze, PDSD, Model M4A7
2-221
1390-23-1-6
Fuze, PDSD, Model M6
2-227
1390-23-1-9
Fuze, PDSD, Model M5
2-235
1390-23-2-2
Fuze, PD, Model 225A
2-241
1390-24-1-2
Fuze, PD, Model 53
2-247
1390-2471-3
Fuze, PD, Model D
2-253
1390-35-1-17
Fuze, PD, Model L35A1
2-259
1390-35-1-32
Fuze, PD, Model 944, Mkl
2-267
1390-37-1-2
Fuze, PD, Model M2
2-271
1390-37-1-3
Fuze, PD, Model M150
2-275
1390-37-1-5
Fuze, PD, Model ?
2-281
1390-37-1-9
Fuze, PDSD, Type ?
2-287
1390-37-2-2
Fuze, PD, Model V18I.R.
2-291
1390-39-1-1
Fuze, PD, Model M.K.E. 101
2-297
*All fuze nomenclatures arc UNCLASSIFIED
2-6
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original AST-1160H-001-75
LIST OF ILLUSTRATIONS
Figure Title* Page
2-1
Fuze, PD, Model AZ DM 111, full and contour views
2-11
2-2
Fuze, PD, Model AZ DM 111, disassembled components
2-13
2-3
Fuze, PD, Model AZ DM 111, detailed section view
2-14
2-4
Fuze, PD, Model AZ DM 111A1, full and contour views
2-17
2-5
Fuze, PDSD, Model AZZ DM 131, contour and section views
2-21
2-6
Fuze, PDSD, Model AZZ M594, section view
2-25
2-7
Fuze, PDSD, Model AZZ M594, performance curves
2-28
2-8
Fuze, PD, Model AZ DM 111A3
2-29
2-9
Fuze, PD, Model AZ DM 221, section view
2-33
2-10
Fuze, PD, Model Diehl with 106-mm fragmentation
projectile
2-39
2-11
Fuze, PD, Model Diehl, section view
2-41
2-12
Fuze, PD, Model Diehl, section view of delay-arming
mechanism
2-42
2-13
Fuze, PD, Model Diehl, section view of components
in safe position
2-44
2-14
Fuze, PD, Model Diehl, section view of components
in armed position
2-44
2-15
Fuze, Model Diehl, inertial ignition with delay
action
2-45
2-16
Fuze, PDSD, Model AZZ DM 31, section view
2-47
2-17
Fuze, PDSD, Model AZZ DM 281A1, section view
2-51
2-18
Fuze, PDSD, Model AZZ DM 281A1, self-destruct
as a function of range
2-54
2-19
Fuze, PD, Model AZ DM 211, full view
2-63
2-20
Fuze, PD, Model AZ DM 211, section view
2-64
2-21
Fuze, PD, Model 21/28, full view
2-75
2-22
Fuze, PD, Model 21/28, section view
2-77
2-23
Fuze, PD, Model V-18-I, full view
2-79
2-24
Fuze, PD, Model V-184, contour and section views
2-81
2-25
Fuze, PD, Model V-19, full and contour views
2-83
2-26
Fuze, PD, Model V-19, exploded view
2-85
2-27
Fuze, PD, Model V-19, section view
2-86
2-28
Fuze, PD, Model SC-12, section view
2-89
2-29
Fuze, PD, Model SC-12, section view depicting components
in safe position
2-91
*All figure titles are UNCLASSIFIED.
2-7
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75
Figure Title*
2-30 Fuze, PD, Model SC-12, section view depicting delay-arming
Original
Page
selection
2-93
2-31
Fuze, PD, Model SC-12, section view depicting inertial
lock in rearward position
2-94
2-32
Fuze, PD, Model SC-12, section view depicting fuze
in armed position
2-95
2-33
Fuze, PD, Model SC-12, section view depicting
firing-pin action upon impact
2-96
2-34
Fuze, PD, Model SC-12, section view depicting action
upon graze impact
2-97
2-35
Fuze, PD, Model FUI-F2, dimensioned cutaway view
2-99
2-36
Fuze, PD, Model FUI-F2, cutaway with components
2-101
2-37
Fuze, PD, Model FUI-F2, section view
2-103
2-38
Fuze, PD, Model FUI-F2, functioning views
2-104
2-39
Fuze, PD, Model V-5, section view
2-107
2-40
Fuze, PD, Model V-5, details of clockwork
2-111
2-41
Fuze, PD, Model V-5, details of rack
2-112
2-42
Fuze, PD, Model V-5, details of primer drum
2-113
2-43
Fuze, PD, Model V-5, section view, armed and
unarmed positions
2-114
2-44
Fuze, PD, Model V-19-P, full view
2-117
2-45
Fuze, PD, Model V-19-P, section view, safe position
2-119
2-46
Fuze, PD, Model V-19-P, section view depicting setback
action
2-121
2-47
Fuze, PD, Model V-19-P, section view depicting components
in armed position
2-122
2-48
Fuze, PD, Model V-19-P, section view depicting firing-pin
and locking-plate camming action
2-123
2-49
Fuze, PDSD, Model FDPA 1502, section view
2425
2-50
Fuze, PDSD, Model FUA 723, section view
2-129
2-51
Fuze, PD, Model FIRUSAT, contour and section views
2-133
2-52
Fuze, PD, Model FIRUSAT, section view
2-136
2-53
Fuze, PD, Model FIRUSAT, runaway escapement interface view
2-138
2-54
Fuze, PD, Model A, contour view
2-141
2-55
Fuze, PD, Model A
2-143
2-56
Fuze, PD, Model RKVDIR 0265, full and contour views
2-147
*All figure titles are UNCLASSIFIED.
2-8
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original
Figure
2-57
AST-116011-001-75
Title* Page
Fuze, PD, Model RKVDIR 0265, detailed sections A-A,
B-B, D-D, and G
2-149
2-58
Fuze, PD, Model RKVDIR 0265, detailed sections C-C,
E-E, and F-F
2-150
2-59
Fuze, PD, Model RKVDIR 0265, packaging container
2-152
2-60
Fuze, PD, Model 21 RKZ-2, full and contour views
2-155
2-61
Fuze, PD, Model 21 RKZ-2, section view
2-157
2-62
Fuze, PD, Model 21 RKZ-2, SQ functioning
2-160
2-63
Fuze, PD, Model 21 RKZ-2, delay functioning
2-161
2-64
Fuze, PD, Model 21 RKZ-2, packaging container
2-162
2-65
Fuze, PD, Model RKVDIR 0262/7B with 81-mm projectile
2-165
2-66
Fuze, PD, Model RKVDIR 0264 with 81-mm projectile
2-169
2-67
Fuze, PD, Model RKVDIR MZX-325 with 81-mm projectile
2-173
2-68
Fuze, PD, Model RKVDIR 0265/21 with 81-mm projectile
2-177
2-69
Fuze, PD, Model RKVDIR MZX-328 with 81-mm projectile
2-181
2-70
Fuze, PDSD, Type KZD-0250, section view
2-185
2-71
Fuze, PDSD, Model AM-2-BM, section view
2-189
2-72
Fuze, PD, Model KVD, full and contour views
2-193
2-73
Fuze, PD, Model KVD, exploded view
2-195
2-74
Fuze, PD, Model KVD, section view
2-196
2-75
Fuze, PDSD, Model FZ-104, full view
2-199
2-76
Fuze, PDSD, Model FZ-104, contour and section views
2-204
2-77
Fuze, PDSD, Model FZ-104, cutaways of fuze depicting safe,
unarmed, and armed conditions
2-205
2-78
Fuze, PD, Model ?, section view
2-211
2-79
Fuze, PD, Model FB-267, contour view
2-215
2-80
Fuze, PD, Model FB-267, section view, unarmed position
2-217
2-81
Fuze, PD, Model FB-267, section view, armed position
2-219
2-82
Fuze, PDSD, Model M4A7, full view
2-221
2-83
Fuze, PDSD, Model M4A7, contour and section views
2-224
2-84
Fuze, PDSD, Model M6, full view
2-227
2-85
Fuze, PDSD, Model M6, contour and section views
2-230
2-86
Fuze, PDSD, Model M6', shipping box
2-233
2-87
Fuze, PDSD, Model M5, full view
2-235
2-88
Fuze, PDSD, Model M5, section view
2-238
2-89
Fuze, PD, Model 225A, section views of unarmed and armed
positions
2-241
*All figure titles are UNCLASSIFIED.
2-9
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST1160H001-75
Figure Title*
2-90 Fuze, PD, Model 225A, impact position, no-graze and
Original
Page
graze actions
2-244
2-91
Fuze, PD, Model 53, full and cutaway views
2-247
2-92
Fuze, PD, Model 53, exploded view
2-249
2-93
Fuze, PD, Model 53, section view
2-251
2-94
Fuze, PD, Model D, full view
2-253
2-95
Fuze, PD, Model D, section view
2-255
2-96
Fuze, PD, Model L35A1, full and contour views
2-259
2-97
Fuze, PD, Model L35A1, section view
2-2611
2-98
Fuze, PD, Model 944 Mk 1
2-267
2-99
Fuze, PD, Model M2, section view
2-271
2-100
Fuze, PD, Model M150, full view
2-275
2-101
Fuze, PD, Model M150, contour view
2-277
2-102
Fuze, PD, Model M150, block diagram, functioning sequence
2-278
2-103
Fuze, PD, Model ?, full view with 52-mm projectile
2-281
2-104
Fuze, PD, Model ?, exploded view
2-283
2-105
Fuze, PD, Model ?, contour and section views
2-284
2-106
Fuze, PDSD, Type ?, full view
2-287
2-107
Fuze, PD, Model V18I.R., full and contour views
2-291
2-108
Fuze, PD, Model V18I.R., exploded view
2-293
2-109
Fuze, PD, Model V18I.R., section view
2-294
2-110
Fuze, PD, Model M.K.E. 101, full view
2-297
2-111
Fuze, PD, Model M.K.E. 101, exploded view
2-299
2-112
Fuze, PD, Model M.K.E. 101, contour and section views
2-300
*All figures titles are UNCLASSIFIED.
2-10
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Original
UNCLASSIFIED
AST-1160H-001-75
Fine, PD, Model AZ DM 111
FOM No. 1390-16-1-1
ALL:DIMENSIONS IN INCHES
(UNCLASSIFIED)
Figure 2-1, Fuze, PD, Model AZ DM 111, full and contour views (U).
(U) Description
The AZ DM 111 PD fuze (fig 2-1) was developed by Junghans of West Germany for use
with 81-mm mortar projectiles. It is a setback, delayed-arming type designed for either delay
or SQ action upon impact. The fuze is considered detonator safe, muzzle safe, and safe
against double loading.
(U) Unique Features
? Pull wire providing positive safety handling.
? Escapement mechanism controlling the arming of the rotor.
? Rotor housing out-of-line SQ and delay primer-detonators.
2-11
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-116011-001-75 Original
Fuze, PD, Model AZ DM 111
FOM No. 1390-16-1-1
(U) Characteristics
Fuze assembly:
Body material Transparent Incite
Weight
Markings OV; MV
Length 3.44 in (87.5 mm)
Body diam 1.49 in (38.1 mm)
Thread diam 1.50 in (38.1 mm)
TPI 12
Booster:
Body material Transparent lucite
Body length 0.78 in (19.8 mm)
Body diam L12 in (28.6 mm)
Explosive
Explosive weight
Functional data:
Arming method Setback
Firing method Impact
Safety devices
Arming distance 50 m
Arming time 7
Delay time
No weights available; itern examined by Picatinily Arsenal was inert.
"Safety wire, locking ball with two setbotk pins, and out-of-line detonators.
2-12
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Original
Design Details
UNCLASSIFIED
2
4
AST116011-001.75
Fuze, PD, Model AZ DM 111
FOM No, 13904644
5
(UNCLASSIFIED)
Figure 2-2, Fuze, PD ,Model AZ DM 111, disassembled components (U).
2-13
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75
Fuze, PD, Model AZ DM 111
FOM No. 1390-164-1
(U) Design Details (Continued)
Original
The AZ DM 111 main components (fig 2-2) consist of a nose section (1), body section
(2), and booster assembly (3). Also shown are top and bottom views of the fuze body
depicting the rotor and escapement mechanism (4) and the bottom of the rotor (5).
17
16
15
14
13
12
(UNCLASSIFIED)
Figure 2-3. Fuze, PD, Model AZ DM 111, detailed section view (U).
2-14
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original AST-I600H-001-75
Fine, PD, Model AZ DM 111
FOM No. 1390-16-1-1
(U) Design Details (Continued)
As illustrated in figure 2-3, the fuze's nose section (4) is bored out to house the
firing-pin assembly (2), consisting of a striker head and firing pin as well as its coiled spring
(3). A firing-pin retainer (18) is used to keep the firing-pin assembly (2) in place. The fuze's
nose section is then sealed by a disk (1), providing a watertight assemblage. The nose section
is threaded externally at its base to facilitate screwing into the fuze body (6).
The fuze body is bored out to house the escapement mechanism, which involves an
escapement lever (17), pinion-gear (7), and rotor-gear (5) arrangement. The rotor (8) has a
locking spring (23) and contains the SQ (21) and delay (9) primer-detonators.
The detent system is contained within holes drilled in the fuze body. This includes the
safety pin (15), safety-pin spring (13), locking ball (16), ball-release pin (14), and
ball-release-pin spring (12). A safety wire (20) locks the safety pin (15) in place and, in turn,
the escapement lever (17) and the rotor (8), providing positive safety during handling.
A hole cut transversely in the fuze body (6) houses the selector (19). The SQ
primer-detonator (21) of the rotor (8) is locked by the positioning pin (22) on the selector
(19). The fine body has a central hole drilled at the rear to house the relay (10) and is
threaded internally to facilitate assembly of the booster (11). The fuze body is threaded
externally to facilitate assembly into 81-mm mortar projectiles.
(U) Functioning
Prior to drop-firing the projectile in the mortar (fig 2-3), the safety wire (20) is
removed from the fine. Upon firing, the ball-release pin (14) moves rearward due to
setback. The locking ball (16) is freed, and the safety pin (15) is released and locked in the
disengaged position by the locking spring (23). The rotor (8) is released to rotate by the
latch in the safety pin (15), which sets back. The same action occurs to the lever (17) of the
escapement, which controls the movement of the rotor until armed.
The movement of the rotor is also limited by the positioning pin (22), which in turn is
controlled by the position of the selector (19). The SQ (OV) or the delay (MV)
primer-detonator (21 or 9, respectively) is brought into the in-line position with the firing
2-15
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-116011-001-75 Original
Fuze, PD, Model AZ DM 111
FOM No. 1390-16-1-1
(U) Functioning (Continued)
Upon impact, the firing pin is driven into the primer-detonator (21 or 9) and in turn
initiates the relay (10) and finally the booster (11), resulting in the detonation of the
high-explosive (HE) filler of the projectile.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
81-mm HE projectiles
81-mm mortar
2-16
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original
AST-116011-001-75
Fuze, PD, Model AZ DM 111A1
FOM No. 1390-16-1-2
MV
FUZE PO LOS SG
- t 115 OIAM
15 OIAM
12 TPI
ALL DIMENSIONS IN INCHES
(UNCLASSIFIED)
Figure 2-4. Fuze, PD, Model AZ DM 111A1, full and contour views (U).
(U) Description
The Junghans AZ DM 111A1 (fig 2-4) is similar in design to the AZ DM 111
(FOM No. 1390-16-1-1), except that the fuze body and booster cup arc made from
aluminum instead of transparent plastic. It is a setback, delayed-arming type designed for
either SQ or delay action upon impact. Besides its use with 81-mm mortar projectiles, it can
also be used with 120-mm fin-stabilized mortar projectiles.
(U) Unique Features
? Pull wire providing positive safety during handling.
? Escapement mechanism for controlling movement of the rotor.
? Rotor housing the SQ or delay prime-detonators in the out-of-line
position.
2-17
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04; CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-116011-001-75 Original
Fuze, PD, Model AZ DM 111A1
FOM No. 139046-1-2
(U) Characteristics
Fuze assembly:
Body material Aluminum
Weight 0.42 lb (191 g)
Markings AZ DM 111A1
Length 3.44 in (87.4 mm)
Maj body diam 1.85 in (50 mm)
Maj thread diam 1.50 in (38.1 mm)
TPI 12
Booster:
Body material Aluminum
Body length 0.805 in (20.45 mm)
Explosive Tetryl
Explosive weight
TPI 20
Functional data:
Arming method Setback
Firing method Impact
Safety devices
Arming distance 50 m
Arming time
Delay time 0.05 s
(U) Functioning
Similar in functioning to the AZ DM 111 (FOM No. 1390-16-1-1).
'Pull wire; locking ball with two setback pins, out-of-line detonators.
2-18
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original AST-11600-001-75
Fuze, PD, Model AZ DM 111A1
FOM No. 1390-16-1-2
(U) Applications (Ammunition and Weapons
Ammunition
Weapons
81-mm HE projectile, Model DM 11
120-mm HE projectile, Model DM 11
81-mm mortar
120-mm mortar
2-19
(Reverse Blank)
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
BLANK PAGE
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Original
UNCLASSIFIED
ASS-1160H-001-75
Fuze, PDSD, Model AZZ DM 131
FOM No. 1390-16-1-4
SECTION A-A
46.3
18 OIAM
15 DIAM
0.75 PITCH
401'
PI
rola
OTIA
94iii
' lir
AVM 3
LEirrAit
tir 44? ?4,
fat .iti:-.4
Ws%
erfir ell y velki
14 A ramp,* 40.
SA tilaA. "Iblti?
-? r?
._ IN
taw es.
I
10 P
1
1
I
1
ALL DIMENSIONS IN MILLIMETERS
LEGEND
1. FIRING PIN
2. FIRING PIN SPRING
3. FIRING PIN SEAT
4. SELF-DESTRUCT SHUTTER PAWL SPRING
5. SELF-DESTRUCT SHUTTER PAWL
6. FIRING PIN LOCK
Neg. 517011
6
7. BOOSTER CUP
8. SELF-DESTRUCT SHUTTER LOCKING PAWL
9. SELF-DESTRUCT SHUTTER
10. ARMING COIL
11. FIRING PIN GUIDE
(UNCLASSIFIED)
Figure 2-5. Fuze, PDSD, Model AZZ DM 131, contour and section views (U).
(U) Description
The AZZ DM 131 fuze (fig 2-5) is a PD fuze with a mechanical self-destruct feature
initiated by spin decay. The fuze is designed to be bore safe but does not have an out-of-line
detonator. It was developed for use in West German-made high-explosive incendiary, with
tracer (HEI-T), cartridges for the 20x139-mm automatic gun, Model Rh 202. This fuze has
been replaced in service by the DM 281 fuze family.
2-21
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PDSD, Model AZZ DM 131
FOM No. 1390-16-1-4
(U) Characteristics
Fuze assembly:
Body material Anodized aluminum
Weight 18.6 g (0.4 lb)
Markings AZZ DM 131
Booster:
Body material Aluminum
Body length
Explosive 7'
Explosive weight 0.35 g (5.6 gr)
Functional data:
Arming method Centrifugal force (arming coil)
Firing method Impact
Safety devices Firing-pin lock and arming coil
Arming distance 6 m
Arming time
Self-destruct time ?8.5 s
Delay time
(U) Functioning
In storage or transport, an arming coil holds a firing-pin lock in position to prevent the
firing pin from moving rearward. A shutter in the self-destruct mechanism restrains the
firing-pin spring from acting on the firing pin. Upon firing, centrifugal force resulting from
projectile spin causes the arming coil to open and he against the inner wall of the arming coil
recess. Centrifugal force also causes the firing-pin lock to move radially outward, removing
any restriction on the rearward movement of the firing pin. This occurs after the projectile
has reached a point about 6 meters in front of the muzzle. The fuze is now armed.
Upon impact with a target beyond this distance, the fuze nose and disk are crushed.
Force is transmitted to the firing pin, which is driven into the detonator to initiate fuze
functioning.
2-22
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PDSD, Model AU DM 131
FOM No. 1390-16-1-4
(U) Functioning (Continued)
The self-destruct mechanism consists of a shutter, two pawls, and a pawl spring. In the
unarmed (storage or transport) position, the shutter prevents rearward movement of the
firing-pin spring seat, against which the firing-pin spring presses. The shutter is held in
position by the shutter pawl, which is prevented by the shutter locking pawl from releasing
the shutter. Upon firing, centrifugal force acts on both the shutter locking pawl and the
shutter pawl, disengaging the shutter locking pawl from the shutter pawl and exerting force
on a weight on the shutter pawl, to keep this pawl engaged with the shutter against the
tendency of the pawl spring to move the pawl out of engagement with the shutter. If impact
does not occur within approximately 8.5 seconds, rotation decays sufficiently for
pawl-spring tension to overcome centrifugal force and rotate the shutter pawl out of
engagement with the shutter. The firing-pin spring acting on the seat forces the shutter
aside, plunging the firing pin into the detonator and initiating fuze functioning.
Several modifications of the DM 131 fuze were developed which were produced only
in limited quantities for test: the DM 131 Al, 131 E-2, and 131 E-3A. The DM 131 E3B
fuze was redesignated fuze, PDSD, M594, and is described under that designation.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
20-mm (20x139-mm) HEI-T (SD)
cartridge, Model DM 51 or DM 51A1
Automatic guns, Models HS 820 and Rh 202
2-23
(Reverse Blank)
UNCLASSIFIED
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UNCLASSIFIED
Original
AST-1160H-001-75
Fuze, PDSD, Model AZZ M594 (XM594)
FOM No. 1390-16-1-6
STRIKER
FIRING PIN SPRING
FIRING PIN SEAT
SELF-DESTRUCT PLATE
SPIRAL RETAINER
ARMING COIL
FIRING PIN
ROTOR
DETONATOR
ROTOR DETENT SPRING
BOOSTER
Neg. 517007 (UNCLASSIFIED)
Figure 2-6. Fuze, PDSD, Model AZZ M594,
section view (U).
2-25
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST -1160H-001-75 Original
Fuze, PDSD, Model AZZ M594 (XM594)
FOM No. 1390-16-1-6
(U) Description
The AZZ M594 fuze (fig 2-6) is a PD fuze with an out-of-line detonator and
self-destruct mechanism. It self-destructs mechanically upon spin decay. Developed during
the mid-1960s by Diehl Wehrtechnik of Roethenback, West Germany, as the
AZZ DM 131 E3B fuze, it is similar in design to fuze, PDSD, Model AZZ DM 281 Al
(FOM No. 1390-16-1-21). The United States is licensed to produce this fuze as the M594.
(U) Characteristics
Fuze assembly:
Body material Steel
Weight 18 to 21 g (0.04 to 0.05 lb)
Markings M594 (XM594)
Booster:
Body material Aluminum alloy
Body length 45.5 mm
Explosive Tetryl
Explosive weight 0.265 g (4.2 gr)
Functional data:
Arming method Spin
Firing method Impact
Safety devices Arming coil; out-of-line detonator
Arming distance ?22 m
Arming time 7
Self-destruct time 5.5 s?1.5 s
(All safe at 15 m; all fire at 40 m)
(U) Functioning
During storage and transport, the rotor that contains the out-of-line detonator is
restrained by a rotor-detent spring, while a spiral retainer surrounded by the arming coil
prevents rearward movement of the firing pin.
2-26
UNCLASSIFIED
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PDSD, Model AZZ M594 (XM594)
FOM No. 1390-16-1-6
(U) Functioning (Continued)
Upon firing, centrifugal force causes the rotor-detent spring to break when rotation
attains a predetermined value, releasing the ball rotor, which rotates until the detonator is
aligned with the firing pin and booster. Centrifugal force also causes the arming coil to open
until it lies against the inner wall of the recess. The spiral retainer also moves outward under
the influence of centrifugal force, thus removing any restriction on the rearward movement
of the firing pin. This occurs between 15 meters and 40 meters in front of the muzzle. The
fuze is now armed.
When the armed fuze impacts a target whose resistance equals or exceeds that of 1-mm
dural, the flange of the striker is sheared off, allowing the striker to drive the firing pin into
the detonator, initiating detonation of the projectile.
If the projectile does not strike a target, self-destruction will occur after about
5.5 seconds, which is beyond the maximum tactical range. The mechanical self-destruct
mechanism is like that of fuze, PDSD, Model AZZ DM 281 Al (FOM No. 1390-16-1-21). It
consists of a shutter, two pawls, and a pawl spring. In the unarmed state, the shutter
prevents rearward movement of the firing-pin spring seat, against which the firing-pin spring
presses. The shutter is held in position by the shutter pawl, which is prevented by the
shutter locking pawl from releasing the shutter. Upon firing, centrifugal force acts on both
the shutter locking pawl and the shutter pawl, disengaging the shutter locking pawl from the
shutter pawl and exerting force on a weight on the shutter pawl, to keep this pawl engaged
with the shutter against the tendency of the pawl spring to move the pawl out of
engagement with the shutter. If impact does not occur within the maximum tactical range,
rotation decays sufficiently for the pawl-spring tension to overcome centrifugal force and
rotate the shutter pawl out of engagement with the shutter. The firing-pin spring acting on
the seat forces the shutter aside, plunging the firing pin into the detonator and initiating
fuze functioning. The relationship between self-destruct time, range, velocity, and spin
decay is shown in figure 2-7. The fuze is rain safe and will not function on impact with grass
or thin brush.
2-27
UNCLASSIFIED
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UNCLASSIFIED
AST-11 60H-001-75
Fuze, PDSD, Model AZZ M594 (XM594)
FOM No. 1390-16-14
(U) Functioning (Continued)
TIME OF FLIGHT
(SECONOSI
SPIN (111/14tH)
7
6
4
2
VELOCITY IM/SI
1"? SELF -DESTRUCT
t-,Vo ile /III
100,000
1000
1055 MIS
???? ,..._
?Y-
-1%
N..?.
REGION
/
/

1
00000
600
57,500 (6/14114)
emo.,....
SPIN (R/MIN)
'AA...
6
et
SELF-OE
ROOT REGION
40000
400
m.....

/
"Cm. .......VEloorr
?I
1
20000
200
GO
, fl) -
CIT
_?11
40,
or-
60.....
44/0.1
....?. Am...,
'AAA...
I
I 0
0
O. 00
0 0.. el. .0.
*t
1?... .0.
00
.0
500
IIIM
littft
20ivi
2000
IN
RANGE MO
Neg. 517006
Original
UPPER LIMIT
IS
AVERAGE VALUE
5 5 S
LOWER LIMIT
46
(UNCLASSIFIED)
Figure 2-7. Fuze, PDSD, Model AZZ M594, performance curves (U).
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
20-mm (20x139-mm) HEI (HELT)
cartridge
20-mm HEI-T cartridge, M599,
with fuze, PDSD, M594
Hispano-Suiza HS-820 series;
Rheinmetall Rh 206
20-mm automatic gun, Model M139
2-28
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UNCLASSIFIED
Original AST-116011-001-75
(U) Description
CO
Ca
Fuze, PD, Model AZ DM 1I1A3
FOM No. 1390-164-91
MV
28,614
34,3
?.-4s" 12 12 UNF 111(38,1)-
49
Figure 2-8. Fuze, PD, Model AZ DM 111A3 (U).
t
ALL DIMENSIONS IN MILLIMETERS
(UNCLASSIFIED)
The AZ DM 111A3 PD fuze (fig 2-8) was developed by Junghans of Vbst Germany for
use with 81-mm and 120-mm mortar projectiles. The fuze thread employed is a 1.5-in
(38-mm) diameter D12 UNF-1A. The AZ DM 111A3 is a setback, delayed-arming type
designed for either super-sensitivity action upon impact or delayed action. It is similar in
design to that of the AZ DM 111 and AZ DM 111A1 fuzes except for a protruded striker
head providing a graze-sensitivity feature.
2-29
UNCLASSIFIED
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UNCLASSIFIED
AST-1160H-001-75
Fuze, PD, Model AZ DM 111A3
FOM No. 1390-16-1-9-1
(U) Unique Features
? Protruding striker head.
? Pull wire providing positive safety during handling.
? Escapement mechanism for delaying or controlling the movement of the
rotor.
? Rotor housing out-of-line SO and delay detonators.
(U) Characteristics
Fuze assembly :
Body material Aluminum
Weight 0.45 lb (204 g)
Markings AZ DM 111A3
Length 87.5 mm (3.44 in)
Thread diam 38.1 mm (1.5 in)
Booster :
Body material Aluminum
Body length 0.81 in (20.6 mm)
Explosive Tetryl
Explosive weight
Body diam 28.6 mm (1.13 in)
Functional data:
Arming method Setback
Firing method Impact
Safety devices
Arming distance 50 m
Arming time 1.01 s
Delay time 0.05 s
*Pull wire, two &tent pins and locking ball, out-of-line detonators.
2-30
UNCLASSIFIED
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Original
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original AST-1160144101-75
Fuze, PD, Model AZ DM 111A3
FOM No. 1390-16-1-9-1
(U) Design Details and Functioning
See technical data sheets FOM No. 1390-16-1-1, Fuze, PD, AZ DM 111 and
FOM No. 1390-16-1-2. For further design details depicting the interface of the firing-pin
assembly, escapement, rotor-selector, stud, and detent system, see section VIII,
Delay-Arming Mechanism, etc.
(U) Applications (Ammunition and Weapons
Ammunition
Weapons
81-mm HE projectiles, 81-mm
smoke (WP) projectiles
120-mm HE projectiles, 120-mm
smoke (WP) projectiles
81-mm mortar
120-mm mortar
2-31
(Reverse Blank)
UNCLASSIFIED
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Kin( PAGE
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UNCLASSIFIED
Original AST-11608-001-75
Fuze, PD, Model AZ DM 221
FOM No. 1390-16-1-13
FIRING PIN
32.7mm
9.6mm
DETONATOR AND BALL
ROTOR ASSEMBLY
BODY ASSEMBLY
ROTOR DETENT
SPRING
BOOSTER
ASSEMBLY
Neg. 517008 (UNCLASSIFIED)
Figure 2-9. Fuze, PD, Model AZ DM 221, section view (U).
(U) Description
Fuze, PD, Model AZ DM 221 (fig 2-9), is a PD fuze with an out-of-line detonator
mounted in a ball rotor. It has no self-destruct mechanism. This fuze is a copy of the
US M505 A-3 fuze; like the latter, it is intended for use in 20x102-mm ammunition.
2-33
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UNCLASSIFIED
AST-1160H-00145 Original
Fuze, PD, Model AZ DM 221
FOM No. 1390-16-1-13
(U) Characteristics
Fuze assembly:
Body material Steel
Weight 21.7 g? (0.048 lb)
Markings AZ DM 221
Booster:
Body material Steel
Body length 32.7 mm (1.29 in)
Explosive HMX
Explosive weight ?04 g (2.5 gr)
Functional data:
Arming method Centrifugal force
Firing method Impact
Safety devices Out-of-line detonator (ball rotor)
Arming distance 6 to 11 m
Arming time
Self-destruct time
Delay time
(U) Functioning
7
Prior to firing, the rotor containing the detonator is locked out of line by the rotor
detent spring. Upon firing, centrifugal force due to projectile rotation causes the spring to
open, allowing the rotor to move in line with the firing pin. The fuze is now armed. The
firing pin is restrained from movement by a thin shoulder. Upon impact, the nose cap is
crushed against the firing pin, forcing the latter against the detonator. The detonator
initiates the booster, which in turn detonates the main explosive charge of the projectile.
There is no self-destruct feature.
2-34
UNCLASSIFIED
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UNCLASSIFIED
Original AST-116011-001-75
Fuze, PD, Model AZ DM 221
FOM No. 1390-16-1-13
(U) Applications (Ammunition and Weapons
Ammunition
Weapons
20x102-mm HE projectile,
Model DM 61
Automatic gun (Vulcan), Model
M 61
2-35
(Reverse Blank)
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FOR OFFICIAL USE ONLY
Original AST-1160H001-75
Fuze, PD, Model AZ DM 51
FOM No. 1390-16-1-15
(FOU0) Description
AZ DM 51 is the West German designation for a copy of US fuze, PD, M48A3. This
fuze is manufactured by Diehl, West Germany, and is standard in the West German Armed
Forces. See Department of Army TM 9-1300-203 for details.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
76x578-mm smoke ("Fog") cartridge,
Model?
90x602-mm smoke ("Fog") cartridge,
Model?
76-mm guns
90-mm guns
(FOUO) Interchangeability
Fuze AZ DM 51 is redesignated fuze AZ DM 211 when utilizing German booster
ZDL DM 42. Fuze AZ DM 51 is redesignated fuze AZ DM 41 when utilizing US booster
M21A4. Fuze AZ DM 51 is redesignated fuze AZ DM 151 when utilizing US booster
M125A1 (German booster ZDL DM 32). Fuze AZ DM 51 is designated fuze AZ DM 241
when a rain safety device and booster ZDL DM 42 are added and the fuze nose portion is
filled with epoxy.
2-37
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FOR OFFICIAL USE ONLY
AST-1160H-001-75 Original
(This page intentionally left blank) (
2-38
FOR OFFICIAL USE ONLY
(This page is UNCLASSIFIED)
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CONFIDENTIAL
Original
AST-1160H-001-75
Fuze, PD, Model Diehl
FOM No. 1390-16-1-16
c
(
(
Neg. 552143
DIEHL PD, FUZE
(CONFIDENTIAL)
Figure 2-10. Fuze, PD, Model Diehl with 106-mm fragmentation projectile (U).
(C) Description
This West German PD fuze (fig 2-10) was developed by Diehl for use with 106-mm
fragmentation projectiles fired from the M40 RCL rifle. It is a setback, delayed-arming fuze
designed for either SQ or delay action upon impact. The fuze is considered detonator safe
for handling, transporting, and air delivery. It is also rainproof and waterproof. It is
expected to function reliably under temperatures from -40 to +60?C.
(U) Unique Features
? Escapement mechanism for delay arming.
? Detent system on firing pin.
? Rotor housing out-of-line explosives detented by two setback pins.
? Graze-functioning feature via booster lead plunger.
2-39
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CONFIDENTIAL
AST-1160H-001-75 Original
Fuze, PD, Model Diehl
FOM No. 1390-16-1-16
(C) Characteristics
Fuze assembly:
Body material
Weight 400 g (0.881 lb)
Markings
Booster:
Body material
Body length
Explosive 7
Explosive weight 15 g (0.033 lb)
Functional data:
Arming method Setback
Firing method impact
Safety devices
Arming distance 100 m
Arming time 2
Delay time 0.6 s
Fuze sensitivity:
Functions reliably on 2-mm dural
or 10-mm pine wood
*Locking balls (2), locking spring, setback pins (2), out-of-line detonators of S&A device.
2-40
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CONFIDENTIAL
Original
Design Detail
A S14 168 H 75
Fu.re, PD Model Di hl
PON f'so 1390-16-1-16
(UNCLASSIFIED)
e 211, Ftiae, PD Model Diehl section view Tia
24 I
CONF DENTIAL
This paue is UNCLASSIFIED)
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CONFIDENTIAL
AST. 6 75
Fuze, PD Model Diehl
FOM No. 139046( 16
(C) Design Derails Continued)
15
Or al
Neg. 515118
tUNCLASS1F1E
Figure 2-12. Fuze, PD, Model Diehl, section view of delay -arming mechanism (U).
The Diehl PD fuze (fig 2-11) is a four-piece construction consisting uf the fuze nose or
top upper fuze body (6), lower fuze body (9), and booster assemblage (17,18),
_pin assembly includes the fir g-pin head pring, and the firing pin
2-42
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CONFIDENTIAL
Original AST-1160144101-75
Fuze, PD, Model Diehl
FOM No. 1390-16-1-16
(C) Design Details (Continued)
The detent system on the firing pin includes two locking balls (3), setback sleeve (4),
its locking spring (5), and setback or pressure spring (7).
The lower fuze body (9) houses the safety and arming (S&A) mechanism (10) and the
setting stud or pin (14). In addition, the lower fuze body has a central hole drilled into it at
the base and is threaded internally to facilitate assembly of the inertial-type booster lead
charge (17), its spring, and the booster (18).
The S&A mechanism (10) (fig 2-12) includes the spring-loaded slider (11) housing the
OV (instantaneous) detonator (12) and the MV (delay) detonator (13). The slider housing is
detented by two setback pins (16) and contains a tooth sector that meshes with the escape
wheel (15) of the escapement.
The upper fuze body (6), which is threaded internally, screws into the fine top (1). An
"0" ring is used to provide a watertight seal.
The lower fuze body (9), which is threaded externally, screws into the base of the
upper fuze body (6). An "0" ring is also used to provide a watertightxeal. The lower fuze
body is threaded internally at its base to facilitate assembly of the booster lead plunger (17)
and booster (18) housing. The lower fuze body is also threaded externally to facilitate
assembly into the 106-mm controlled fragmentation projectile.
2-43
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CONFIDENTIAL
AST-1160H-001-75
Fuze, PD, Model Diehl
FOM No. 1390-16-1-16
(C) Functioning
Neg. 515371
Firing Pin Head
Locking Sall
Locking Sio-mg
Setback 51ery
Pressure Spntv
a:Ousting screw
Firing Pin
Rol
Booster Lead Plunger
Spring
Booster Lead Plunger
Boaster Lead
Boaster Charge
Safe Position
Original
Rotor
Detonator w delay
Detonator ,Wo delay
Setback Pins
Escapement
(UNCLASSIFIED)
Figure 2-13. Fun, PD, Model Diehl, section view of components in safe position (U).
Neg. 515370
ARMED POSITION
WITHOUT DELAY
(UNCLASSIFIED)
Figure 2-14. Fuze, PD, Model Diehl, section view of components in armed position (U).
2-44
CONFIDENTIAL
(This page is UNCLASSIFIED)
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CONFIDENTIAL
Original
(C) Functioning (Continued)
Neg. 515369
AST-1160H-001-75
Fuze, PD, Model Diehl
FOM No. 1390-16-1-16
(UNCLASSIFIED)
Figure 2-15. Fuze, Model Diehl, inertial ignition with delay action (U).
Setting (fig 2-13). The slot in the setting stud is aligned with either the OV or the MV
detonator. After firing, the setting stud will stop rotation of the spring-loaded rotor at the
desired point.
Arming (fig 2-13). On firing, inertia forces the setback sleeve to fall back. In this
position it is locked by the locking spring. The rotor, kept in safe position by the two
setback pins, is released simultaneously, but still kept in safe position by the firing pin. The
locking balls, up to now having locked the firing-pin head sleeve to the fuze top, enter the
space cleared by the setback sleeve. After acceleration has ceased, the compressed pressure
spring expands and moves the locked setback sleeve, the locking balls, and the firing pin
with its screwed-on head forward and out of the fuze top. This movement simultaneously
lifts the firing pin out of its bore in the rotor, releasing it. An escapement delays the
rotation of the spring-loaded rotor, providing delayed arming.
2-45
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CONFIDENTIAL
MT-1160H-001-75 Original
Fuze, PD, Model Diehl
FOM No. 1390-16-1.16
(C) Functioning (Continued)
Impact ignition (fig 2-14). On impact, the firing pin is thrust either into the OV or
into the MV detonator, according to the setting of the fuze.
Graze functioning (fig 2-15). Shoulder impact causes deceleration of the projectile.
Inertia forces the booster lead plunger to fall forward, pushing the detonator towards the
point of the firing pin.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
106-mm FRAC projectile
M40 106-mm RCL rifle
2-46
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original AST-1160H-001-75
Fine, PDSD, Model AZZ DM 31
FOM No. 1390-16-1-20
striker
firing pin spring
arming ball
self-destruct housing
firing pin body
lock segment
retaining ring
arming coil
Neg. 517005 (UNCLASSIFIED)
Figure 2-16. Fuze, PDSD, Model AZZ DM 31, section view (U).
(U) Description
This PDSD fuze (fig 2-16) is similar in design and function to fuze, PDSD, Model
FDPA 1502 (FOM No. 1390-17-1-18). It is obsolete in the Federal Republic of Germany.
Arming is accomplished by means of an arming coil, opening under the influence of
spin, that releases firing-pin lock segments. Mechanical self-destruct occurs when spin has
dropped below a predetermined rate. This fuze does not have an out-of-line detonator.
2-47
UNCLASSIFIED
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PDSD, Model AZZ DM 31
FOM No. 1390-16-1-20
(U) Characteristics
Fuze assembly:
Body material
Weight
Markings AZZ DM 31
Booster:
Body material
Body length
Explosive
Explosive weight
7
7
Functional data:
Arming method Spin
Firing method Impact
Safety devices Arming coil-lock segments
Arming distance 7
Arming time
Self-destruct time
Delay time 7
(U) Functioning
In storage and transport, the firing pin is restrained from contact with the detonator by
several lock segments, held in position by a retaining ring and an arming coil. Upon firing,
setback forces increase the pressure exerted against the lock segments by a shoulder on the
firing-pin body. This pressure prevents the lock segments from moving radially under the
influence of centrifugal force. The lock segments in turn press against the arming coil and
keep the latter from uncoiling. At the same time, centrifugal force opens the retaining ring
so that it lies against the inner wall of the self-destruct housing. As acceleration ceases and
setback pressure is removed, centrifugal force causes the four steel arming balls to move
radially outward against the conical inner lip of the self-destruct housing, lifting the
firing-pin body and further compressing the firing-pin spring. As the firing-pin body is lifted
and pressure on the lock segments is removed, the arming coil is freed. Centrifugal force
causes the arming coil to unwind, permitting the lock segments to move radially, clearing
the shoulder on the Firing-pin body. The time required for the arming coil to open after
setback ceases provides bore and muzzle safety. At this point the fuze is armed.
2-48
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PDSD, Model AZZ DM 31
FOM No. 1390-16-1-20
(U) Functioning (Continued)
Upon striking a target, impact is transmitted through the striker to the firing-pin body,
overcoming the centrifugal force that causes the four steel balls to restrain the firing pin
body. The firing-pin spring thrusts the firing-pin body against the detonator to initiate
detonation.
If the projectile fails to hit a target, centrifugal force weakens as spin drops with time
of flight, until the pressure of the firing-pin spring overcomes the centrifugal force acting on
the four steel balls. At this point, the firing-pin spring drives the firing-pin body against the
detonator to initiate self-destruct.
(U) Applications (Ammunition and Weapons
Ammunition
Weapons
20x139-mm, HEI cartridge,
Model DM 131
Automatic gun, Model Rh-202
2-49
(Reverse Blank)
UNCLASSIFIED
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BLANK PAGE
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UNCLASSIFIED
Original
UPPER BODY
AST-1160H-001-75
Fuze, PDSD, Model AZZ DM 281A1
FOM No. 1390-16-1-21
FIRING PIN SLOT
CLOSING DISC
LOWER BODY
ROTOR DETENT
SPRING
DETONATOR CUP
Neg. 516972
STRIKER
FIRING PIN
FIRING PIN
SPRING
11 1%;:r ? It. Iv
r 4
.g:.>
---zr At4
? ? -
Ain. 4$6
iinuirn/
II
SELF-DESTRUCT
SHUTTER
ARMING COIL
ROTOR
DETONATOR
BOOSTER BODY
BOOSTER
BOOSTER CUP
(UNCLASSIFIED)
Figure 2-17. Fuze, PDSD, Model AZZ DM 281A1,
section view (U).
2-51
UNCLASSIFIED
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UNCLASSIFIED
AST?1160H-001-75 Original
Fuze, PDSD, Model AZZ DM 281A1
FOM No. 1390-16-1-21
(U) Description
The AZZ DM 281A1 (fig 2-17) is a PDSD fuze with out-of-line detonator designed for
20x139-mm HEI cartridges. It is similar in design to fuze, PDSD, Model AZZ DM 131, but
with the addition of a ball rotor and increased muzzle safety.
(U) Characteristics
Standard 20x139-mm fuze, replacing DM 131 series fuzes.
Fuze assembly:
Body material Aluminum alloy anodized
Weight 17.6 g (0.038 lb)
Markings AZZ DM 281A1
Booster:
Body material
Body length
Explosive
Explosive weight
Self-destruct time:
5? barrel twist
6? barrel twist
Self-destruct distance:
5? barrel twist
6? barrel twist
Functional data:
Arming method
Firing method
Safety devices
Arming distance
Arming time 7
Delay time
Cadmium-plated steel
19.0 mm (0.75 in)
Tetryl
035 g (5.4 gr)
2.6?0.5 s
5.8?0.5 s
Over 1500 m
Over 2500 m
Spin
Impact
Out-of-line detonator; arming coil
20 m
7
2-52
UNCLASSIFIED
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UNCLASSIFIED
Original AST-1160H-001-75
Fine, PDSD, Model AZZ DM 281A1
FOM No. 1390-16-1-21
(U) Functioning
During storage and transport, the detonator rotor is held 64? out of line with the firing
pin and booster by a rotor-detent spring, while a spiral retainer surrounded by an arming
coil prevents rearward movement of the firing pin.
Upon firing, centrifugal force acts on the rotor-detent spring to move it out of
engagement with the ball rotor, which rotates until the detonator is aligned with the firing
pin and booster. Centrifugal force also causes the arming coil to open until it lies against the
inner wall of the recess. The spiral retainer also opens under the influence of centrifugal
force, thus removing any restriction on the rearward movement of the firing pin. This occurs
about 20 meters in front of the muzzle. The fuze is now armed.
When the armed fuze impacts a target whoSe resistance equals or exceeds that of 1-mm
dural, the flange of the striker is sheared off, allowing the striker to drive the firing pin into
the-detonator, initiating detonation of the projectile.
If the projectile does not strike a target, self-destruction will occur at a point about
509 meters beyond the maximum tactical range. The mechanical self-destruct mechanism
consists pf a shutter, two pawls, and a pawl spring. In the unarmed state, the shutter
prevents rearward movement of the firing-pin spring seat, against which the ruing-pin spring
presses. The shutter is held in position by the shutter pawl, which is prevented by the
shutter locking pawl from releasing the shutter. Upon firing, centrifugal force acts on both
the shutter locking pawl and the shutter pawl, disengaging the shutter locking pawl from the
shutter pawl, and exerting force on a weight on the shutter pawl, to keep this pawl engaged
with the shutter against the tendency of the pawl spring to move the pawl out of
engagement with the shutter. If impact does not occur within the maximum tactical range,
rotation decays sufficiently for the pawl-spring tension to overcome centrifugal force and
rotate the shutter pawl out of engagement with the shutter. The firing pin spring acting on
the seat forces the shutter aside, plunging the firing pin into the detonator and initiating
fuze functioning. Figure 2-18 shows the self-destruct region when fuzed projectiles are fired
from barrels having a 5? and a 6? rifling pitch.
2-53
UNCLASSIFIED
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UNCLASSIFIED
AST-1160)1001-75
Fuze, PDSD, Model AZZ DM 281A1
FOM No. 1390-16-1-21
(U) Functioning (Continued)
SPIN RATE
ft /MIN)
10I/,000
90,000
50,010
70,000
50,000.?
50,000
Cft
SELFRESTRUCT
REGION ew
so RIFLING 11?
PIM
to:?
Original
TIME OF
FLIGHT (S)
SELFRESTRUCT RIFLING
REGION CII
3
2
Neg. 517012
1000 2000
RANGE (METERS)
Figure 2-18. Fuze, PDSD, Model AZZ DM 281AI ,
self-destruct as a function of range (U).
2-54
UNCLASSIFIED
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(UNCLASSIFIED)
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UNCLASSIFIED
Original AST-116014-001-75
Fuze, PDSD, Model AZZ DM 281A1
FOM No. 1390-16-1-21
(U) Applications (Ammunition and Weapons
Ammunition
Weapons
20x139-mm HET cartridge,
Model DM 131
Automatic gun, Model Rh-202
2-55
(Reverse Blank)
UNCLASSIFIED
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NM PACE
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FOR OFFICIAL USE ONLY
Original AST-1160H-001-75
Fuze, PDSD, Model AZZ DM 121
FOM No. 1390-16-1-23
(FOUO) Description
The West German PDSD fuze, Model AZZ DM 121, is a copy of the Italian fuze, Model
M6, produced by Bombrini-Parodi-Delfino (B.P.D.) of Rome, Italy. This fuze is standard for
use in the West German Armed Forces. Details on this fuze (FOM No. 1390-23-1-6) appear
on page 2-227.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
40x311-mm HEI-T cartridge,
Model (i')
40-mm antiaircraft gun,
Model L/60 (Bofors)
2-57
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AST-116011-001-75 Original
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FOR OFFICIAL USE ONLY
Original AST-1160H-001-75
Fuze, PD, Model AZ DM 21
FOM No. 1390-16-1-24
(FOU0) Description
The AZ DM 21 West German fuze is a copy of the US Navy fuze Mk27/1 discussed in
TM 9-1300-203. The fuzes are identical in design except the detents on the AZ DM 21's
striker have been modified so their movement is parallel to the rotation of the detonator
rotor. This fuze is standard in the West German Armed Forces.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
40-mm liE1-T cartridge, Model?
40-mm antiaircraft gun,
Model L/60 (Bofors)
2-59
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AST-1160H-001-75 Original
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FOR OFFICIAL USE ONLY
Original AST-1160H-001.75
Fuze, PD, Model AZ DM 41
FOM No. 1390-16-1-25
(FOIJO) Description
AZ DM 41 is the West German designation for US fuze, PD, M51A5, whether imported
or manufactured in Germany. It is standard in the West German Armed Forces. For data on
the M51A5 fuze, see US TM 9-1300-203.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
76x578-mm HE cartridge, Model ?;
76x578-mm practice cartridge,
Model ?
76.2x583-mm (Naval) tracer (?)
cartridge, Model ?
90x602-mm HE cartridge, Model ?;
90x602-mm practice cartridge,
Model?
105x373-mm HE cartridge, Model?;
105x373-mm smoke (WP) cartridge,
Model?
155-mm HE projectiles, Model ?
155-mm smoke (WP) projectiles,
Mode!?
175-mm practice projectiles,
Model ?
203-mm HE projectiles, Model ?
76-mm guns
76.2-mm Naval antiaircraft guns
90-mm guns
105-mm guns and howitzers
155-mm howitzers
175-mm gun, Model M107 (US)
203-mm howitzers (US)
2-61
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AST-1160H-001-75 Original
Fuze, PD, Model AZ DM 41
FOM No. 1390-16-1-25
(FOUO) Interchangeability
When reassembled with the West German booster ZDL DM 42, this fuze is designated
AZ DM 211. When used without a booster, this fuze is designated AZ DM 51.
2-62
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Original
FOR OFFICIAL USE ONLY
AST?1160H-001 -75
Fuze, PD, Model AZ DM 211
FOM No. 1390-16-1-26
Neg. 515130 (UNCLASSIFIED)
Figure 2-19. Fuze, PD, Model AZ DM 211,
full view (U).
2-63
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AST-1160H-001-75 Original
Fuze, PD, Model AZ DM 211
FOM No. 1390-16-1-26
(FOUO) Description
Fuze AZ DM 211 (fig 2-19) is a West German-made copy of US fuze M48A3 (German
Model AZ DM 51) with a German-designed booster assembly (Model ZDL DM 42) attached.
Booster ZDL DM 42 employs an escapement mechanism as a safety device to insure delayed
arming. A mechanical switch allows selection of either SQ functioning or 0.05-second delay.
All metal parts used in this fuze appear to be of brass, aluminum, or brass-coated steel.
Manufactured by Diehl, fuze AZ DM 211 was standard in the West German Armed Forces,
at least as late as 1969. For technical details of this fuze (except for the booster), see
pertinent US publications (e.g., TM 9-1300-203). The only information presently available
on booster ZDL DM 42 is whatever can be deduced from the section view of this fuze
shown in figure 2-20.
setting sleeve
delay plunger
Neg. 515120
near
'etonntor
body
dOlay 0:041eb;
booster OM 42, alternative
booster M 125 Al
(UNCLASSIFIED)
Figure 2-20, Fuze, PD, Model AZ DM 211, section view (U).
2-64
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Original AST-1160H-001-75
Fuze, PD, Model AZ DM 211
FOM No. 1390-16-1-26
(FOUO) Applications (Ammunition and Weapons)
Ammunition
Weapons
76x578-mm HE cartridge, Model ?;
76x578-mm practice cartridge,
Model?
76.2x583-mm tracer (?) cartridge,
Model?
90x602-mm HE cartridge, Model ?;
90x602-mm practice cartridge,
Model?
105x373-mm HE cartridge, Model ?
105x373-mm smoke (WP) cartridge,
Model ?
155-mm HE projectile, Model ?;
155-mm smoke (WP) projectile,
Model ?
203-mm HE projectile, Model ?
76-mm guns
76.2-mm Naval antiaircraft gun
90-mm guns
105-mm guns or howitzers
155-mm howitzers
203-mm howitzers
(Definitely not usable in 175-mm
guns)
(FOUO) Interchangeability
(U) Fuze AZ DM 211 is redesignated AZ DM 41 when US booster M21A4 (or a
German copy of M21A4) is used. Fuze AZ DM 211 is redesignated AZ DM 51 when used
without a booster. Fuze AZ DM 211 is redesignated AZ DM 151 when booster ZDL DM 32
(German designation for US booster M125A1) is used.
2-65
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AST-1160H-001-75 Original
Fuze, PD, Model AZ DM 211
FOM No. 1390-16-1-26
(FOUO) Interchangeability (Continued)
(FOUO) Fuze AZ DM 211 is redesignated AZ DM 241 when a rain safety device is
added and the fuze nose portion is filled with epoxy.
2-66
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Original AST-1160H-001-75
Fuze, PD, Model AZ DM 71
FOM No. 1390-16-1-27
(FOUO) Description
The AZ DM 71 is the West German designation for the US fuze, PDCP M78A1. This
fuze was standard in the West German Armed Forces at least as late as 1969. Technical
details on this fuze are covered in US TM 9-1300-203.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
105x373-mm HE ctg., Model ( ?)
155-mm HE projectile, Model (?)
203-mm HE projectile, Model (?)
105-mm guns or howitzers
155-mm howitzers
203-mm howitzers
2-67
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AST-1160H-001 -75 Original
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FOR OFFICIAL USE ONLY
Original AST-1150H-001-75
Fuze, PD, Model AZ DM 151
FOM No. 1390-16-1-28
(FOUO) Description
According to an official West German publication, AZ DM 151 is the West German
designation for US fuze, PD, M557. This fuze, manufactured by Diehl, was standard in the
West German Armed Forces at least as late as 1969. The AZ DM 151 includes booster
ZDL DM 32, a German model number for US booster M125A1, possibly manufactured in
Germany. For technical details on the M557 fuze and the M125A1 booster, refer to US
TM 9-1300-203.
(FOUO) Applications (Ammunition and Weapons)
Ammunition
Weapons
90x602-mm practice cartridge,
Model (?)
105x373-mm HE cartridge,
Model (?); 105x373-mm smoke
(WP) cartridge, Model (?)
155-mm HE projectile, Model (?);
155-mm smoke (WP) projectile,
Model (?)
175-mm practice projectile,
Model (?)
90-mm guns
105-mm guns or howitzers
155-mm howitzers
175-mm guns, Model M107 (US)
(FOUO) Interchangeability
(U) Fuze AZ DM 151 is redesignated AZ DM 41 when US booster M21A4, (or a German
copy of it) is used instead of booster ZDL DM 32. Fuze AZ DM 151 is redesignated
AZ DM 51 when no booster is used. Fuze AZ DM 151 is redesignated AZ DM 211 when
booster ZDL DM 42 is used.
2-69
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'ASI-11e0H-001-75 Original
Fur zPD; Model AZ DM 151
FOM N.6:1390-16-1-28
(FOUO) Interchangeability (Continued)
(Folio) Fuze AZ DM 151 is redesignated AZ DM 241 when booster ZDL DM 42 is
used, the fuze nose is filled with epoxy, and a rain safety device is added.
2-70
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Original AST,1160H401-75
Fuze, PD, Model AZ DM 241
FOM No.-1390-16-1-29
(FOUO) Description
Fuze AZ DM 241 is a PD fuze with either SQ or delay (0.05 seconds) functioning
(selectable). This fuze was designed specifically for use with 175-mm guns.AZ DM 241 is
essentially a US fuze, PD, M572 with a rain safety device and German booster ZDL DM 42.
Booster ZDL DM 42 is apparently designed in Germany, not copied from a foreign design.
ZDL DM 42 employs an escapement mechanism to insure delayed arming. This fuze,
manufactured by Diehl, was standard in the West German Armed Forces at least as late as
1969. Technical details pertinent to the booster mechanism and functioning of the rain
safety device are unknown.
(FOUO) Applications (Ammunition and Weapons)
Ammunition
Weapons
175-mm HE projectile, Model (?)
175-mm guns (US M107)
(U) Interchangeability
Fuze AZ DM 241 uses many components also used in fuzes AZ DM 41, AZ DM 51,
AZ DM 151, and AZ DM 211.
2-71
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AST-11601.1-001-75
Original
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(This page is UNCLASSIFIED)
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FOR OFFICIAL USE ONLY
Original AST-1 1BOH-001-75
Fuze, PDSD, Model AZZ DM 91
FOM No. 1390-16-1-40
(U) Description
AZZ DM 91 is apparently the West German designation for fuze FZ 104 M2, designed
by Bofors of Sweden and produced by a German manufacturer under license to Bofors. The
FZ 104 M2 is a sensitive, reliable fuze with a pyrotechnic self-destruct element and contains
a rain safety device developed by Bofors. For technical details relative to the FZ 104 fuze
(FOM No. 1390-19-1-2) refer to page 2-199.
(U) Characteristics
Functional data:
Arming method Setback and spin
Firing method Impact or pyrotechnic self-destruct
Safety devices Out-of-line detonator
Arming distance 60 m -
Arming time 0.06 s (approx)
Self-destruct time 6.5 to 10.5 s
Delay time 0.1 to 0.2 ms
(FOUO) Status
This fuze was standard in the West German Armed Forces at least as late as 1969.
(FOUO) Applications (Ammunition and Weapons)
Ammunition
Weapons
40 \ 365-mm HEI-T cartridge,
Model SB-LS-Z
40-mm antiaircraft gun,
Model L/70 (Bofors)
2-73
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AST-1160H-001-75
Original
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WILLAbblisitL/
Original
30i9
INCLASSIFIED)
Figure 2-21. Fuze, PI) Model
21/78, lull view (
UNCLASSIF D
4STilfiOHMtjli
Fuze, PH, Model 21/28
FOM No, 1390-174-1
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UNCLASSIFIED
AST-1150H-001-75 Original
Fuze, PD, Model 21/28
FOM No. 1390 17 1-1
(U) Description
The Model 21/28 PD fuze (fig 2-21) was developed by Brandt of France for use in
mortar projectiles. Although considered obsolete, the fuze is included in this manual
because of its design simplicity. The 21/28 is a simple setback-armed fuze designed for
instantaneous action upon impact. The "21" indicates the major thread diameter, while the
"28" of the model number indicates major body diameter of the fuze?both in millimeters.
(U) Characteristics
Fuze assembly:
Body material Brass
Weight
Markings 21/28 B-35
Length overall 87.1 mm (3.43 in)
Max diam 27.9 mm (1.10 in)
Maj thread diam 20.8 mm (0.82 in)
Booster:
Body material Brass
Body length 35.3 mm (1.39 in)
Explosive
Explosive weight 7
Functional data:
Arming method Setback
Firing method Impact
Safety devices
Arming distance 7 m
Arming time 7
*Safety collar, safety spring, and primer locking ball
2-76
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UNCLASSIFIED
Original
(U) Functioning (fig 2-22)
N. 507929
i0
1.10 DIAM
82 DIAM
24 TPI
AST-11601-001-75
Fuze, PD, Model 21/28
FOM No. 1390-17-1-1
ALL DIMENSIONS IN INCHES
(UNCLASSIFIED)
Figure 2-22. Fuze, PD, Model 21/28, section view (U).
Upon firing, setback forces cause the safety collar (5) to move rearward against the
safety spring (8). The primer locking ball (6) is thus released so that it can move outwards
and free the primer holder assembly (7). In flight, the primer holder assembly can move
forward under the influence of creep forces until it contacts the firing-pin spring guide (3).
Movement of the inertial element is restrained by the spring (2).
On impact, the firing pin (1) is pushed rearward, while the inertial element assembly
moves forward. The unrestrained primer holder assembly moves forward relatively more
rapidly than the inertial element and its associated components. As the firing pin enters the
2-77
UNCLASSIFIED
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?
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UNCLASSIFIED
AST-11600-001-75 Original
Fuze, PD, Model 21/28
FOM No. 1390-17-1-1
(U) Functioning (Continued)
primer body cavity, the two primer detent balls (10) are pushed outwards to protrude into
the cavity between the forward lip of the inertial element assembly (4), the firing-pin spring
guide, and the firing pin. This locks the primer assembly to the forward moving inertial
element. The momentum of the entire inertial assembly, rather than only that of the primer
assembly, impales the primer (1) on the firing-pin point. Th6 flash from the primer then
initiates the booster (9).
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
81-mm HE projectiles
81-mm mortars
2-78
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UNCLASSIFIED
Original AST-11608-001-75
Neg. (UNCLASSIFIED)
516923
Figure 2-23. Fuze, PD, Model
V-18-I, full view (U).
(U) Description
Fuze, PD, Model V-18-I
FOM No. 1390-174-2
The French V-18-I PD fuze (fig 2-23) was developed by Hotchkiss-Brandt for use with
mortar projectiles. It is a setback-armed type designed for SQ functioning upon impact.
2-79
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-116011-001-75 Original
Fuze, PD, Model V-18-I
FOM No. 1390-17-1-2
(U) Characteristics
Fuze assembly:
Body material Brass
Weight
Markings V-18-I
Length 4.50 in (114.3 mm)
Maj diam 1.25 in (31.7 mm)
Booster:
Body material Brass
Body length 1.30 in (33 mm)
Explosive
Explosive weight
2
Functional data:
Arming method Setback
Firing method Impact
Safety devices Safety spring, locking ball
Arming distance 10 m
Arming time 7
2-80
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original
(0) Functioning (fig 2-24)
20
4.3
Neg. 516922
1.25 DIAM
.94 OIAM
TPI
10
, AS1'-1160H-001-15
Fuze, PD, Model V-184
FOM No. 1390-17-1-2
(UNCLASSIFIED)
Figure 2-24. Fuze, PD, Model V-18-I, contour and section views (U).
On firing, setback forces cause the setback sleeve or safety collar (5) to move rearward
against the safety spring or setback spring (8). The collar becomes wedged on the tapered
surface at the rear end of the inertial-element assembly (4). The primer locking ball (6) is
thus released so that it can move outwards and free the primer-holder assembly (7). In
flight, the primer-holder assembly can then move forward under the influence of creep
forces until its forward end contacts the firing-pin spring guide (3). Movement of the inertial
element is restrained by the spring (2).
2-81
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H4:101-75 Original
Fuze, PD, Model V-18-I
FOM No. 1390-17-1-2
(U) Functioning (Continued)
On impact the firing pin and striker assembly (1) is pushed rearward, while the inertial
element assembly moves forward. The unrestrained primer-holder assembly moves forward
relatively more rapidly than the inertial element and its associated components. As the firing
pin enters the primer body cavity, the two primer detent balls (10) are pushed outwards to
protrude into the cavity between the forward lip of the inertial element, the firing-pin spring
guide, and the firing pin. This locks the primer assembly to the forward-moving inertial
element. The momentum of the entire inertial assembly, rather than only that of the primer
assembly, impales the primer (11) on the ruing-pin point. The shock wave from the
detonation ignites the booster (9).
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
81-mm HE projectile M32,
81-mm HE projectile M35,
81-mm smoke projectile M32
120-mm HE projectile M44
81-mm mortar, Model 44
120-mm mortar, Models AM49 and
M1951
2-82
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIW
Original
4.0
136
.34
AST-1160H401-75
Fuze, PD, Model V-I9
FOM No. 1390.1T I3
ALL DIMENSIONS IN INCHES
.88 DIAM
.I7S MN FAM
13 TIM
Neg. 516916 (UNCLASSIFIED)
Figure 2-25. Fuze, PD, Model V?19, full and contour views (11).
(Li) Description
The V-19 PD fuze (fig 2-25) was developed by Hotchkiss-Brandt of France for use with
81-mm and 120-mm mortar projectiles. It is a setback, delayed-arming type designed for
either instantaneous or delayed action upon impact. The fuze is considered bore safe as well
as providing muzzle or trajectory safety 45 to 245 meters from the weapon. It takes a force
of 500 g's to arm the fuze.
(U) Unique Features
Employs a detent system on the primer contained in a movable piston-like
assembly.
2-83
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model V-19
FOM No. 1390-17-1-3
(U) Unique Features (Continued)
? Employs a torqued spring-loaded cylinder with a V-shaped channeling that
houses the delay charge.
? The piston assembly detcnts the torqued cylinder that has to rotate 60?
and 120? to line one of the V-channels with the primer flash channel.
(U) Characteristics
Fuze assembly:
Body material Brass
Weight 476.4 g (1.05 lb)
Markings R and I
Length 4.03 in (102.4 mm)
Max body diam 1.88 in (47.8 mm)
Thread diam 1.18 in (30 mm)
TPI 13
Booster:
Explosive type Tetryl
Explosive weight 16.73 g (0.037 lb)
Detonator type Tetryl
Delay charge Black powder
Functional data:
Arming method Setback
Firing method Impact
Safety devices Detent on primer & torqued cylinder
Arming distance 40 to 245 m
Arming time 1 to 1.2s
Delay time 0.05 s
2-84
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNL.LASSItitt)
Original
(U) Design Details
4ST-1160H-001-75
Fuze, PD, Model V-19
FOM No. 1390-17-1-3
Neg. 516914
(UNCLASSIFIED)
Figure 2-26. Fuze, PD, Model V-I9, exploded view (U).
The V-19 (fig 2-26) consists essentially of a nose (3), body (5), and booster (10). The
nose houses the firing-pin assembly (2) and piston assembly (4). The body (5) has a
transverse cavity into which a cylindrical selector (7) with a V-shaped channel housing a
delay charge and its torsion spring (6) is located. It is sealed by the closing disk (8) and a
lock ring (9). The booster (10) with the detonator located above is placed in the base of the
fuze body 1,5). The closing cup (11) retains the booster, sealing it in place.
2-85
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75
Fuze, PD, Model V-19
FOM No. 1390-17-1-3
(U) Functioning (fig 2-27)
Original
1
PISTON ASSEMBLY
INSTANTANEOUS
Neg. 516918
DELAYED ACTION
Figure 2-27. Fuze, PD, Model V-19, section view (U).
(UNCLASSIFIED)
Prior to firing, the setting stud is turned to either delay or instantaneous mode. The
setting is provided by the eccentric pin of the cylinder (8), which is stopped by the stud
when the fuze is armed. See instantaneous, delayed action, and safe position of the cylinder
(8) illustrated in figure 2-27. The cylinder (8) is torqued by its torsion spring (5).
The arming mechanism of the piston assembly (3) is located in the nose portion (2) of
the fuze. Arming of the fuze occurs as follows: Within the piston sleeve (c) is a setback
2-86
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PD, Model V-19
FOM No. 1390-17-1-3
(U) Functioning (Continued)
spring (f) which holds a brass safety sleeve (d) away from a brass plug (h). This prevents two
steel locking balls (e) from moving outward and disengaging the primer housing (b). A
locking sleeve (g), containing four prongs near its base, engages the safety sleeve (d) when
setback force, resulting from the firing of the weapon, causes the locking sleeve to compress
the spring. With the removal of the balls, the piston spring (k), assembled under
compression, expands forcing the piston (c) to move forward toward the firing pin. Upon
impact with the target, the firing pin (1) is driven downward against the primer(m) at the
same time set-forward force moves the primer holder (g) towards the firing pin, causing the
charge to initiate. The resultant flash is directed through a flash tube (j) into the charges of
the selector cylinder (8).
The selector cylinder (8), locked in the safe condition by the flash tube (j), serves in
this position as an obturator. When the flash tube is withdrawn from the selector cylinder
by the rising of the piston as described above, it is free to be positioned by means of the
setting stud (4) and the action of the torsion spring (5) to produce either instantaneous "I"
or delay "R" action of the fuze.
The instantaneous or delayed action is thus controlled as follows: When in the "safe"
position, the selector is locked from rotating by the flash tube. In this condition, a red dot
can be seen through the transparent closing disk at the lower extremity of its vertical
diameter. This will coincide with a red index on the lower fuze body.
In the instantaneous action condition, the setting stud (4) is turned so that the torsion
spring, one end of which is imbedded in the selector cylinder, rotates the cylinder until a
passage is aligned with the flash tube to cause functioning of the relay into a detonator
imbedded in the web of the lower fuze body directly over the booster cavity. Positioning
the setting plug for delayed action (R) permits the selector cylinder to revolve until the flash
tube directs the primer gases into a delay charge followed by a relay charge (6) before
initiating a tetryl detonator pellet. Action of this pellet then functions the booster charge
(7).
2-87
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-11601110145 Original
Fuze, PD, Model V-19
FOM No. 1390-17-1-3
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
81-mm HE projectiles,
Models M57 and M59
120-mm HE projectiles,
Models PUPA ED
PEPA L-P and 1944
81-mm Brandt mortar,
Model 1944
120-mm Brandt mortars, both lightweight
and heavyweight models
2-88
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original
AST-11608-001-75
Fuze, PD, Model SC-12
FOM No. 1390-17-14
Neg. 515145 (UNCLASSIFIED)
Figure 2-28. Fun, PD, Model SC-12, section view (U).
i
2-89
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160/1-001-75
Fuze, PD, Model SC-12
FOM No. 1390-17-1-4
(U) Description
Original
The French SC-12 PD fuze (fig 2-28) is a setback, delayed-arming-type design for a
long or short delay, depending on the setting. It was developed by Societe Nouvelle
d'Etudes et de Mechanique (SNEM) of Romainville, France, for use on 60-mm mortar
projectiles. The fuze has been sealed to assure waterproofness and tightness of assemblage.
(U) Unique Features
? Clockwork mechanism for controlling the delayed arming.
? Rotatable cap for positioning the rack (i.e., slider).
? An inertial lock or setback device for detenting the balance wheel of the
clockwork mechanism coupled to the rack or slider.
(U) Characteristics
Fuze assembly:
Body material
Weight
Markings
Length
Booster:
Body material
Body length
Explosive
148 g (0.326 lb)
SC-12
72 mm (2.83 in)
7
Explosive weight
Functional data:
Arming method
Firing method
Safety devices
Arming distance
Arming time
Delay time
Setback; clockwork mechanism
Impact
Inertial lock*
7
7
*The inertial lock detents the balance wheel. The cap or nose portion of the fuze can be moved by band to the secure
position setting. This moves the rack or slider between the two spring-loaded knobs as illustrated in figure 2-29
2-90
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original
(U) Characteristics (Continued)
Inertia-lock in high position
locking the clock-work
Inertia lock
locket *1
AST-1160H-001-75
Fuze, PD, Model SC-12
FOM No. 1390-17.1-4
Drivm finger
Rack not in line
Inertia-lock locking
the clock-work
Neg. 515143
Reck is between
2 driving knobs
C?
(UNCLASSIFIED)
Figure 2-29. Fuze, PD, Model SC-12, section view
depicting components in safe position (U).
2-91
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001 -75 Original
Fuze, PD, Model SC-12
FOM No. 1390-17-1-4
(U) Design Details
The SC-12 fuze consists of a cap (i.e., nose portion), fuze body, and booster
assemblage.
The nose portion is bored out to facilitate assembly of the firing-pin assembly and the
escapement mechanism. The firing-pin assembly includes the striker head, coil spring, and
firing pin. An "0" ring seals the striker head, assuring tightness between striker head and
forward portion of the nose.
The clockwork mechanism includes the driving gears, balance wheel, and pinion (called
a driving finger by SNEM) that engages the rack or slider that houses an out-of-line
primer-detonator.
The balance wheel is detented by a setback device that includes an inertial lock
coupled to a setback spring and a locking finger (i.e., setback pin) with another setback
spring. A driving finger is fixed to the cap and coupled to the gearing of the clockwork
mechanism which controls the movement of the rack or slider.
The fuze body, which is fitted to the nose portion or cap, is sealed by an "0" ring to
assure tightness of assemblage.
The nose portion or cap can be rotated by hand to three different settings. These are
"TC" for short trajectory security, "S" for security position, and "TL" for long trajectory
security. The marks or lines on the cap portion are aligned with a scribe mark on the fuze
body. When the setting is on "S," the rack (i.e., slider) is rotated so it is between two
spring-driven knobs located 90? apart.
The lower portion of the fuze body is counterbored and threaded internally to
facilitate assembly of the relay and booster cups.
(U) Functioning
Prior to Firing, the cap is rotated by hand to either the short (TC) or long (TL) delay
arming setting. This brings the rack or slider opposite to one of two spring-loaded knobs, as
illustrated in figure 2-30,
2-92
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original AST-1160H-001-75
(U) Functioning (Continued)
Inertia-lock is
freed but remains
In position
Fuze, PD, Model SC-12
FOM No. 1390-17-1-4
Rack in the axis
of driving spring
Neg. 515146
(UNCLASSIFIED)
Figure 2-30. Fuze, PD, Model SC-12, section view
depicting delay-arming selection (U).
2-93
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75
Fuze, PD, Model SC-12
FOM No. 1390-17-1-4
(U) Functioning (Continued)
Original
Upon firing, setback forces moves the inertial lock and locking pin rearward,
compressing their springs as illustrated in figure 2-31. The inertial-lock is kept locked on
setback by its locking finger. With the balance wheel released, the clockwork now functions
along with the spring-loaded knobs, which moves the rack, delayed only by the clockwork,
dependent on setting. After the prescribed delay time, the primer-detonator lines up with
the firing pin, as illustrated in figure 2-32. The fuze is now armed.
Inertia?lock
lowered and locked
Balance wheel free
(clockwork may function)
Neg. 515142 (UNCLASSIFIED)
Figure 2-31. Fuze, PD, Model SC-12, section view
depicting inertial lock in rearward position (U).
2-94
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UNCLASSIFIED
Original
(U) Functioning (Continued)
AST-1160H-001-75
Fuze, PD, Model SC-12
FOM No. 1390-17-14
The rack primer is in
line with the other
arts of fire line
Neg. 515141 (UNCLASSIFIED)
Figure 2-32. Fuze, PD, Model SC-12, section view
depicting fuze in armed position (U).
2-95
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-11 50H-001-75
Fuze, PD, Model SC-12
FOM No. 1390-17-1-4
(U) Functioning (Continued)
Original
Upon impact, setback moves the striker head rearward, compressing its spring and
allowing the firing pin to stab the primer (as illustrated in figure 2-33). This in turn ignites
the relay and booster, resulting in instantaneous detonation of the projectile.
The firing pin
hits first primer
Neg. 515139
(UNCLASSIFIED)
Figure 2-33. Fuze, PD, Model SC-12, section view
depicting firing pin action upon impact (U).
2-96
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original
(U) Functioning (Continued)
AST-11600-001-75
Fuze, PD, Model SC-12
FOM No. 1390-17-14
If the projectile grazes the ground upon impact, the primer-detonator moves forward
through inertia, striking the firing pin (as illustrated in fig 2-34) and instantaneously
detonating the projectile.
Neg. 515140
(UNCLASSIFIED)
Figure 2-34. Fuze, Pi), Model SC-12, section view
depicting action upon graze impact (U).
2-97
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001 -75 Original
Fuze, PD, Model SC-12
FOM No. 1390-17-1-4
(U) Applications (Ammunition and Weapons
Ammunition
Weapons
60-mm HE projectile, Model FA-MK 47
60-mm mortars, Model 1961
2-98
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
ASTi6QHOO1J5
I'D Model FULF2
390-17.1-11.
ALL IMENSONS N MILliMeTERS
LINE
AM
BS PITCH 2
IAM
A
CLASSIFIED)
235 Fuze PD, Model FUI-F2, dimensioned cutaway view (U).
2-99
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model FUI-F2
FOM No. 1390-17-1-11
(U) Description
The FUI-F2 (fig 2-35) is a setback-armed PD fuze designed for use on fin-stabilized
projectiles with a slow spin. It is restricted to use on projectiles having a spin rate of less
than 50 r/s. The FUI-F2 is designed for graze functioning at angles of 10 to 11/2?, regardless
of terrain.
(U) Unique Features
? Employs a conical-shaped block permitting an all-ways acting canning
action for graze functioning.
? Also features a torqued-spring rotor housing an out-of-line detonator
which is detented by a locking ball and setback device.
(U) Characteristics
Fuze assembly:
Body material 7
Weight 530 g (1.17 lb)
Markings FUI-F2
Booster:
Body material
Body length 28 inm (1.10 in)
Explosive
Explosive weight 7
Functional data:
Arming method Setback
Firing method Impact
Safety devices
Arming distance 6 ni
Arming time
*Detcnt (two-locking balls) on prinwr-holder and detent (loaking ball) on rotor .1 hi y
2-100
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original AS7-1160H-001-75
Fuze, PD, Model FUI-F2
FOM No. 1390-17-1-11
(U) Design Details
`..GLOSURE DISC
FIRING PN SPRING
FIRING PIN
'SOCKET
'FUZE NOSE
;PRIMER HOLDER GUIDE
ROTOR
FUZE BODY
TORQUED SPRING
;SETBACK SLEEVE
;SETBACK SPRING
,DETENT BALL(S)
PRIIMER HOLDER
Neg. 516543
SPLIT COLLAR
ONICAL SHAPED BLOCK
,SETBACK CUP
SETBACK CUP SPRING
ENTRAL TUBE
FIXED PIN
'RELAY
BOOSTER ASSEMBLY
BOOSTER
(UNCLASSIFIED)
Figure 2-36. Fuze, PD, Model FUI-F2, cutaway with components (U).
The FUI-F2 fuze (fig 2-36) consists of a nose, body, and booster assemblage. The nose
portion of the fuze is sealed by a closure disk providing rain safety. It contains the firing-pin
and primer assemblies. The firing-pin assembly consists of the firing pin, its spring, and a
socket that plugs into the primer-holder guide of the primer assembly. This assembly
includes the primer-holder guide, primer holder, primer, central tube, and split collar.
2-101
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model FUI-F2
FOM No. 1390-17-1 II
(U) Design Details (Continued)
The primer-holder guide and primer holder are recessed to hold two locking balls that
provide a detent on the primer. The two locking balls are held in place by a setback sleeve
and spring. The nose portion of the fuze is threaded externally. Pationed internally at this
threaded area is a conical-shaped block for mating with the conical-shaped head of the
primer-holder guide, providing an always acting camming action.
The fuze body, which screws on to the externally threaded nose portion, houses a
torqued spring rotor containing the out-of-line detonator. The rotor is detented by a locking
ball held in place by a setback device consisting of the setback cup, setback spring, and fixed
pin.
Beneath the central tube is a pentrite relay positioned over the booster. The booster
assembly is then screwed onto the fuze body, completing the fuze assembly.
(U) Functioning (fig 2-37)
Upon firing, the setback sleeve (1) moves its spring (2) rearward, freeing the two
locking balls (3) which fall into the cavity (4) of the nose portion of the fuze.
Simultaneously, the firing pin (10) moves against its spring (11) while the setback cup (5)
moves rearward against its spring, releasing the locking ball (7) undetenting the rotor (8).
The rotor, by virtue of its spring, now moves the detonator in line, arming the fuze.
Upon dissipation of setback forces, the primer holder (9) and firing pin (10) move
forward against a closure disk by expansion of springs (2 and 11).
Upon impact, the firing pin (10) stabs the primer (12) which flashes through the
central tube (13) to the detonator which in turn ignites relay (14), setting off the booster
(15), resulting in the detonation of the high explosive filler of the projectile.
If the projectile strikes at angles of 10 to 1.5?, grazing functioning is provided by the
all-way camming action provided by the conical-shaped block (16).
Figure 2-38 depicts component movement during firing, in the armed position, and
upon graze functioning.
2-102
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UNCLASSIFIED
Original
Functioning C n ued)
AST-1160H-001-75
Fuze, PO, Model ['Ur-F-2
FOM No.139017141
17
2
eg. 5Ui54I (UNCLASSIFIED)
Figure 2-37, Fu2c, PD, Model FUI-F2, section
2403
UNCLASSIFIED
VI
U).
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75
Fuze, PD, Model FU!-F2
FOM No. 1390-17-1-11
(U) Functioning (Continued)
DURING FIRING
Neg. 516542
Original
ARMED POSITION GRAZE FUNCTIONING
(UNCLASSIFIED)
Figure 2-38. Fuze, PD, Model FUI-F2, functioning views (U).
2-104
UNCLASSIFIED
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,
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UNCLASSIFIED
Original AST-1160H4101-75
Fuze, PD, Model FUI-F2
FOM No. 1390-17-1-11
(U) Applications (Ammunition arid Weapons)
Ammunition
Weapons
90-mm HE projectiles, Model
0E-90-F1
90-mm gun, Model CN-90-61,
on ELC Even LT tank and modified
AML Panhard
2-105
(Reverse Blank)
UNCLASSIFIED
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BLANK PAGE
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UNCLASSIFIED
Onginal
AST-1160H-001-75
Fuze, PD, Model V 5
FOM No. 1390-17-1-12
Neg. 515166
(UNCLASSIFIED)
Figure 2-39. Fuze, PD, Model V-5, section view (U).
2-107
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model V-5
FOM No, 1390-17-1-12
(U) Description
The V-5 PD fuze (fig 2-39) is a setback, delayed-arming type designed for either
instantaneous or delay action upon impact. The fuze was developed by Societe Nouvelle
d'Etudes et de Mecanique (SNEM) for use with 81-mm and 120-mm mortar projectiles. It
was designed to meet NATO specifications to assure total security against double-loading
dangers and premature explosions within a minimum distance of 50 meters from the muzzle
of the weapon.
(U) Unique Features
? Employs out-of-line primers and detonator.
? Employs detents on firing pin and balance wheel of clockwork
mechanism.
? Employs clockwork for delayed arming of fuze.
? Employs a cap (i.e., upper fuze body) coupled to a driving pin for
selection of either instantaneous or delay action mode.
? Employs a rubber shock absorber.
(U) Characteristics
Fuze assembly:
Body material
Weight
Markings
Booster:
Body material
Body length
Explosive
Explosive weight
2-108
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PD, Model V-5
FOM No. 1390-17-1-12
(U) Characteristics (Continued)
Functional data:
Arming method setback
Firing method Impact
Safety devices *
Arming distance 50 m
Arming time 1.00 s
Delay time 0.05 s
(U) Design Details
The V-5 fuze (fig 2-39) consists of movable cap (i.e., upper fuze body), a lower fuze
body, and a booster assemblage.
The movable cap (20) is bored out to house the firing-pin assembly consisting of the
striker cup (1), striker head (2), coil spring (18), and the firing pin (19). The firing-pin guide
or flange (21) is locked in place by a snap ring (4). A driving pin (22) is fastened to the
flange and fits into a slot cut into the primer drum (24), which is in an offset position from
the fixing pin. The primer drum (24) houses the instantaneous and delay primers (A), which
are in the out-of-line position when the arrow on the movable cap or upper fuze body (20)
is aligned with the letter "S" located on the lower fuze body (32). When the arrow lines up
with the letter "R" on the lower fuze body, the delay primer (A) is positioned directly
beneath the firing pin (19). When the arrow lines up with the letter "I," the instantaneous
primer lines up with the firing pin and the central tube (29).
The forward portion of the upper fuze body or cap (20) is sealed by an "0" ring (3).
At the internal shoulder where the striker cap (1) seats, an external portion of the cap (20)
is cut out to facilitate assembly of a rubber shock absorber (17) to dampen the effect of the
fuze upon impact.
A set screw (8), ring (23), and 0-ring (25) assure tightness of the assembly of the lower
fuze body (32) to the upper fuze body or cap (20).
*Two detent balls and inertial lock de tenting balance wheel and a detent ball and lever detenting firing pin.
2-109
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model V-5
FOM No. 1390.17-1-12
(U) Design Details (Continued)
The detent on the firing pin (19) consists of a lever (5), piyotable lever pin (9), lever
spring (7), and a lock ball (6). The detent on the balance wheel (28) of the clockwork
mechanism (30) mounted on plate (26) consists of two lock balls (10), an inertial lock pin
(11), and a setback spring (14) contained in a spring housing (15).
The lower fuze body has two openings cut transversally, one to house the spring plug
(12), rack (i.e., slider) spring (13), and the other for insertion of an inspection plug (27).
The rack or slider (31) houses the detonator "B," which is kept in the out-of-line position
until the fuze is armed.
The booster assembly (16) containing the booster "D" located beneath the relay
charge "C" is fitted to the lower fuze body completing the assemblage.
Design details of the clockwork mechanism and its interface with other fuze
components are illustrated in figure 2-40. The clockwork consists of a main wheel or gear
(35), an escapement wheel (36), the balance wheel (28), the clockwork frame (30), and
mounting plate (26).
2-110
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UNCLASSIFIED
Original
(U) Design Details (Continued)
AST-1160H-001-75
Fine, PD, Model V-5
FOM No. 1390-17-1-12
SAFETY POSTION
INSTANTANEOUS POSITION
Neg. 515163
TIME DELAY
(UNCLASSIFIED)
Figure 2-40. Fuze, PD, Model V-5, details of clockwork (U).
2-111
UNCLASSIFIED
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UNCLASSIFIED
AST-1 TOOR-001-75
Fuze, PD, Model V.5
FOM No. 1390-17-1-12
(U) Design Details (Continued)
Original
Design details of the rack or slider (31) housing the detonator in the armed and
unarmed position are illustrated in figure 2-41. The rack (31) interfaces with the clockwork
(30). The spring-loaded slider consists of the spring plug (12) and spring (13).
rack before cocking
rack after cocking mechan.sm h?s opefated,
Neg. 515164 (UNCLASSIFIED)
Figure 2-41. Fuze, PD, Model V-5, details of rack (U).
2-112
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original
AST-116011-001-75
Fuze, PD, Model V-5
FOM No. 1390-17-1-12
(U) Design Details (Continued)
Design details of primer drum (24) and its interface with other fuze components are
illustrated in figure 2-42. This view depicts the safety, instantaneous, and delay positions of
the primers.
Neg. 516919 (UNCLASSIFIED)
Figure 2-42. Fuze, PD, Model V-5, details of primer drum (U).
2-113
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UNCLASSIFIED
AST-1160H-001-75
Fuze, PD, Model V-5
FONT No. 1390-17-1-12
(U) Functioning (fig 2-43)
BALANCE WHEEL BLOCKED BY INERTIAL LOCK PIN
BALL RETAINING THE INERTIAL LOCK PIN
SPRING UNDER TENSION
FIRING PIN LEVER LOCKED
Original
BALANCE WHEEL
FREE TO MOVE
BALLS FREEING THE INERTIAL
LOCK PIN
SPRING TENSION RELEASED,
INERTIAL LOCK PIN RESTRAINED
FIRING PIN LEVER RELEASED
Neg. 515165
SAFETY POSITION
COCKED POSITION
Figure 2-43. Fuze, PD, Model V-5, section view,
armed and unarmed positions (U).
2-114
UNCLASSIFIED
(UNCLASSIFIED)
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UNCLASSIFIED
Original AST-11601140145
Fuze, PD, Model V.5
FOM No. 1390-17-1-12
(U) Functioning (Continued)
In the safety position no functioning parts can move, all parts being locked or
detented. The detent on the firing pin is provided by a firing-pin lever (5), a lock ball, and a
pivot pin. The detent on the balance wheel (28) is locked by two balls (10), a setback
inertial-lock pin (11), and a setback spring (14). This detent is then put under tension by the
lever spring (7).
For delay or instantaneous action, the movable cap is rotated to either the "R" or the
"I" setting on the lower fuze body. This moves the delay or the instantaneous primer in line
with the firing pin.
Upon firing, setback forces the inertial lock (11) rearward against its spring (14),
releasing the lock ball (10). Instantaneously the firing-pin lock ball is released, allowing the
lever (5) to pivot on its pin freeing the firing pin. The inertial lock is prevented from moving
forward by lever spring (7).
Upon impact, the firing pin stabs the primer, initiating the detonator and in turn the
relay charge and booster (16), resulting in the detonation of the high explosive charge of the
projectile.
If the projectile grazes the ground, the primer drum (24) moves forward and the primer
stabs the firing pin, resulting in initiation of the explosive train as indicated above.
(U) Applications (Ammunition and Weapons
Ammunition
Weapons
81-mm HE projectiles
120-mm HE projectiles
81-mm mortars
120-mm mortars
2-115
(Reverse Blank)
UNCLASSIFIED
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UNLLASSINEV
AS74160H410145
h I lie, PD, Model V19-P
FOM No. 1.390171-17
:NO
5144
44 Fuze PD, Model V-19-P, full vie
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model V -19-P
FOM No. 1390-I 7-1-17
(U) Description
The V-19-P fuze (fig 2-44) is an improved version of the V-19 fuze
(FOM No. 1390-17-1-3). Like the V-19, it is a setback, delayed-arming type intended for use
with fin-stabilized 81-mm and 120-mm mortar projectiles. It is designed to assure bore
safety and muzzle safety as well as to withstand parachute delivery.
(U) Unique Features
? Movable nose to permit setting of fuze from safe to fire position.
? The use of locking plate pinned to the nose of the fuze for detenting the
setback sleeve when fuze is set in a safe position.
? Unique piston assembly which detents a torqued cylinder housing an
out-of-line detonator.
(U) Characteristics
Fuze assembly:
Body material Brass*
Weight 390 g (0.86 lb)
Markings T S
R 1
Booster:
Body material Aluminum
Body length
Explosive Tetryl
Explosive weight 16.23 g (0.036 lb)
?Another model, the V-19-ra, is manufactured with a light aluminum alloy body instead of brass, reducing the weight to
200 gra nis (0.44 lb) This version is intended for 8i-mm projectiles only.
2-118
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UNCLASSIFIED
Original AST-11608-001-75
(U) Characteristics (Continued)
Functional data:
Arming method Setback
Firing method Impact
Safety devices *
Arming distance 50 to 250 m
Arming time 1 to 2 $
Delay time 0.05 $
(U) Design Details
1
2
3
4
5
6
7
8'
9
?10
Fuze, PD, Model V-19-P
FOM No. 1390-17-1-17
Neg. 515148
17
18
19
(UNCLASSIFIED)
Figure 2-45. Fuze, PD, Model V-19-P, section view, safe position (U).
*Two detent balls, detenting piston assembly having a central tube that detents cylinder housing out-of-line detonator,
and a safety locking plate detenting the locking bans.
2-119
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UNCLASSIFIED
AST-116011-001-75 Original
Fuze, PD, Model V-19-P
FOM No. 1390-17-1-17
(U) Design Details (Continued)
The fuze (fig 2-45) consists of a movable nose (4), brass fuze body (18), and booster
(19) assembly.
The movable nose (4) is bored out to house the firing pin and unique piston assembly
(5). The firing-pin assembly includes a firing-pin cup (1), its spring (2), a nail-like firing pin
(3), and a flange that acts as a seat for the spring (2). The assembly is sealed by an "0" ring
to assure tightness of assemblage.
Fitted into the rear of the nose is the piston assembly (5) which houses the primer (6)
positioned in a central flash tube that locks the cylinder (17) to prevent its moving.
The detent system on the piston (5) includes two metal balls (9) held in place by a
setback sleeve (7), a setback spring (10), and a locking plate (13) pinned to the movable
nose which has a slot for camming the plate under the setback sleeve (7). This happens when
the fuze nose is turned by hand to the safe position. The locking plate detents the sleeve (7)
and precludes movement of the detent balls, (10) assuring safe delivery by parachute drop.
Additionally, a safety retainer ring (12) with four prongs is positioned under the sleeve (7)
and held in place by the setback spring (10). Upon setback during firing, the ring (12)
latches onto the sleeve (7) and prevents the spring (10), which is compressed, from
expanding when setback forces are dissipated. This allows the piston (5) housing the primer
to move forward towards the firing pin (3) by expansion of a spring (11) assembled in a
compressed state. This simultaneously moves the central tube forward undetenting or
releasing the torqued cylinder (17).
The brass fuze body (18) is fitted to the movable nose (4) by a retaining ring (8).
A hole transversally cut through the fuze body (18) houses the cylinder (17) which has
an eccentric pin or stud. ,
The cylinder also has two bored holes forming a "V." In one of the legs there is a delay
charge (21); the other leg is empty. Both legs terminate on the detonator (20). The cylinder
assembled under torsion by a spring (16) is retained by a stop (14) and a transparent
selector (15). The selector with its stop can be turned to either instantaneous (I) or delay
action (R) by the eccentric pin of the cylinder (17).
2-120
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UNLLASSWiEU
Original
(U) Design Details (Continued)
4511160H4:101-15
Fuze. PD, Model 17-19.P
FON No, 1390-17t17
Directly beneath the cylinder are two openings drilled through the base of the fuze
body for housing two tetryl relays (22). In addition, the interior of the fuze body is bored
and threaded to facilitate assembly of the tetryl booster pellet (19) which is sealed by a
closing cup.
The exterior of the rear portion of the fuze body (18) is threaded for assembling into
either an SI-trim or 120-mm mortar projectile.
(U) Functioning
Ne 515150
(UNCLASSIFIED)
Figure 2-46. Fuze, PD, Model V-19-P, section view depicting setback action (U).
2 121
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model V-19-P
FOM No. 1390-17-1-17
(U) Functioning (Continued)
Prior to functioning (fig 2-46), the selector (15) is moved to either the instantaneous
(I) or delay (R) mode of functioning. The movable nose is placed in the "1' position,
indicating ready for firing.
Upon firing, setback causes the setback sleeve (7) to move rearward compressing its
spring and the sleeve is locked in place by four prongs of the safety retainer ring (12).
Simultaneously, the piston (5) housing these components moves rearward, further
compressing the spring (11). The detent ball (9) now moves out into a cavity of the piston
assembly (5). This releases the piston containing the primer and central tube which is
pushed toward the firing pin by expansion of a spring (11) when setback forces dissipate.
The central tube detenting the cylinder is moved forward, undetenting the torqued cylinder.
When the piston has stopped moving forward, the cylinder (fig 2-47) is released and rotates
600 or 120?, depending on the position of the selector (15) which rests against the eccentric
pin of the cylinder. The fuze is now armed. (See both delayed and instantaneous positions
of the cylinder.)
Neg. 515149
(UNCLASSIFIED)
Figure 2-47. Fuze, PD, Model V-19-P, section view
depicting components in armed position (U).
2-122
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UNLIAbbitlti)
AST,11 -001-75
Fuze, PD, Model V19P
FOM N0.1390-1
Functioning (Co
In ?the armed position, the firing pin enters? the as tube directly above the
(6). Upon Impact (fig 2-48), the firing-pin cup compresses a spring (2) while the
piston. (5) is flung forward, The point of the firing pin stabs the primer which flashes
through the central tube, one of the legs of the V the cylinder, depending on the setting,
If set for instantaneous, it. flashes through the %/beg housing the instantaneous charge,
ting the detonator whieh in turn is relayed by charge (4resulting in the detonator of
booster (i9),
Neg. 515147
'NCLASSIF1ED1
Figure 2-48. Fun, PD, Model V-19-P section view depicting
firing-pin and lucking-plate camming action (U)
2-123
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
, AST-1160H-001-75 Original
Fine, PD, Model V-19-P
FOM No. 1390-17-1-17
(U) Functioning (Continued)
If set for delay, it flashes through the V-leg housing the delay charge, which burns for
0.05-second delay, then initiates the detonator and in turn the relay charge and booster.
The camming of the locking plate with the fuze nose in the safe position is shown in
figure 2-48. The locking plate is positioned under the setback sleeve and precludes
movement of the metal balls, making the fuze safe for dropping by parachute.
When in the fire position, the locking plate is cammed away from the setback sleeve,
which now allows the sleeve to lock onto the four prongs of the safety retainer ring,
releasing the balls.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
81-mm projectiles
120-mm projectiles
81-mm Brandt mortar
120-mm Brandt mortar
1-114
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UNCLASSIFIED
Original
Neg. 517009
AST-1160H-001-75
Fuze, PDSD, Model FDPA 1502
FOM No. 1390-17-1-18
1. Lower body (aluminum alloy)
2. Armmg coil (annealed brass)
3. Self-destruct housing (steel)
4. Firing pin body (aluminum alloy)
5. Firing pin (stainless steel) ?
6. Self-destruct balls (6) (steel) '
7. Firing pm spring (spring steel)
8. Closing disk (aluminum alloys)
9. Upper body (aluminum alloy).
10. Conical surface of self-destruct housing
11. Lock pin (steel)
12. Closing washer (cardboard)
13, Primer
14. Primer holder (aluminum alloy)
15. Closing washer (cardboard)
16. Delay detonator
17,, 18., 19., 20., and 21. Flash channels in
primer holder providing delay in fuze functioning
(UNCLASSIFIED)
Figure 2-49. Fuze, PDSD, Model FDPA 1502, section view (U).
(U) Description
The French PDSD fuze FDPA 1502 (fig 2-49) is designed for 30x97-mm ammunition
for automatic aircraft cannon, Types 3 CCF and DEFA 540 and 541. The fuze does not
have an out-of-line detonator.
2-125
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PDSD, Model FDPA 1502
FOM No. 1390-17-1-18
(U) Characteristics
Fuze assembly:
Body material Aluminum alloy
Weight
Markings
Booster:
Body material 7
Body length
Explosive Hexal 85/15
Explosive weight
Functional data:
Arming method Spin
Firing method Impact
Safety devices Arming coil
Arming distance 7
Arming time 7
Self-destruct time 0.05 s
Delay time
(U) Functioning
This fuze is similar in design and function to the West German fuze, PDSD, Model
AZZ DM 31. In storage and transport, the firing-pin body is restrained from contact with
the detonator by an arming coil. Upon firing, setback forces acting on the closing disk and
firing-pin spring press the firing-pin body against the arming coil, preventing it from
uncoiling. As acceleration ceases and setback pressure is removed, centrifugal force moves
the six steel balls radially outward against the conical surface of the self-destruct housing,
raising the firing-pin body against the pressure of the firing-pin spring. Released from
restraint, the arming coil unwinds until it lies against the inner wall of the lower body. The
time required for the arming coil to unwind after setback ends provides bore and muzzle
safety. At this point the fuze is armed.
Upon striking a target, impact on the closing disk is transmitted through the firing-pin
spring, increasing the pressure against the firing-pin body and overcoming the centrifugal
2-126
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PDSD, Model FDPA 1502
FOM No. 1390-17-1-18
(U) Functioning (Continued)
force that causes the six steel balls to restrain the firing pin, until the firing-pin spring forces
the firing-pin body against the primer to initiate detonation. The flash from the primer
passes through channels in the primer holder before reaching the delay detonator, which in
itself has a 0.001-second pyrotechnic delay. The overall delay is believed to be about 10 ms.
If the fuze fails to hit a target, centrifugal force weakens as rotation decays until the
pressure of the firing-pin spring overcomes centrifugal force. At this point, the firing-pin
spring drives the firing pin into the detonator to initiate self-destruction. This fuze does not
have an Out-of-line detonator.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
30x97-mm B HEI or HEI-T cartridge,
Model?
30-mm automatic gun, Model 3 CGF;
DEFA Models 540 and 541
2-127
(Reverse Blank)
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UNCLASSIFIED
Original AST-116011-001-75
Fuze, PDSD, Model FUA 723 (France)
FOM No. 1390-17-1-21
?
? A
? in".
k ?ti MAII
# 1 a rt
en I tki
I N 1.1 IA \ %
:, N
L 4k _A
joill' IVA Ilk :11
11/4.- irs
4 k Valois
:7,-`77-= srp,
'7 4,?, ail
p try t ?Lar to
0,414..oreo.;01?..4?0,4_,.._
oi.s...???....et
I.\
11,7.4*
0 1 I ?
0 1 /Aida A
I LRIVIMM
4 A I I " Pei Ay: *et. ?iri 411IPAS
we 4, se ??? ? .
titas?st?-?-?-?. ....%
PLUNGER
STRIKER SPRING
STRIKER BODY
ARMING BALL
SELF-DESTRUCT HOUSING
SPLIT RING
FIRING PIN
BALL ROTOR
-DUAL DETONATORS
LOWER DETONATOR
BOOSTER
Neg. 517139 (UNCLASSIFIED)
Figure 2-50. Fuze, PDSD, Model FUA 723, section view (U).
2-129
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UNCLASSIFIED
AST-1150H-001-75 Original
Fuze, PDSD, Model FUA 723 (France)
FOM No. 1390-17-1-21
(U) Description
The FUA 723 fuze (fig 2-50) represents one of the most recent developments of a
detonator-safe fuze for small-caliber projectiles. It combines a mechanical self-destruct
mechanism with an out-of-line detonator in a Ball rotor to provide a muzzle safety distance
of 15 meters.
(U) Unique Features
The fuze has several unusual features: (1) a highly-finished ball rotor surface, which
increases arming time; (2) a split safety-rmg that retains the rotor in safe position until
setback ceases; (3) two detonators in ball rotor, to insure functioning regardless of which
detonator is adjacent to the firing pin: (4) a fuze design that emphasizes simplicity, for
automated assembly and low cost.
(U) Characteristics
Fuze assembly:
Body material
Weight
Markings 7
Booster:
Body material
Body length
Explosive 7
Explosive weight
Functional data:
Arming method Spin
Firing method Impact
Safety devices Detonator rotor; safety ring
Arming distance m
Arming time
Self-destruct time 6 s
Delay time
2-130
UNCLASSIFIED
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PDSD, Model FUA 723 (France)
FOM No. 1390-17-1-21
(U) Characteristics (Continued)
The fuze is composed of a one-piece, watertight fuze body bored out from the rear to
receive components. A striker body containing four steel arming balls is located in a
self-destruct housing. A split safety-ring retains the ball rotor and striker body in safe
(unarmed) position. The ball rotor contains two detonators, 180? apart; in safe position the
rotor is 90? out-of-line with the firing pin. A lower detonator insures high-order detonation
of the booster. Detailed data on the fuze are not available.
(U) Functioning
During storage and transport, the striker spring forces the striker body against the split
safety-ring, which secures the ball rotor in an out-of-line position.
Upon firing, setback forces augment the pressure of the setback spring to prevent
centrifugal force from acting on the arming balls and split safety-ring. The ball rotor is thus
held in its out-of-line position until setback ceases and deceleration commences. At this
point, centrifugal force acts simultaneously on the four arming balls and the split
safety-ring, forcing the striker body forward and further compressing the striker spring. The
sections of the safety-ring move outward until they lie against the wall of the recess in the
self-destruct housing. This leaves the ball rotor free to move. Because of its inertia and the
reduced friction of its polished surface, the ball rotor acquires rotational velocity only
gradually from the projectile. At a point approximately 15 meters from the gun muzzle, the
rotor has reached the projectile's spin rate, and its two detonators are aligned with the firing
pin and the lower detonator. It is immaterial which of the two rotor detonators is adjacent
to the firing pin; either one will function on impact, while the other serves to transmit the
detonation to the booster. At this point the fuze is fully armed.
Upon impact with a target, the thin fuze nose is crushed, and the plunger transmits the
impact to the striker body. This shock, added to pressure of the striker spring, overcomes
the centrifugal force of the arming balls that has restrained rearward motion of the striker
body; the striker body is forced to the rear and thrusts the firing pin into the detonator to
initiate functioning.
Should the projectile fail to strike a target, projectile spin will continue to decay with
time and range until the centrifugal force acting on the arming balls becomes weaker than
the pressure of the compressed striker spring. At this point the striker spring forces the
striker body rearward; the firing pin is thrust into the detonator, and self-destruct is
initiated.
2-131
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UNCLASSIFIED
AST:1160H -001-75 Original
Fuze, PDSD, Model FUA 723 (France)
FOM No. 1390-17-1-21
(U) Functioning (Continued)
The 723 fuze functions instantaneously, with no delay on impact, with material equal
to or greater than 0.5-mm aluminum, or paperboard of a weight of 1 kg/m2, at angles of
obliquity up to 85?. It will not function against paperboard weighing 200 g/m2, which
corresponds to a large (2-mm diameter) raindrop.
The 723 fuze is designed for use in gun barrels with 7? rifling, but can be used in barrels
with 5? or 6? rifling; under these conditions self-destruct will occur after a time of flight
somewhat less than 6 seconds, depending on the muzzle velocity and pitch of rifling.
(U) Applications (Ammunition and Weapons
Ammunition
Weapons
HEI, HEI-T projectiles
20x139-mm HS 820-type gun,
20x102-mm M 56-type gun
2-132
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UNCLASSIFIED
Original 7
Neg. 516780
Figure 2-51. Fuze, PD,
Fuze, PD, Model FIRUSAT
FOM 139018-1-6
FIRUSAT, con
2133
(UNCLASSIFIED)
rand section views (U).
UNCLASS FIED
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UNCLASSIFIED
AST-1160H-0O1 -75 Original
Fuze, PD, Model FIRUSAT
FOM No. 1390-18-1-6
(U) Description
The Swiss PD fuze, Model FIRUSAT (fig 2-51), was developed by Setisa S.A. of
Geneva, Switzerland, for use with 81-mm and 120-mm mortar projectiles. It is a setback,
delayed-arming type designed for instantaneous action with a graze-sensitivity feature. It has
been tested for jolt, primer safety, double loading, and muzzle security.
(U) Unique Features
? Runaway escapement mechanism detenting firing pin.
? Locking pin derenting spring-loaded slider blocking detonator.
? Inertial-type primer holder providing graze feature.
? Plunger-type striker head permitting instantaneous action.
(U) Characteristics
Fuze assembly:
Body material Nickel-plated brass
Weight 9.04 oz (256.3 g)
Markings FIRUSAT-1
Length 4.2 in (106.6 mm)
Max diameter 1,23 in (31.2 mm)
Thread diam 0.92 in (23.4 mm)
Primer:
Explosive:
1st charge
2nd charge
Explosive weight
Potassium chlorate, antimony, sulfide,
and mercury fulminate
Black powder
0.06 g (0.92 gr)
2-134
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UNCLASSIFIED
Original
(U) Characteristics (Continued)
AST-116014-001-75
Fuze, PD, Model FIRUSAT
FOM No. 1390-18-1-6
Detonator:
Explosive type Lead styphanate, lead azide, PETN
Length 0.91 in (23.1 mm)
Max diam 0.61 in (15.5 mm)
Min diam 0.38 in (9.7 mm)
Functional data:
Arming method Setback
Firing method impact
Safety devices
Arming distance 25 m, min charge; 40 m, full charge
Arming time
Self-destruct time
Delay time
Frequency (for VT fuze only)
Sensitivity of functioning:
At 100 m
Sand (including desert sand)
Fresh snow
Swamp lands
DNA
DNA
DNA
Upon impact 2-mm cardboard
Upon impact
Upon impact
Upon impact
'Lod:mg pin de tent mg dider taloa Fang detonator ,ind r LI ml WA% esL apcmcnt de(C11t tug (-mug pin.
2-135
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UNCLASSIFIED
AST-116011-001-75 Original
Fuze, PD, Model FIRUSAT
FOM No. 1390-18-1-6
(U) Design Details
Neg. 516778
(UNCLASSIFIED)
Figure 2-52. Fuze, PD, Model FIRUSAT, section view (U).
2-136
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PD, Model F1RUSAT
FOM No. 1390-18-1-6
(U) Design Details (Continued)
The FIRUSAT fuze (fig 2-52) consists primarily of a nickel-plated brass fuze body (14)
bored out to house the firing-pin assembly, runaway escapement mechanism, primer holder
(4), primer (12), spring-loaded slider (10), and detonator cup (13).
The firing-pin assembly includes a plunger-type striker head (1), its spring (15), and the
firing pin (2). The assembly is secured at the forward end of the fuze by a retainer plug (16)
which screws into the fuze body.
The runaway escapement mechanism consists primarily of a pallet (6), escape wheel,
rack, gear and pinion, and a spring-loaded rack (7).
Figure 2-53 illustrates the interface of the rack (7) with the firing pin (2), primer
holder (4), and spring-loaded slider (10). The firing pin (2) rests on the shoulder of the rack
in the safe position. The pallet (6) is detented by a swivel-type cotter pin (9). This keeps the
escapement locked and thus prevents the firing pin from hitting the primer (12).
The spring-loaded slider consists of a slider, its spring, a cover, and a housing. The slider
is detented by a spring-loaded locking pin (11). This also prevents movement of the
inertial-type primer holder (4) held in place by its spring.
A plug (17) (fig 2-53) with a flash hole drilled through it is screwed into the base of the
fuze body.
The detonator assembly (13) is then placed in position followed by a rubber gasket to
provide a seal. The detonator assembly is locked in place by a retainer nut (18), which
screws into the fuze body, completing the assembly.
2-137
UNCLASSIFIED
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UNCLASSIFIED
AST-1160H -001-75
Fuze, PD, Model FIRUSAT
FOM No. 1390-18-1-6
(U) Functioning (fig 2-53)
1
Original
0 Stop
ARMED POSITION UNARMED POSITION
Neg. 516779 (UNCLASSIFIED)
Figure 2-53. Fuze, PO, Model FIRUSAT, runaway escapement interface view (U).
Upon firing, setback moves the swivel cotter pin (9) to the rear undetenting the verge
or pallet (6) of the runaway-type escapement. The timing wheel (5) via a pinion-gear
arrangement now controls the movement of the spring-loaded rack (7), and at the end of its
travel, a clearance hole in the rack aligns with the firing pin (2).
2-138
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UNCLASSIFIED
Original AST-1180H-001-15
Fuze, PD, Model FIRUSAT
FOM No. 1390-18-1-6
(U) Functioning (Continued)
The flash path of primer (12) located in the primer holder (4) is blocked by the
spring-loaded slider (10). When the rack has completed its travel, the spring-loaded locking
pin moves forward into a void created by the rack, releasing the slider. The spring-loaded
slider moves until the hole in it and the flash path are in line. This also frees the primer
holder (4). The fuze is fully armed. Upon impact, the plunger-type striker head (1)
compresses its spring, driving the firing pin (2) into the primer (12) which flashes to the
detonator (13), resulting in the initiation of the high explosive filler of the projectile.
In case of oblique impact or graze action, the primer holder (4) due to inertia is thrust
against the fuze firing pin (2), initiating the primer.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
81-mm HE projectiles
120-mm HE projectiles
81-mm mortars
120-mm mortars
2-139
(Reverse Blank)
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i
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PD, Model A
FOM No. 1390-18-1-18
1.24 IMAM
.96 DIAM
12 TPI
ALL DIMENSIONS IN INCHES
Neg. 516777 (UNCLASSIFIED)
Figure 2-54. Fuze, PD, Model A, contour view (U).
2-141
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model A
FOM No. 1390-18-1-18
(U) Description
The Model A Fp fuze (fig 2-54) was developed by the Tavaro Company of Switzerland
for -use with 81-mm and 120-mm mortar ammunition. It is a setback, delayed-arming fuze
designed for either instantaneous or delay functioning upon impact. The Model A design has
been tested to assure absolute safety against double loading and premature explosions to a
distance of 50 meters from the weapon.
(U) Unique Features
? Runaway escapement mechanism controlling the arming of the fuze.
? Unique primer carrier housing two primers and a delay charge.
? Dualized firing pins for instantaneous or delay action.
? Piyotable-type slider housing out-of-line detonator.
(U) Characteristics
Fuze assembly:
Body material Steel
Weight 7
Markings It, S, I
Length 4.50 in (114.3 mm)
Thread diam 0.95 in (24.1 mm)
Booster:
Body material Steel
Body length
Explosive 7
Explosive weight
2-142
UNCLASSIFIED
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UNCLASSIFIED
Original
(U) Characteristics (Continued)
Functional data:
Arming method
Firing method
Safety devices
Arming distance
Arming time
Delay time
(U) Design Details
SECTION A-A
14
11
10
17
AST-116011-001-75
Fuze, PD, Model A
FOM No. 1390-18-1-18
Setback
Impact
50 m (min)
0.71 s (est)
0.12 s
SECTION 8-8
Neg. 516776 (UNCLASSIFIED)
Figure 2-55. Fuze, PD, Model A (U).
*Out-of-line detonator, ball detent.
2-143
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UNCLASSIFIED
AST11601110175 Original
Fuze, PD, Model A
FOM No. 1390-18-1-18
(U) Design Details (Continued)
The Model A fuze (fig 2-55) is made mostly of brass and of steel components which are
protected against corrosion by a galvanized surface treatment.
The upper rotatable fuze body (section A-A) houses the firing-pin assembly consisting
of a striker head, a keyed plunger-type firing pin (1), and a coiled spring. The keyed firing
pin (1) is positioned into a guide bush or plate (2), which is pinned to the lower fuze body.
The guide bush or plate (2) also provides a seat for the firing pin assembly's coiled spring.
The rotatable upper fuze body is then sealed at its forward end by a closing cap which is
crimped 360? into an exterior groove.
The lower fuze body houses the primer-delay carrier (14), the lower (king pin (8) with
its extension, the detent system, and the delayed-arming mechanism (section B-B).
The primer-delay carrier is positioned in a housing (16). The carrier (14) encases the
upper primer (5), the pyrotechnic element (6), and the lower primer (7).
The detent system comprises the locking ball (3), safety ring (13) with prong-like clips,
shear ring (4), safety bush or setback sleeve (15), and a setback spring. The coiled spring (9)
is then positioned in a compressed state.
Located beneath the lower firing pin (8) is a central flash tube that cictents the delayed
arming mechanism (section B-B). This mechanism consists of an escapement and pivotable
slider (10) housing the out-of-line detonator (11). The escapement consists of a pallet (17),
escape wheel, and gear meshed to a spring-driven tooth sector of the pivotable slider.
The lower fuze body, which is transversally cut at its forward end, is secured to the
rotatable upper fuze body by set screws. The lower fuze body is threaded internally to
facilitate assembly of the booster (12) and is threaded externally for screwing into the high
explosive mortar projectile.
(U) Functioning (fig 2-55)
Safety position. The detent ball (3) locks the safety ring (13) which keeps the fuze in
the unarmed position.
2-144
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UNCLASSIFIED
Original AST?1160H-001-75
Fun, PD, Model A
FOM No. 1390-18-1.18
(U) Functioning (Continued)
Firing position. The fuze may be set for either instantaneous functioning "I" or
delayed functioning "R" by rotating the upper fuze body portion to the desired setting.
Upon firing, setback force moves the safety ring (13) and setback sleeve (15) rearward,
compressing its spring. The clips of the safety ring (13) then lock onto the lower notch of
the primer-delay carrier housing (16). As soon as setback dissipates, the compressed spring
(9) expands, moving the setback sleeve (15) and carrier (14) forward to a position where the
shear ring (4) is in contact with the plate (2) and the upper primer (5) is in firing position
relative to the keyed firing pin (1).
Simultaneously, the forward movement of the housing (16) moves the lower firing pin
(8) with its central tube forward, undetenting the pivotable slider (10). The spring-driven
tooth sector of the slider controlled by the pallet (17) of the escapement moves the
detonator (11) into the armed position. The detonator (11) is then locked onto the booster
(12) by a spring washer.
When the shoulder of the keyed firing pin (1) is rotated to the "I" setting, the shoulder
is in position to drive the carrier (14) and lower primer (7) against the lower firing pin (8),
resulting in initiation of the detonator (11) and booster (12). When the shoulder of the
keyed firing pin (1) is rotated to the delay or "R" setting, the shoulder is free to bypass the
carrier (14). Upon impact, the firing pin (1) stabs the upper primer (5), initiating the delay
element (6), lower primer (7), and in turn the detonator (11) and booster (12).
(U) Applications (Ammunition and Weapons
Ammunition
Weapons
81-mm HE projectiles
120-mm HE projectiles
81-mm mortars
120-mm mortars
2-145
(Reverse Blank)
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UNCLASSIFIED
Original
AST-1160H-001-75
Fuze, PD, Model RKVDIR 0265
FOM No. 1390-18-1-35
(UNCLASSIFIED)
I 0 2S0,
TT- -12NF-1
DETAIL OF THREADS
SIDE ELEVATION
ALL DIMENSIONS IN MILLIMETERS
(UNCLASSIFIED)
Figure 2-56. Fuze, PD, Model RKVDIR 0265, full and contour views (U).
(U) Description
The RKVDIR 0265 (fig 2-56) is a setback, delayed-arming fuze desired for either SQ
or delay action upon impact. It was developed by Oerlikon of Zurich, Switzerland, for use
with non-rotating mortar projectiles. The dimensions shown in figure 2-56 are for
installation on 81-mm teardrop-type mortar projectiles.
(U) Unique Features
This fuze contains two firing pins: one for SQ action, the other for delay. The two
primer-detonators used are held in an out-of-line position by a spring-loaded slider
controlled by an escapement via a pinion-rack arrangement as well as a detent system
provided by a setback sleeve, spring, detent balls, and locking bolt.
2-147
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UNCLASSIFIED
AST-1160H-001-75
Fine, PD, Model RKVDIR 0265
FOM No. 1390-18-1-35
(U) Characteristics
Fuze assembly:
Head material
Body material
Weight
Markings
Aluminum
Cadmium-plated steel
585 g (1.29 lb)
RKVDIR 0265
Booster:
Body material Aluminum
Body length 16.5 mm approx (0.65 in)
Explosive Tetryl
Explosive weight 4 g (61.6 gr)
Relay (columnar charge):
Explosive
Explosive weight
Length
Tetryl
0.06 g (0.92 gr)
33 mm approx (130 in)
Functional data:
Arming method Setback
Firing method Impact
Safety devices Slider-escapement, locking bolt &
&tent balls
Arming time 0.80 s
Delay time 0.50 s
Arming distance 25 m
Sensitivity:
SQ action
Delayed action
Functions on 4-mm cardboard target
Less than SQ action
2-148
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UNCLASSIFIED
Original
(U) Design Details (fig 2-57 and 2-58)
3
22
2
C F
41)4
SQo
5
? , AST-1160/1-001-75
Fuze, PD, Model RICVDIR 0265
FOM No. :1390-18-1-35
A-A
23
21
14
17
D
32 33
A
t_
B-B
10 II 9
A4
(UNCLASSIFIED)
Figure 2-57. Fuze, PD, Model RKVD1R 0265, detailed
sections A-A, B-B, D-D, and G (U).
2-149
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UNCLASSIFIED
AST-116011 -001-75
Fuze, PD, Model RKVD1R 0265
FOM No. 1390-18-1-35
(U) Design Details (Continued)
C-C
G
30
26
27
29
28
25
11 24
Original
F-F
(UNCLASSIFIED)
Figure 2-58. Fuze, PD, Model RKVDIR 0265, detailed sections C-C, E-E, and F-F (U).
2-150
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UNCLASSIFIED
Original AST-11608-001-15
Fuze, PD, Model RKVDIR 0265
FOM No. 1390-18-1-35
(U) Design Details (Continued)
The fuze body (1) is tightly sealed at its nose by the fuze head (2) with plastic
windshield (3). The nose section of fuze body contains the slider housing (4), which is
secured by the fuze head.
The slider (5) (section A-A) can move transversely to the fuze axis in the slider
housing. It contains the primer-detonator (6) with a pellet for SQ ignition and another
primer-detonator (7) for delayed ignition. Movement to the armed position is (section B-B)
by means of the slider spring (8) on a guide pin (9). The rack (10) on the slider meshes with
the pinion (11) of the escapement (12).
The inner and outer detent system (section A-A), which is positioned by the bushing
(15), locks the slider in the unarmed position until firing. The outer decent consists of the
setback sleeve (13) located in a hole in the fuze body. The setback sleeve is held forward, in
the safe position, by its spring (14). In this position, it is locked by the detent balls (16).
The detent balls ae held outwards by the locking bolt (18) and forward by a spring (17),
which are part of the inner detent system.
The escapement (section C-C) consists of a gear train (19) linked to the balance wheel
(20). The escapement is mounted on the bearing body and engages the rack of the slider
through the pinion (11), section E-E. The escapement (12), section A-A, delays the
movement of the slider to the armed position; this delay gives the required trajectory safety.
The SQ mechanism includes the SQ firing pin (21) built into the nose of the fuze. It is
held against its stop (23) by the pressure of its spring (22). The delay system (section F-F) is
built into the rear of the fuze. It consists mainly of the fixed holding pin (24), the guide
bush (25), the sleeve (26), the delay firing pin (27), the spring (28), and two detent balls
(29), forming the inner detent system. Because of the compression of the spring, the firing
pin is pushed forward. Both detent balls are thereby pushed outwards by the inclined face
on the front of the holding pin, thus locking the sleeve in position. The SQ and delay
mechanisms are mechanically independent of each other.
The setting key (30), section E-E, can be turned 900 in a sealed bearing. Its inner end is
so designed that it offers a passage to the SQ firing pin while it is set to "SQ" (superquick)
(section G). If the setting key is set on "13" (delay), the passage is blocked.
2-151
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model RKVD1R 0265
FOM No. 1390-18-1-35
(U) Design Details (Continued)
Tetryl is used in the fuze in the form of compressed pellets (section A-A). A columnar
charge (31) of 0.85 grain (0.055 gram) is located underneath the SQ primer-detonator in
the slider. The 62-grain (4.0-gram) charge of the booster (32) forms the lower end of the
explosive train. It is contained in the screwed-on cap (33) that also seals the rear end of the
fuze.
The total explosive content (without the primer-detonators) of the fuze amounts to
105.3 grains (6.825 grams).
(U) Functioning
This fuze's functioning is similar to fuze, PD, Model 21RKZ-2 (FOM No. 1390-18-1-36).
(U) Packaging
The completely assembled fuze is packaged in a two-piece cardboard tube
placed in a two-piece plastic container. The plastic container is then sealed with tape, as
illustrated in figure 2-59.
(UNCLASSIFIED)
Figure 2-59. Fuze, PD, Model RKVDIR 0265, packaging container (U).
2-152
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UNCLASSIFIED
Original AST-116014-001-75
Fuze, PD, Model RKVDIR 0265
FOM No. 1390-18-1-35
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
81-mm HE projectiles
81-mm mortars
2-153
(Reverse Blank)
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UNCLASSIFIED
Original
017
Ns20o
2'
1 r
a 30
c.4
AST-116011-00145
Fuze, PD, Model 21 RKZ-2
FOM No. 1390-18-1-36
-02
0-217_4
02afal
(UNCLASSIFIED) (UNCLASSIFIED)
Figure 2-60. Fuze, PD, Model 21 RKZ-2, full and contour views (U).
(U) Description
The 21 RKZ-2 PD fuze (fig 2-60) is a setback, delayed-arming type designed for either
SQ or delay action upon impact. It was developed by Oerlikon of Zurich, Switzerland, for
use with non-rotating mortar projectiles. The dimensions shown in figure 2-60 are for
installation on 81-mm teardrop-type mortar projectiles. This fuze can be assembled on
projectiles provided with NATO threads.
2-155
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UNCLASSIFIED
AST4160H-001-75
Fuze, PD, Model 21 RKZ-2
FOM No. 1390-18-1-36
(U) Unique Features
Original
This fuze contains two firing pins: one for SQ action, the other for delay. The two
primer-detonators are held in an out-of-line position by a spring-loaded slider controlled by
an escapement mechanism via a pinion-rack arrangement, as well as a detent systen
provided by a setback sleeve, spring, detent balls, and locking bolt.
(U) Characteristics
Fuze assembly:
Head material
Body material
Weight
Markings
Booster:
Body material
Body length
Explosive
Explosive weight
Relay (columnar charge):
Explosive
Explosive weight
Length
Aluminum
Cadmium-plated steel
305 g (0.67 lb)
21 RKZ-2
Aluminum
32 mm approx (1.26 in)
Tetryl
Tctry1
0.055 g (0.85 gr)
39 mm approx (1.54 in)
Functional data:
Arming method Setback
Firing method Impact
Safety devices Slider-escapement, locking bolt, &
detent balls
Arming time 0.8 s
Arming distance 25 in
Delay time 0.05 s
Sensitivity:
SQ action Functions on 4-mm cardboard target
Delayed action Less than SQ action
2-156
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UNCLASSIFIED
Original
AST-1160H-031 -75
Fuze, PD, Model 21 RKZ-2
FOM No. 1390.18-1.36
(U) Design Details (fig 2-61)
SQ
26
11
13
12
14
25
27
Neg. 515293 (UNCLASSIFIED)
Figure 2-61. Fuze, PD, Model 21 EKZ-2, section view (U).
2-157
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UNCLASSIFIED
AST-116011-001-75 Original
Fuze, PD, Model 21 RKZ-2
FOM No. 1390-18-1-36
(U) Design Details (Continued)
The fuzc body (8) is tightly sealed at its forward end by the fuze head (5) with plastic
windshield (1). The fuze body contains the slider housing (7) which is secured by the fuze
head (5).
The slider (10) contains the SQ primer-detonator (9), which is initiated by the SQ
firing pin (2), and the delay (D) primer-detonator (24), which is initiated by the delay firing
pin (23). Movement to the armed position is by means of the slider spring (20) on the guide
pin (21). The rack (19) of the slider meshes with the pinion (18) of the escapement
mechanism (6).
The inner and outer detent system locks the slider in the unarmed position until firing.
The outer detent system consists primarily of the setback sleeve (11), setback spring (25),
and bushing. Parts of the inner detent system include the guide bush, spring, delay firing
pin, decent balls (12), locking bolt (13), and holding pin (14). The setback sleeve is held in a
safe position by the setback spring. In this position it is locked by the detent balls. The
detent balls are held outward by the locking bolt, which is held forward by its spring (14).
The escapement (6) consists of a gear train (15) linked to a balance wheel. The
escapement mechanism is mounted on a bearing body that engages the rack of the slider
through the pinion. The escapement controls the movement of the slider to the armed
position, thereby providing adequate trajectory safety.
The SQ mechanism includes the SQ firing pin (2) built into the nose of the fuze. The
SQ firing pin is held against its stop (3) by the pressure of its spring (4). The delay
mechanism is built into the rear of the fuze. It includes mainly parts of the inner detent
system, which consists of the locking bolt (13), holding pin (14), guide bush (26), guide
sleeve, firing pin (23), spring (14), and two detent balls (12).
The delay firing pin (23) is held forward by the compression of the locking-bolt spring
(14). Both detent balls are pushed outwards by the inclined face on the front of the holding
pin (27), thereby holding the guide sleeve in position.
The setting key (22) can be turned 900 in a sealed bearing. Its inner end is designed to
provide an opening for the SQ firing pin when the key is set for "SQ." If the key is set on
"D," this opening is blocked.
2-158
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PD, Model 21 RKZ-2
FOM No. 1390-18-1-36
(U) Design Details (Continued)
Tetryl is used in the fuze in the form of compressed pellets. A columnar charge (16) in
line with the firing pin (2) acts as a relay for amplifying the detonation of the booster (17).
(U) Functioning
Upon firing, setback forces causes the locking bolt (13) to move rearward, releasing the
detent balls (12). Both springs (14, 25) are fully compressed.
If the key is set for "SQ," then the SQ firing pin (2) moves rearward and enters the
blind hole in the slider (10), holding the slider in the unarmed position. If the key is set for
"D," the SQ firing pin is blocked from entering the hole of the slider.
When the acceleration ceases, the compressed springs (14, 25) expand, pushing the
sleeve (11) and locking bolt (13) forward. The locking bolt moves forward first, pushing the
detent balls outward. The sleeve then advances until the detent balls are pushed out against
the rim of a pressed-in bushing. The SQ firing pin (2) simultaneously moves back to its
original position by the expansion of its spring (4), while the force of spring (20) starts to
move the slider to the armed position by driving the escapement mechanism (6) which
controls the rate of arming.
The fuze is armed when either the SQ (9) or delay (24) primer-detonators, depending
on the setting, are aligned with their respective firing pins (2 or 23).
The slider (10) is kept in the armed position by the slider spring (20) and escapement
, mechanism (6).
If SQ setting is used, upon impact with the target the SQ firing pin (2) stabs
primer-detonator (9), detonating the tetryl column (16) and in turn detonating the booster
(17). Figure 2-62 depicts SQ functioning upon impact.
9-159
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model 21 RKZ-2
FOM No. 1390-18-1-36
(LI) Functioning (Continued)
Neg. 515295 (UNCLASSIFIED)
Figure 2-62. Fuze, PD, Model 21 RIC-2,
SQ functioning (U).
2-160
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UNCLASSIFIED
Original
(U) Functioning (Continued)
AST-1 16011-001-75
Fuze, PD, Model 21 RKZ-2
FOM No. 1390-18-1-36
If the delay setting is used, the SQ firing pin is blocked. Upon impact, the deceleration
of the projectile causes the sleeve to move forward due to inertia while the firing pin (23),
which is retained by the locking bolt, remains locked. Compression of the spring by the
firing pin is now increased. After retardation has reached zero, the spring expands and
pushes the sleeve back, allowing the detent balls to move outwards and to release the firing
pin which is driven by its spring into the delay primer-detonator. The flash passes through a
slot in the slider to the SQ primer-detonator, detonating the columnar charge of tetryl and
resulting in detonation of the booster. Figure 2-63 illustrates delay functioning upon
impact.
Neg. 515294
(UNCLASSIFIED)
Figure 2-63. Fun, PD, Model 21 RKZ-2, delay functioning (U).
2-161
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UNCLASSIFIED
ASTI 180H-00
0, Mode
1390- 36
Packaging
The 21 R KZ
sealed on can (fig 2-54).
10(1-2
cardboard tube which is ?ackcd in a he it
Original
VIE
Figure 2-64. Fuze, PD, Model 21 RKZ-2, packaging conrainer (Li).
2-162
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PD, Model 21 RKZ-2
FOM No. 1390-18-1-36
(U) Special Tests
The 21 RKZ-2 fuze has been successfully tested for double-loading safety, detonator
safety, and short-impact safety (i.e., trajectory safely). In addition, drop, jolt, cold, hot, and
waterproof tests have been conducted, meeting US Military Standards.
(U) Applications (Ammunition and Weapons
Ammunition
Weapons
81-mm HE projectiles
81-mm mortars
2-163
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UNCLASSIFIED
Original
AST-116011,001-75
PD, Model RK VOIR 0262/713
FOM No. 1390-18-1-39
Neg. 515357 (UNCLASSIFIED)
Figure 2-65. Fuze, PD, Model KKVDIR 0262/75 with 8I-mm projectile (U).
(1)) Description
The R.K VDIR 0262171'> (fig 2-65) is a setback-armed PD fuze designed for either delay
.and SQ action. Except fur no escapement mechanism to control the rate of arming, the
K VUl R 0262;7 B is similar in design and functioning to that of the Oerlikon
RK VDIR 0265 and 21 RKZ-2 PD fuzcs (FOM Nos. 1390-18-1-35 and 1390-18-1-36), This
fuze is designed for 81-mm and 120-mm non-rotating mortar projectiles.
(U) Unique Features
* Spring-loaded slider with out-of-line SO and deiay ?primer-detonators.
2-165
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UNCLASSIFIED
AST-1160H-001-75
Fuze, PD, Model RKVDIR 0262/7B
FOM No. 1390-18-1-39
(U) Unique Features (Continued)
? Inner and outer detent system.
? Two separate firing pins for SQ and delay action.
(U) Characteristics
Fuze assembly:
Head material
Body material
Weight
Markings
Total length
Explosive weight
Aluminum
Cadmium-plated steel
670g (1.481b)
RKVDIR 0262/7B
130 mm (5.12 in)
15 g (0.033 lb)
Booster:
Body material Aluminum
Body length
Explosive Tetryl
Explosive weight 7
Relay (columnar charge):
Explosive type
Explosive wieight
Tetryl
7
Functional data;
Arming method Setback
Firing method Impact
Safety devices Locking bolt, two detent balls and
slider
Arming time 1.2 s
Arming distance 50 m?
Delay time 0.05 s
2-166
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Original
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PD, Model RKVDIR 0262/78
FOM No. 1390-18-1-39
(U) Functioning
Except for having no escapement mechanism to control rate of arming, functioning is
similar to that of the RKVDIR 0265 and 21 RKZ-2 PD fuzes.
(U) Remarks
Upon request, Oerlikon will provide this fuze with the trajectory safety (i.e.,
short-impact safety) by incorporation of the escapement mechanism via a pinion-rack
arrangement to the spring-loaded slider containing the SQ and delay primer-detonators.
This fuze has been tested successfully for double-loading safety in both 81-mm and
120-mm mortars. The RKVDIR 0262/7B is specially designed for impact on very hard
ground at the highest charge used with the 120-mm mortar. The reliability of the design
reportedly has been proved through thorough testing and meets US Military Standards.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
81-mm HE projectiles
120-mm HE projectiles
81-mm mortar
120-mm mortar
2-167
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ii
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UNCLASSIFIED
Original
AST1150H-001-75
Fuze, PD, Model RKVDIR 0264
FOM No. 139048-1-40
(UNCLASSIFIED)
Figure 2-66. Fuze, PD, Model RKVDIR 0264 with 81-mm projectile (U),
(U) Description
The OerRican RKVD
similar o the RKVDIR 02
the designation L35A1. It
in order to accommoda
projectiles.
(U) Unique Features
0264 PD fuze (fig 2-66) is a setback, delayedarming type
This fuze has been introduced in the United Kingdom under
longer and has a larger booster with more explosives
and longer modern streamlined 81-mm mortar
the hea
Delayed arming controlled via escapement mechanisrrn
2-169
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UNCLASSIFIED
AST-1160H-001-75
Fuze, PD, Model RKVDIR 0264
FON' No. 1390-18-1-40
(U) Unique Features (Continued)
? Detonator safety via out-of-line explosives.
? Bore safety via inner and outer detent system.
(U) Characteristics
Fuze assembly:
Head material
Body material
Total weight
Markings
Total length
Visible length
Max &am
Explosive type
Explosive weight
Functional data:
Arming
Firing method
Safety devices
Aluminum
Cadmium-plated steel
575 g (1.27 lb)
RKVDIR 0264
150 mm (5.91 in)
86 mm (3.39 in)
61 mm (2.40 in)
Tetryl
34 g (0.075 lb)
Setback
Impact
Slider-escapement, locking bolt, and
detent balls, safety pin
25m
0.9 s
0.05 s
Arming distance
Arming time
Delay time
(U) Functioning
Original
This fuze is similar in functioning to that of the British L35A1 PD fuze
(FOM No. 1390-35-1-17) and the Oerlikon RKVDIR 0265 and 21 RKZ-2 PD fuzes.
2-170
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PD, Model RKVDIR 0264
FOM No. 1390-18-1-40
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
81-mm mortar projectiles
81-mm mortar
2-171
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UNCLASSIFIED
Original
Neg. 515359
ASTMS? -001-15
Fuze, PD, Model RKVDIR MZX-325
FONt No. 139(J-18-IA1
UNCLASSIFIED)
Figure 2-67. Fun, PD, Model VDIR ZX-325 with 8I-mm projectile (U).
(U) Description
The RKVDIR MZX-325 PD fuze (fig 2-67) was developed by Oerlikon for 81-mm and
120-mm non-rotating mortar projectiles. It is a setback, delayed-arming type similar
design and functioning to the RKVDIR 0265 PD fuze. Exposed length of fuze is 67.5 mm
with a body diameter of 46.5 mm.
Unique Features
?Delayed arming controlled via escapement mechanism.
2-173
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UNCLASSIFIED
AST-116011-001-75 Original
Fuze, PD, Model RKVDIR MZX-325
FOM No. 1390-18-141
? Detonator safety via out-of-line explosives.
? Bore safety via inner and outer detent system.
(U) Characteristics
Fuze assembly:
Head material Aluminum
Body material Cadmium-plated steel
Total weight 596 g (1.31 Ib)
Markings RKVDIR MZX 325
Total explosive weight 13 g (0.29 lb)
Total length 113 mm (4.45 in)
Booster:
Body material Aluminum
Body length
Explosive Tetryl
Explosive weight
Relay (columnar charge):
Explosive type Tetryl pellets
Functional data:
Arming method Setback
Firing method Impact
Safety devices Slider-escapement, locking bolt,
detent balls
Arming distance 25 in
Arming time 0.9 s
Delay time 0.05 s
(U) Functioning
This fuze is similar in functioning to Oerlikon PD fuzes, Models RKVDIR 0265 and
21 RKZ-2 It is easily changed from instantaneous action to delayed action.
2-174
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PD, Model RKVDIR NIZX-325
FOM No. 1390-18-1-41
(U) Remarks
Thorough testing has proven this fuze's double-loading safety and reliability of design.
The fuze is very sensitive on instantaneous action upon impact in snow, water, etc., due to
the fine's protruding firing pin and plastic windshield. The delay system allows application
for ricochet firing.
(U) Applications (Ammunition and Weapons
Ammunition
Weapons
81-mm HE projectiles
120-mm HE projectiles
81-mm mortars
120-mm mortars
2-175
(Reverse Blank)
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UL.D' AN' PAGE
it
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UNCLASSIFIED
Original
AST-1160H-001-75
Fuze, PD, Model RKVDIR 0265/21
FOM No. 1390-18-1-42
Neg. 515354 (UNCLASSIFIED)
Figure 2-68. Fuze, PD, Model RKVDIR 0265/21 with 81-mm projectile (U).
(U) Description
The RKVDIR 0265/21 PD fuze (fig 2-68) is a setback-armed type designed for either
SQ and delay action. Except for lack of an escapement-pinion-rack arrangement, the fuze is
similar in design and functioning to that of the Oerlikon RKVDIR 0265. It is intended for
use on both 81-mm and 120-mm mortar projectiles.
(U) Unique Features
? Spring-loader slider with out-of-line explosives.
? Detent system with locking bolt and two detent balls.
2-177
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UNCLASSIFIED
AST-1160H-001-75
Fuze, PD, Model RKVDIR 0265/21
FOM No. 1390-18-1-42
(U) Characteristics
Fuze assembly:
Head material
Body material
Weight
Markings
Aluminum
Cadmium-plated steel
595 g (1.31 lb)
RKVDIR 0265/21
Booster:
Body material Aluminum
Body length
Explosive Tetryl
Explosive weight
Relay (columnar charge):
Explosive type Tetryl pellets
Original
Functional data:
Arming method Setback
Firing method Impact
Safety devices Slider, locking bolt and 2 detent balls
Arming distance 25 m (approx)
Arming time 0.8 s
Delay time 0.05 s
(U) Functioning
Except for escapement mechanism, this fuze is similar in functioning to that of the
RK Z-2 and RKVDIR 0265 PD fuzes developed by Oerlikon.
(U) Remarks
Upon request, oerlikon will provide this fuze with the trajectory safety (i.e.,
short-impact safety) by incorporation of the escapement mechanism via a pinion-rack
arrangement to the spring-loaded slider containing the SQ and delay primer-detonators.
2-178
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UNCLASSIFIED
Original AST-116011-00145
Fuze, PD, Model RKVDIR 0265/21
FOM No. 1390-18-1-42
(U) Remarks (Continued)
This fuze has been successfully tested for dOuble-loading safety in both the 81-mm and
120-mm mortars. This fuze is also designed for impact on very hard ground at the highest
charge used with the 120-mm mortar. The reliability of the design reportedly has been
proved through thorough testing and meets US Military Standards.
(U) Applications (Ammunition and Weapons
Ammunition
Weapons
81-mm HE projectiles
120-mm HE projectiles
81-mm mortar
120-mm mortar
2-179
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UNCLASSIFIED
Original
Neg. 515355
AST-1160/1-001-75
Fun, PD, Model RKVDIR MZX-328
FOM No. 1390-18-1-43
(UNCLASSIFIED)
Figure 2-69. Fuze, PD, Model RKVDIR MZX-328 with 81-mm projectile (U).
(U) Description
The Oerlikon RKVDIR MZX-328 fuze (fig 2-69) is a setback, delayed-arming type
similar in design and functioning to that of the RKVDIR 0265. It is intended for use on
both 81-mm and 120-mm mortar projectiles.
(U) Unique Features
? Delayed arming controlled via escapement mechanism.
? Detonator safety via out-of-line explosives.
? Bore safety via inner and outer detent system.
2-181
UNCLASSIFIED
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UNCLASSIFIED
AST-11608-001-75
Fuze, PD, Model RKVDIR MZX-328
FOM No. 1390-18-1-43
(U) Characteristics
Fuze assembly:
Head material
Body material
Total weight
Markings
Total length
Visible length
Maximum diam
Explosive weight
Explosive type
Aluminum
Cadmium-plated steel
605 g (1.33 lb)
RKVDIR MZX-328
99.5 mm (3.92 in)
71.5 mm (2.81 in)
61 mm (2.40 in)
6.5 g (100 gr)
Tetryl
Original
Functional data:
Arming method Setback
Firing method Impact
Safety devices Slider-escapement, locking bolt and detent
balls
Arming distance 25 m (approx)
Arming time 0.90 s
Delay time 0.05 $
(U) Functioning
The functioning of this fuze is similar to the RKVDIR 0265 PD fuze.
(U) Remarks
This fuze has been successfully tested for double-loading safety in both 81-mm and
120-mm mortars.
2-182
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PD, Model RKVDIR MZX-328
FOM No. 1390-18-1-43
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
81-mm HE projectiles
120-mm HE projectiles
81-mm mortar
120-mm mortar
2-183
(Reverse Blank)
UNCLASSIFIED
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Ult PQE
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UNCLASSIFIED
Original
SHOCK ELEMENT
ARMING BALLS
AST4160114101-75
Fuze, PDSD, Oerlikon, Type KZD-0250
FOM No. 1390-18-1-44
FIRING PIN BUSHING
ROTOR
DETONATOR
FLASH HOLE
SELF-DESTRUCT SPRING
CONICAL EDGE OF
SELF-DESTRUCT HOUSING
FIRING PIN
FUZE BODY
BOOSTER
Neg. 517130 (UNCLASSIFIED)
Figure 2-70. Fuze, PDSD, Type KZD-0250, section view (U).
(U) Description
The KZD-0250 (fig 2-70) is a conventional PD fuze with a mechanical self-destruct
feature activated by projectile spin decay. The out-of-line detonator is mounted in a ball
rotor. The fuze is used with the 301113-mm B HE-I cartridge, Type MSB-K, which is
designed for air-to-air use in DEFA, Type 552, aircraft guns. The KZD-0250 fuze was
developed prior to 1962.
2-185
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PDSD, Oerlikon, Type KZD-0250
FOM No. 1390-18-1-44
(U) Characteristics
Fuze assembly:
Body material Aluminum
Weight 31 g (0.068 lb)
Markings
Booster:
Body material
Body length
Explosive 7
Explosive weight 7
Functional data:
Arming method Spin
Firing method Impact
Safety devices Out-of-line detonator (rotor)
Arming distance 3 m (est)
Arming time
Self-destruct time 5-13 s (est)
Delay time N/A
(U) Design Details
The fuze consists of an aluminum body that contains a self-destruct mechanism, a,
firing pin, a ball rotor carrying an out-of-line detonator, and a booster. In storage and
shipment, the fuze is kept safe by the out-of-line position of the detonator in the rotor.
Rotor position is maintained by pressure from the self-destruct spring and shock element,
acting through the firing-pin bushing.
(U) Functioning
Upon firing, the shock element is crushed by setback. When setback ceases, centrifugal
force causes the arming balls to move outward and forward against the conical surface of the
self-destruct housing. This action moves the firing-pin bushing forward, further compressing
and restraining the self-destruct spring, and releasing pressure on the rotor. Centrifugal force
causes the unbalanced rotor, now free, to rotate until the detonator is aligned with the firing
2-186
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UNCLASSIFIED
Original AST-116011-001-75
Fuze, PDSD, Oerlikon, Type KZD-0250
FOM No. 1390-18-1-44
(U) Functioning (Continued)
pin. Upon impact, the firing pin is driven into the detonator, which initiates detonation of
the booster. If impact does not occur, projectile spin will decay and centrifugal force
decrease until the compressed self-destruct spring overcomes the spin force on the arming
balls and drives the firing pin into the detonator,
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
30-mm HEI (mine) cartridge,
Type MSB/K (30x1.13-mm B)
30-mm aircraft gun, DEFA, Type 552
2-187
(Reverse Blank)
UNCLASSIFIED
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UNCLASSIFIED
Original AST-11608-001-75
rum, PDSD, Hispano-Suiza, Model AM-2-BM
FOM No. 1390-18-147
_ - Fuze Body Ci)
Striker Spring ( 2 )
Striker
Spring Support (3)
Balls (4)
Pressure Ring ( 5)
Split Collet (6)
_Split Sleeve( 7)
Flat
- -Spiral Spring (5)
Striker (9;
- Guide Sleeve (10)
-Detonator (11)
Rotor ,
Type Shutter 02)
-Centrifugal Bolt (13)
- Spring Ring (14)
?Closing Plug (15)
(UNCLASSIFIED)
Figure 2-71. Fuze, PDSD, Model AM-2-BM, section view (U).
(U) Description
This (fig 2-71) is a PDSD fuze with an out-of-line detonator and delayed arming,
designed for air-to-air projectiles fired from 30x113-mm B ADEN aircraft guns.
(U) Characteristics
Fuze assembly:
Body material 9
Weight 36-40 g (0.079 to 0.088 lb)
Markings AM-2 S.M.
2-189
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UNCLASSIFIED
AST-1160H-001-15 Original
Fuze, PDSD, HispanoSuiza, Model AM-2-BM
FOM No. 1390-18-147
(U) Characteristics (Continued)
Booster:
Body material
Body length
Explosive
7
Explosive weight
Functional data:
Arming method Spin
Firing method Impact
Safety devices Arming coil; out-of-line detonator
Arming distance 13 m
Arming time
Self-destruct time 612 s
(U) Functioning
During storage and shipment, the detonator (11) is held out of line with the striker (9)
and firing pin by a centrifugal bolt (13) that fits in a recess in the rotor and is retained by a
spring ring (14). The firing pin is also restrained from moving rearward by a split collet (6)
whose locking segments are retained by an arming coil or spiral spring (8) that is itself
retained by a split sleeve (7).
Upon firing, setback forces hold all fuze components in the unarmed position. When
the projectile leaves the muzzle, setback ceases and centrifugal force causes the spring ring
(14) to open and the centrifugal bolt (13) to move outward, freeing the rotor. Centrifugal
force acting on the unbalanced rotor causes it to erect, so that the detonator is aligned with
the firing pin and the booster. This occurs at a point approximately 0.9 meter from the gun
muzzle. The fuze remains unarmed at this point because the striker is still restrained by the
arming delay feature.
At the moment of firing, setback forces increase the pressure exerted by the striker
spring (2), acting through the striker, on the split collet and the arming coil, thus retaining
them in position. Centrifugal force causes the split sleeve surrounding the split collet to
open so that it lies against the inner wall of the recess. As acceleration ceases and setback
pressure is reduced, centrifugal force causes the five arming balls (4) to inpye radially
2-190
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PDSD, Hispano-Suiza, Model AM-2-BM
FOM No. 1390-18-1-47
(U) Functioning (Continued)
outward against the conical interior face of the pressure ring (5). This raises the striker
body, further compressing the striker spring. As the striker body is lifted, pressure on the
split collet and arming coil is removed. Centrifugal force causes the arming coil to unwind,
permitting the segments of the split Collet to move radially outward, so that they clear the
striker. At this point the projectile has traveled about 13 meters from the gun muzzle; the
fuze is fully armed, with the detonator in line with the firing pin, and the striker held in its
forward position against pressure of the compressed striker spring by centrifugal force acting
on the five arming balls. Upon striking a target, impact is transmitted through the striker
body, overcoming the centrifugal force acting on the five arming balls and forcing them
inwards. The striker spring then thrusts the firing pin into the detonator to initiate fuze
functioning with increasing range, the centrifugal force acting on the arming balls decreases
as spin decays, which reduces the impact required to overcome this force; the increased
sensitivity of the fuze compensates for the reduced striking velocity at longer ranges. If the
projectile fails to strike a target, spin continues to decay to a level at which pressure of the
striker spring overcomes the centrifugal force acting on the arming balls. At this point,
which falls between 6 and 12 seconds of flight, the striker spring drives the striker and firing
pin into the detonator, initiating self-destruction of the projectile.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
HEI cartridge, Model UIA
30x113-mm B ADEN aircraft gun
2-191
(Reverse Blank)
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UNCLASSIFIED
r 6 (i
SC
AST- H 01-75
Fuze POModel Is:VD
FOM No, 1390-18-21
4.
DINA
TPI
ALL DIMENSIONSN INCHES
(UNCLASSIFIED)
Figure 2-72. Fuze, PD, Model KVD, full and contour vie (U).
fl
The KVD PD fuze (fig 2-72) ?manufactu by .Oerlikon Co. of Switzerland was
dee.loped for use with 80-mm high-explosive aircraft ksetback, delayed-arming
fuze designed for instantaneous action upon impact.
2-193
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UNCLASSIFIED
AST-116011-001-75
Fuze, PD, Model KVD
FOM No. 1390-18-2-1
(U) Unique Features
? Escapement mechanism controlling the arming time of the fuze.
? Slider housing
setback pin.
(U) Characteristics
primer-detonator in out-of-line position detented by
Fuze assembly:
Body material
Weight
Markings
Length
Max diam
Maj thread diam
Booster:
Body material
Body length
Explosive
Explosive weight
Cadmium-plated brass
0.67 lb (304 g)
MZ. 50.00
4.85 in (123.2 min)
1.30 in (33 nini)
1.1 in (28 nun)
Steel
1.75 in (44.45 mm)
PETN
13.62 g (0.030 lb)
Functional data:
Arming method Setback
Firing method Impact
Safety devices Setback pin, setback spring, and
out-oiline Jider
Arming distance
Arming time
2-194
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UNCLASSIFIED
Original
(U) Design Derails
22227222222:
2
6
(
4 12
Neg. 516574
7
17
IS
e
AST-1113011-001-Th
Fine, PD, Model KVD
FOM No. 1390-18-2-1
(UNCLASSIFIED)
Figure 2-73. Fuze, PD, Model KVD, exploded view (1.1).
The fur (fig 2-73) consists primarily of a cadmium-plated brass fuze body ) bored
?out at the nose end and base to facilitate assembly of the firing pin components, escapement
and slider mechanism components, detem components, and booster assemblage.
The firing pin components include an aluminum firing pin with a solid cylindrical head
(4), a steel support and guide (3), and a steel coil spring (2). The assembly is held in place by
450 chamfered-steel holder (5) crimped 360? at the nose end of the fuze, A polyethylene
cap is then crimped to the groove of the fine's ogive, providing a watertight seal.
The escapement-mechanism components for controlling or delaying the arming of the
fuze [i.e., the movement of the rack (21)1 includes a brass escape wheel and spur gear (9), a
steel pinion-brass gear assembly (10), a steel gear spindle (11), a brass pallet (12), and a brass
bearing plate (13) which fits into the transversally cur-out portion of the safety and arming
body (8). The retainer sleeve (7) is then slipped over the assembled escapement mechanism.
The decent components include the setback pin (20) and the setback spring (19) that fits
into an axially drilled hole in the S&A body (8). The rack (21) is also placed,in an axially
drilled hole in the body (8) and meshes with the pinion gear assembly (10).
2-195
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UNCLASSIFIED
MT-116011-001-75 Original
Fuze, PD, Model KVD
FOM No. 1390-18-2-1
(U) Design Details (Continued)
The slider (16) and its springs (17 and 18) are positioned in a cut-out portion at the
forward end of the S&A body (8). The slider (16) is pinned to the S&A body (8) by the
retainer pin (14) which fits into an axially drilled hole and the safety pin (15) which fits
into a transversally drilled hole.
The central flash hole of the S&A body (8) is sealed by a front and rear brass closing
cup.
The steel booster cup (6), threaded internally and housing two booster pellets, is
screwed onto the external threads of the S&A body (8), completing the assemblage.
The fuze body (1) is threaded externally for assembly into the warhead of an 80-mm
HE rocket.
(U) Functioning (fig 2-74)
SECTION SECTION
A A GB
Neg. 516575 (UNCLASSIFIED)
Figure 2-74. Fuze, PD, Model KVD, section view (U).
2-196
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UNCLASSIFIED
Original AST-116011101-75
Fuze, PD, Model KVD
FOM No. 1390-18-2-1
(U) Functioning (Continued)
When the carrier rocket is fired, the setback pin (6) and the rack (4) start to move
rearward. The setback pin has its travel hindered only by the spring (7) which it compresses
quickly. The rearward movement of the rack is delayed by the fuze clockwork mechanism
(5) through the pinion gear. When the rack top has moved below the transversely drilled
hole in which the safety pin (12) is assembled, the safety pin may be cammed into the
cavity above the rack and setback pin. This transfer is accomplished by the continued
acceleration forces acting on the safety pin through the tapered surface of its seat in the
slider retaining pin (11), When the slider retaining pin moves below the bottom surface of
the slider assembly slot, the slider assembly (3) is freed and then pushed across its slot by
the slider spring. This movement aligns the primer-detonator (10) between the firing pin (2)
and the flash hole to the booster pellets (8 and 9). This, however, does not happen until the
acceleration forces, which had also moved the firing-pin point rearward into the hole in the
slider, are decreased sufficiently to allow the firing-pin spring (1) to return the firing pin to
its forward position out of the slider.
On impact, the polyethylene nose cap is crushed and the firing pin is driven rearward
into the primer-detonator.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
80-mm HE rocket
80-mm aircraft rocket launcher
2-197
(Reverse Blank)
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UNCLASSIFIED
Original
AST-1160H-001-75
FUZC. PDSD, Model FZ-104 and variants FZ-104 MI,
F7-104 M2, F7-104 M12, and FZ404 M22
1390494.2 (F7,404)
390191-24 (FZ-I 04 MI)
FOM Nos. 390-194-2-2 (FZ-104 M2)
390194-2-3 (F7-104 MI 2)
1390-194-2-4 (FZ-104 Mn)
Neg.502778 (UNCLASSIFIED)
Figure 2-75, Fuze, EDSD, Model FZ-104,
full view (U).
2199
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PDSD, Model FZ-104 and variants FZ-104 MI,
FZ-104 M2, FZ-104 MI2, and FZ-104 M22
1390-19-1-2 (FZ-104)
1390-19-1-2-1 (FZ-104 MI)
FOM Nos. 1390-19-1-2-2 (FZ404 M2)
1390-19-1-2-3 (FZ-104 M12)
1390-19-1-24 (FZ-104 M22)
(U) Description
FZ-104 (fig 2-75) is the basic designation for a family of very reliable PDSD fuzes
designed by Bofors for use with the Bofors 40-mm antiaircraft gun, Model L/70. Model
FZ-104 is a product-improved Model FZ-103 fuze. Variants of the FZ-104 are used in the
Bofors 40-mm L/60 and 57-mm L/60 antiaircraft guns. The FZ-104 and its variants are in
use by quite a number of nations throughout the world. Manufacturers in a number of
countries, including West Germany and Spain, produce the FZ-104 or its variants under
Bofors license. Models FZ-104 and FZ-104 M12 have been NATO standard fuzes constantly
since 1960.
Fuze FZ-104 is an effective, ru ed, reliable, inexpensive PDSD fuze of relatively
simple design. A pyrotechnic element initiated by setback upon firing provides a reliable
self-destroying action. Both setback and spin are required to arm the fuze. Delayed arming is
ensured by a pyrotechnic delay element which locks the striker into a niche in the side of
the out-of-line detonator rotor until approximately 0.06 seconds after firing. Several
versions (or variants) of the basic FZ-104 provide different post-impact delay times and the
presence or absence of an additional friction detonator to provide a graze action. All five
versions of the FZ-104 mentioned here employ a Bofors rain safety device.
The status of the basic FZ-104 fuze is unknown. FZ-104 may be a generalized
designation including fuzes FZ-104 MI and FZ-104 M2, or it could be synonymous with
FZ-104 Ml. The basic FZ-104 fuze may be out of use, replaced by its variants FZ-104 Ml,
FZ-104 M2, FZ-104 M12, and FZ-104 M22.
The variants differ from each other as follows:
? FZ-104 M1 incorporates a 0.3- to 0.4-ms post-impact delay, but does not
have the extra friction detonator for graze action.
? F7-104 M2 incorporates a 0.1- to 0.2-ms post-impact delay, but does not
have the extra friction detonator for graze action. Possibly, this is a
"su perq Inc k " fuze.
2-200
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Original AST-1160H-001-75
Fuze, PDSD, Model FZ-104 and sariants FZ-104 MI,
FZ-104 112, FZ.104 M12, and FZ-104 M22
1390-19-1-2 (FZ-104)
1390-19-1-2-1 (FZ-104 M1)
FOM Nos. 1390-19-1-2-2 (FZ-104 M2)
1390-19-1-2-3 (FZ-104 M12)
1390-19-1-2-4 (FZ-104 M22)
(U) Description (Continued)
? FZ-104 MI 2 incorporates a 0.3- to 0.4-ms post-impact delay, and also
incorporates a special friction detonator for graze action.
? FZ-104 M22 incorporates a 0.1- to 0.2-ms post-impact delay, and also
incorporates a special friction detonator for graze action. Possibly, this is a
"superquick" fuze.
Extensive US test results are available concerning Bofors fuze FZ-305 M12, a fuze
employing most of the same internal components as the FZ-104 MI 2, but fired from the
L/60 40-mm antiaircraft gun instead of the L/70 40-mm antiaircraft gun.
(U) Unique Features
Fuze FZ-104 and variants FZ-104 Ml, FZ-104 M2, FZ-104 M12, FZ-104 M22 employ
a pyrotechnic element to ensure delayed arming. All of these fuzes incorporate an efficient
rain safety device designed by Bofors. Models FZ-104, FZ-104 Ml, and FZ-104 M12 employ
a 0.3- to 0.4-ms post-impact delay (labyrinth and pyrotechnic element) to provide enhanced
lethality against thin-skinned targets. Models FZ-104 M12 and FZ-104 M22 incorporate a
special friction detonator to give enhanced graze effectiveness. All models have a reliable
pyrotechnic self-destruct feature and excellent high obliquity functioning.
(U) Characteristics
Fuzes FZ-104, FZ-104 Ml, FZ-104 M2, FZ-104 M12, and FZ-104 M22 are exactly the
same, except for the detonator rotor components and the presence or absence of a special
friction detonator. A detailed analysis of all explosive elements is available in Picatinny
Arsenal Technical Report 4581, November 1973.
Arming method Setback and spin
2-201
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AST-1160H-001-75
Fuze, PDSD, Model FZ-104 and variants FZ-104 MI,
FZ-104 M2, FZ-I04 M12, and FZ-104 M22
1390-19-1-2 (FZ-104)
1390-19-1-2-1 (FZ-104 MI)
FOM Nos. 1390-19-1-2-2 (FZ-I04 M2)
1390-19-1-2-3 (FZ-104 M12)
1390-19-1-2-4 (FZ-104 M22)
(U) Characteristics (Continued)
Original
Firing niethod:
FZ-104 Impact or pyrotechnic self-destruct
FZ-104 M1 Impact or pyrotechnic self-destruct
FZ-104 M2 Impact or pyrotechnic self-destruct
FZ-104 M12 Impact, graze, or pyrotechnic self-destruct
FZ-104 M22 Impact, graze, or pyrotechnic self-destruct
Safety devices
Arming distance
Arming time
Self-destruct tune
Delay time:
FZ-104
FZ-104 M1
FZ-104 M2
FZ-104 M12
FZ-104 M22
Out-of-line detonator
60 m (minimum)
0.06 s (approx)
6.5 to 10.5 s
0.3 to 0.4 ins
0.3 to 0.4 ms
0.1 to 0.2 ms (possibly SQ)
0.3 to 0.4 ms
0.1 to 0.2 ms (possibly SQ)
Fuze assembly:
Body material Aluminum
Weight 55 g (0.121 lb)
Length overall 69.8 mm (2.75 in)
Exposed length 41.4 mm (1.63 in)
Maximum diam 25.4 mm (1.00 in)
2-902
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FOR OFFICIAL USE ONLY
Original AST-1160H-001-75
Fuze, PDSD, Model FZ-104 and variants FZ-I04 MI,
FZ-104 M2, FZ-104 M12, and FZ-104 M22
1390-19-1-2 (FZ-104)
1390-19-1-2-1 (FZ-104 MI)
FOM Nos. 1390-19-1-2-2 (FZ-104 M2)
1390-19-1-2-3 (FZ-104 M12)
1390-19-1-2-4 (FZ-104 M22)
(U) Characteristics (Continued)
Booster:
Body material Aluminum
Body length 183 mm (0.72 in)
Filler material RDX
Filler weight 0.30 g (4.62 gr)
(FOUO) Manufacturers
Bofors is known to produce these fuzes. A West German manufacturer (no firm
information as to manufacturer) is known to produce the FZ-104 M2, redesignated
AZZ DM 91, a West German standard fuze. A Spanish manufacturer, Sociedad Anonima de
Placencia de las Armas, located in Andoain, Spain, is known to produce the FZ-104 M12
and a variant model, FZ-305 M12 (for the L/60 Bofors 40-mm antiaircraft gun). The United
Kingdom is known to use the FZ-104 M12 (UK designated L41A1) and may also produce
the fuze under Bofors license.
Some design features of the FZ-104 and its variants are covered by US patents
3,135,206 ("Fuzes for Projectiles," 2 June 1964) and 3,119,336 ("Fuze for Explosive
Projectile," June 1964), both of which are assigned to Bofors.
(FOUO) Manufacturing Data
(FOUO) The FZ-104 M12 is known to be manufactured by Bofors facilities in
Sweden at the rate of 40,000 per month (1972 figures) using a semiautomated assembly-line
process. Total worldwide production of the FZ-104 and its variants is unknown and is
difficult to estimate due to wide licensing, many variants, and the designation changes which
appear when these fuzes are adopted by a foreign government for its own use.
(U) Cost of the FZ-305 M12 was estimated at $3.07 each in November 1973, with a
reduction to approximately $2.25 each possible if produced in large quantity with a cost
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FOR OFFICIAL USE ONLY
AST-1160H-001-75
Fuze, PDSD, Model FZ-I04 and variants FZ-104 MI,
FZ-104 M2, FZ-104 MI2, and FZ-104 M22
1390-19-1-2 (FZ-104)
1390-19-1-2-1 (FZ-104 MI)
FOM Nos. 1390-19-1-2-2 (FZ-104 M2)
1390-19-1-2-3 (FZ-104 M12)
1390-19-1-2-4 (FZ-104 M22)
Original
(LI) Manufacturing Data (Continued)
reduction program in effect. It can be reasonably assumed that costs of producing the
FZ-104 or its variants would be nearly equal to those of the FZ-305 MU, because the
FZ-104 M12 and FZ-305 M12 are identical internally except for slight differences in the
rain safety device.
(U) US tests established that poor sealant application practices used by Sociedad
Anonima de Placencia de las Armas of Spain resulted in a reliability of only 93% as opposed
to a reliability of better than 99.9% for Bofors-manufactured fuzes.
(U) Functioning (fig 2-76 and 2-77)
SECTION A-A
1 0 01A61
.86 DIAIA
26 TPI
ALL DIMENSIONS IN INCHES
Neg. 507965
(UNCLASSIFIED)
Figure 2-76. Fuze, PDSD, Model FZ-104, contour and section views (U).
2-204
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(This page is UNCLASSIFIED)
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UNCLASSIFIED
Original
(U) Functioning (Continued)
At rest
Neg. 517207
AST-1160H-001-75
Fuze, PDSD, Model FZ-I04 and variants FZ-104 MI,
FZ-I04 M2, FZ-104 MI2, and FZ-104 M22
1 1390-19-1-2 (FZ-104)
1390-19-1-2-1 (FZ-I04 MI)
KIM Nos. 1390-19-1-2-2 (FZ-104 M2)
1390-19-1-2-3 (FZ-104 M12)
1390-19-1-2-4 (FZ-104 M22)
In the bore and in the
trajectory before arming
In the trajectory
atter arming
(UNCLASSIFIED)
Figure 2-77. Fuze, PDSD, Model FZ-104, cutaways of fuze
depicting safe, unarmed, and armed conditions (U).
2-205
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UPILLAbbleltil
AST-1160H-001-75 Original
Fuze, PDSD, Model FZ-104 and variants FZ-104 Ml,
FZ-104 M2 FZ-104 N112, and FZ-104 M22
1390-19-1-2 (FZ-104)
1390-19-1-2-1 (FZ-104 Mi)
FOM Nos. 1390-19-1-2-2 (FZ-104 M2)
1390-19-1-2-3 (FZ -104 M12)
1390-19-1-2-4 (FZ-104 M22)
(U) Functioning (Continued)
Upon firing of the projectile, (kg 2-76) setback forces the setback initiating primer (9)
to the rear against the spring (10). The setback initiating primer is ignited on impact with
the setback firing pin (11). This action takes place in the gun barrel. The setback initiating
primer, in turn, simultaneously ignites the self-destroying powder train (5) and the delay
pellet (2) surrounding the impact firing pin (3). When the delay pellet is consumed, the
spring (4) pushes the impact firing pin upward, unlocking the ball rotor (6). Centrifugal
force moves the rotor, aligning the detonator (12) with the impact firing pin.
Upon impact, the firing pin extension (1) drives the impact firing pin into the
detonator. Post-impact delay is provided by the labyrinth and pyrotechnic delay unit (7)
between the detonator (12) and the relay (8).
If impact docs not occur within the designated time interval, the self-destruction
powder train (5) burns through and activates the detonator, which, after a delay, initiates
the tetryl lead which, in turn, initiates the RDX booster. Figure 2-77 illustrates the fuze
components in safe, unarmed, and armed positions.
In the FZ-104 M12 and FZ-104 M22 variants of the FZ-104, an alternative detonating
action may occur in graze impacts. In these variants, there is an additional friction detonator
built into the plane of the self-destruction powder train but extending also into the next
lower portion of the fuze. This additional friction detonator is adjacent to and just
clockwise from the detonator end of the self-destruction train. The fuze design is such that,
at extreme impact angles (approximately 70? to 80?), the nose portion of the fuze will
break off at the especially weakened joint straddled by the special friction detonator. The
friction detonator, a mixture of 50 mg undextrinated lead azide and 15 mg RDX in an
aluminum cup, detonates due to friction, ignites the normal detonator within the ball rotor,
and detonation of the projectile occurs as previously described.
The post-impact delay elements described above may be altered or eliminated in the
FZ-104 M2 and FZ-104 M22 variants.
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FOR OFFICIAL USE ONLY
Original AST-1160H-001-75
Fuze, PDSD, Model FZ-104 and variants FZ-104 MI,
FZ-104 M2, FZ-104 M12, and FZ-104 M22
1390-19-1-2 (FZ-104)
1390-19-1-2-1 (FZ-104 MI)
FOM Nos. 1390-19-1-2-2 (FZ-104 M2)
1390-19-1-2-3 (FZ-104 M12)
139049-1-2-4 (FZ-104 M22)
(U) Safety Features
The FZ-104, F2-104 Ml, FZ-104 M2, FZ-104 M12, and FZ-104 M22 all have the same
safety features. A ball rotor contains the detonator, and is held out of line by the firing pin
engaged in a niche in the side of the rotor until firing. The firing pin is held in engagement
with the rotor by a delay pellet and a deformable flange.
Transportation safety, handling safety, and delayed arming are ensured by the safety
devices and arming sequence previously described. A rain safety device allows safe firing in
heavy tropical rain.
These fuzes are known to be safe under practically any conditions. The FZ-104 and
FZ-104 M12 have maintained a NATO "Symbol of Interchangeability" for 15 years. This
means that these fuzes have not caused an accident within that time span. Extensive tests by
US experts concluded that these fuzes should be generally safe, although they did not meet
the requirements of some MIL Standards.
(FOUO) Status
(U) Fuzes FZ-104 and FZ-104 M12 carry the NATO "Symbol of Interchangeability"
and thus would be considered favorably for adoption by many NATO nations. It is probable
that both of these fuzes are considered standard in the armed forces of Belgium, Denmark,
Norway, and possibly others.
(U) Sweden almost certainly uses at least one fuze from among the FZ-104 group.
(FOU0) Model FZ 104 M2 was standard in the West German armed forces as
Model AZZ DM 91 at least as late as 1969. It is probably still standard, although Diehl may
be developing a fuze to compete with it.
(U) Model FZ-104 M12 is standard for use in the United Kingdom as Model L41A1.
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FOR OFFICIAL USE ONLY
AST-1160H-001-75 Original
Fuze, PDSD, Model FZ-I04 and variants FZ-104 Ml,
FZ-104 M2, FZ-104 M12, and FZ-104 M22
/1390-19-1-2 (FZ-104)
1390-19-1-2-1 (FZ-104 M1)
FOM Nos. 1390-19-1-2-2 (FZ-104 M2)
1390-19-1-2-3 (FZ-104 M12)
1390-194-2-4 (FZ-104 M22)
(FOUO) Applications (Ammunition and Weapons)
Ammunition
Weapons
40-mm HE-T cartridge, Model SSL/K
(Switzerland); 40-mm HE cartridge,
Model SS/K (Switzerland); 40-mm HE-T
cartridge, Model ?, (Bofors, Sweden);
40x365-mm HEI-T cartridge, Model
SB-LS-Z (West Germany)
40-mm antiaircraft gun,
Model L/70 (Bofors)
(FOLIO) Interchangeability
The Bofors FZ family of PDSD fuzes for antiaircraft guns use a great many parts in
common. An idea of the degree of commonality of parts between any two fuzes in this
family can be obtained by study of the chart "Evolution of Bofors PDSD Fuzes,"
appendix 11 of this manual. It should be noted that the fuzes in this family are also
produced by at least two and probably more non-Swedish manufacturers under Bofors
license, and may carry Bofors or foreign designations. Aside from intra-family fuze parts
interchangeability, the Bofors PDSD fuzes use unique sets of components. Packaging for the
FZ-104 and all its variants is apparently interchangeable.
(U) Packaging
The FZ-104 and all its variants apparently use the same packaging.
Seven fuzes are packed in each sealed cylindrical fuze can. Protective styrofoam spacers
hold the fuzes fixed within the can in a hexagonal pattern with one fuze in the center. A
key is attached to the lid of each can to ensure easy access to the fuzes. Fourteen cans are
packed in each wooden shipping box, for a total of 98 fuzes per box.
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PDSD, Model FZ-I04 and variants FZ-I04 MI,
FZ-104 M2, FZ-104 MI2, and FZ-104 M22
1 1390-19-1-2 (FZ-104)
1390-19-1-2-1 (FZ-104 MI)
FOM Nos. 1390-19-1-2-2 (FZ-104 M2)
1390-19-1-2-3 (FZ-104 M12)
1390-19-1-2-4 (FZ-104 M22)
(U) Packaging (Continued)
Alternatively, the fuzes may be shipped attached to the rounds with which they are to
be fired, as is US practice for 40-mm ammunition.
(U) Test Data
Extensive US test data for the FZ-104 M12 and FZ-305 M12 fuzes are available in
Picatinny Arsenal Technical Report 4581, "Military Potential Test of Fuze, 40-mm,
Antiaircraft, Point Detonating Self-Destroying FZ-305 M12 (Bofors)," by Lloyd D. Post,
November 1973.
2-209
(Reverse Blank)
UNCLASSIFIED
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BLANK PAGE
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UNCLASSIFIED
Or nal
Aflh18flH4C145
Fuze, PD, Model?
FOM No. 1390-19?1-9
STRIKER
FIRING PIN
ARMING BALL
RMING
SLEEVE
ARMING
SPRING
STIRRUP
SETBACK
SLEEVE
DETONATOR
BOOSTER
Net 517129
(UNC.1,ASSIFIEDI
Figure 2-78. flue, PD, Model
2-2 11
UNCLASSIF D
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model?
FOM No. 1390-19-1-9
(U) Description
This simple direct-acting PD fuze (fig 2-78) is armed by setback, deceleration, and
projectile spin by means of a setback sleeve and arming balls. The in-line detonator has no
other safety features. The fuze is not detonator-safe and has only a minimal muzzle-safety
distance. Its design falls far short of meeting current state-of-the-art safety and arming
requirements.
(U) Characteristics
Fuze assembly:
Body material
Weight 19 g (0.042 lb)
Markings
Booster:
Body material
Body length
Explosive
Explosive weight
Functional data:
Arming method Setback, deceleration; spin
Firing method Impact
Safety devices Arming balls
Arming distance est 10-20 cm
Arming time
Self-destruct time
Delay time 7
Frequency (for VT fuze only)
(U) Functioning
2
During storage and shipment, the firing pin is restrained from rearward movement and
contact with the detonator by three steel arming balls. These balls are surrounded by, and
restrained from movement by, a tubular arming sleeve. The arming sleeve is acted upon the
compressed arming spring, but is prevented from moving forward by the bent leading edge
of the stirrup, which in turn is held in position by the tubular setback sleeve that surrounds
these components.
2-212
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PD, Model?
FOM No. 1390-19-1-9
(U) Functioning (Continued)
Upon firing, setback forces cause the setback sleeve to move to the rear, carrying with
it the stirrup. This movement straightens the bent leading edge of the stirrup, releasing the
arming sleeve. Setback forces continue, however, to hold the arming sleeve in position
against the pressure of the arming spring; the arming balls are restrained from movement,
and the fuze remains unarmed as long as acceleration continues.
When the projectile exits the gun muzzle and acceleration ceases, the arming spring
forces the arming sleeve forward. Centrifugal force acts on the arming balls, causing them to
move radially outward into the space previously occupied by the arming sleeve. The firing
pin is now free to move to the rear; creep (deceleration) forces, however, keep it in its
forward position. The fuze is now armed.
Upon impact with a target, the striker drives the firing pin into the detonator,initiating
fuze functioning. The fuze does not have a self-destruct feature.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
20-mm (20x110-mm) HEI cartridge,
Model M-52
20-mm automatic gun, Model L-70
2-213
(Reverse Blank)
UNCLASSIFIED
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UNCLASSIFIED
Original AST-1160H-001-75
LO 20.4!
1.5"-12UNF-
1A(038.1]
049 -03
Neg. 515329
Fuze, PD, Model F8-267
FOM No. 1390-23-1-4
(UNCLASSIFIED)
Figure 2-79. Fuze, PO, Model FB-267, contour view (U).
(U) Description
The FB-267 PD fuze (fig 2-79) is a setback, delayed-arming type designed for SQ or
delay functioning upon impact. It was developed by Fratelli-Borletti of Milan, Italy, for use
2-215
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UNCLASSIFIED
AST?1160H-001-75 Original
Fuze, PD, Model FB-267
FOM No. 1390-23-1-4
(U) Description (Continued)
on fin-stabilized mortar projectiles. The fuze is designed to be bore and muzzle safe. A pull
wire locking all arming components assures safe shipping, handling, and parachute delivery.
The fuze is watertight and is considered reliable in temperatures from -40? to +140?F.
(U) Unique Features
? Escapement mechanism for delay arming.
? Out-of-line detonator housed in a slider.
(U) Characteristics
Fuze assembly:
Body material
Weight 245 g (0.54 lb)
Markings 7
Booster:
Body material
Body length
Explosive
Explosive weight
Functional data:
Arming method Setback
Firing method Impact
Safety devides Safety pin, setback pin, out-of-line detonator
Arming distance 50 m
Arming time 1.2 s
Delay time 0.05 s
Sensitivity tests:*
Superquick Functions on 4-mm paperboard**
Functions 2 to 10 m behind 25-mm
wood target
*Targets located at 200 m from weapon.
**Mullen bursting strength is 39 to 45 kg/cm2 @ 18?C @ 65?2% relative humidity.
2-216
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UNCLASSIFIED
Original
(U) Design Details
20
10
11
12
a
5
24
17
21
25
Neg. 515328 (UNCLASSIFIED)
Figure 2-80. Fuze, PD, Model FB-267,
section view, unarmed position (U).
2-217
UNCLASSIFIED
AST-11608-001-75
Fuze, PD, Model FB-267
FOM No. 1390-23-1-4
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model FB-267
FOM No. 1390-23-1-4
(U) Design Details (Continued)
The fuze (fig 2-80) consists primarily of the upper body (6), lower body (8), and
booster assemblage (9). The upper body (6) is bored out to facilitate the firing-pin assembly,
slider, delay-arming escapement mechanism, inertial plunger, setback pin, and fuze selector.
The firing-pin assembly consists of the striker cup (1), the firing pin (10), and its spring
(11). It is sealed by a plastic cap (20) for protection against water.
The escapement mechanism (19) consists of a gear-pinion arrangement linked to the
rack and spring (18) of the slider (4), containing the SQ detonator (2) and delay detonator
(5). The slider is locked in the unarmed position by the setback pin (21) and its spring (25).
The inertial plunger (7) is locked in safe position by a pull-out wire (24) to assure positive
safety during handling, shipping, and parachuting.
The fuze selector (12) is sealed by an "0" ring (14) and retaining ring (15). The lower
body adapter (8) is threaded internally and externally. The upper body (6) is sealed by a
gasket prior to the lower body (8) being screwed on. The inertial plunger (7) has a central
tube filled with a lead charge (16) of tetryl.
The booster cup (9) with its tetryl booster (22) is screwed into the lower fuze body
(8), completing the assemblage.
(U) Functioning
Upon firing (fig 2-80), setback forces moves the pin (21) rearward, compressing its
spring (25) and locking itself in place. This releases the slider, which moves slowly by the
action of the spring (18), which is delayed by the escapement mechanism (19) via a
pinion-rack arrangement.
Depending on the setting of the selector (12) to "SQ" or delay functioning, either
detonator (2 or 5) will align with the firing pin, as depicted in figure 2-81. Upon impact, the
firing pin stabs the detonator and in turn initiates the tetryl lead charge, booster, and high
explosive filler of the projectile.
2-218
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UNCLASSIFIED
Original AST-1150H-001-75
(U) Functioning (Continued)
Neg. 515330
Fuze, PD, Model FB-267
FOM No. 1390-23-14
11
(UNCLASSIFIED)
Figure 2-81. Fuze, PD, Model FB-267,
section view, armed position (U).
2-219
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model FB-267
FOM No. 1390-23-1-4
(U) Modifications
The slider reportedly has been redesigned. No specifics are available at this time.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
60-mm HE projectiles
81-mm HE projectiles 43A1
120-mm HE projectiles
60-mm mortars
81-mm mortars
120-mm mortars
2-220
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UNCLASSIRED
Original
AST 14S
Fuze, PDSD, Model M4A 7
FOM No, 139 23-1-5
Neg. 507969 (UNCLASSIFIED)
Figure 2-82. Fuze, PDSD, Model M4A7,
full view (U).
2-221
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PDSD, Model M4A7
FOM No. 1390-23-1-5
(U) Description
This fuze (fig 2-82), manufactured by Bombrini Parodi-Delfino (BPD), Rome, was
designed for use with the Bofors 40-mm antiaircraft gun L/70. It was standard in the Italian
Army at least as late as 1969. The internal components of the M4A7 are identical to those
used in the M6. Except for a delay element in the detonator of the M5, the M4A7 and M5
are identical.
M4A7 is an SQ functioning fuze with a pyrotechnic self-destruct element burning 6.5
to 10 seconds from the moment of setback. This fuze should be effective against a light
target. It should function well over a wide range of temperature and humidity conditions. A
minimum number of moving parts are used.
The fuze mechanism is simple, easy to manufacture, safe to handle and transport, and
sensitive. Liberal manufacturing tolerances can be used, while moisture and dust can be
readily sealed out. Tooling costs for this design are minimal with equally modest production
costs.
This fuze was first mass produced in 1958 and is still being produced in quantity.
(U) Unique Features
This fuze uses mass (in the form of balls) instead of a spring to displace the striker
assembly which holds the out-of-line detonator rotor in the safe position. An inexpensive
pyrotechnic element is used to delay arming. Two dctents also hold the detonator rotor in
the safe position until spin releases them. This fuze is rain safe.
(U) Characteristics
Fuze assembly:
Body material Aluminum (?)
Weight 68 g (0.15 lb)
Markings 7
Booster:
Body material
Body length
Explosive
Explosive weight
2-222
UNCLASSIFIED
4.6 mm (0.181n)
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UNCLASSIFIED
Original
(U) Characteristics (Continued)
AST-1160H-001-75
Fine, PDSD, Model M4A7
FOM No. 1390-23-1-5
Physical data (from exploitation):
Overall length 72.6 mm (2.86 in)
Visible length 41.7 mm (1.64 in)
Max diam 28.4 mm (1.12 in)
Thread data:
Max diam 21.8 mm (0.86 in)
Pitch Metric, probably 1 mm
Functional data:
Arming method
Firing method
Safety devices
Arming distance
Arming time
Self-destruct time
Delay time
Spin, pyrotechnical delay
Impact or pyrotechnic (self-destruct)
Out-of-line detonator (rotor) and detent
on striker and rotor
Approx 120-150 m
Approx 0.13-0.17 s
6.5-los
None (SQ)
2-223
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UNCLASSIFIED
AST-116084101-75
Fuze, PDS D, Model M4A7
FOM No. 1390-23-1-5
(U) Functioning (fig 2-83)
1. Closure 10. Washer
2. Nose cap 11. Rotor
3. Pin 12. Rotor housing
4. Primer body 13. Lower fuze body
5. Primer firing pin 14. Booster pellet
6. Striker assembly 15. Booster cup
7. Upper fuze body 16. Closing disk
8. Striker firing pin 17. Primer
9. Detonator 18. Delay element
2.86.86
1.12 DIAM
DIAM
25 TPI
19. Delay and detent housing
20. Striker detent
21. Seal
22. Self-destruct delay
23. Washer
24. Detent balls
25. Firing-pin recess
26. Spring
27. Booster lead
17
19
20
21
22
23
24
25
26
27
Original
ALL DIMENSIONS IN INCHES
Neg. 507968 (UNCLASSIFIED)
Figure 2-83. Fuze, PDSD, Model M4A7, contour and section views (U).
When the projectile is fired, setback acting on the primer body (4) causes the pin (3) to
bend, allowing the primer body to move to the rear and the primer (17) to be driven against
the firing pin (5). The primer initiates the delay element (18) and this, in turn, initiates the
self-destruct element (22). As the delay element burns, spin causes the detent (20) to move
into the space created by the burning delay. When the detent has withdrawn from
engagement with the striker assembly (6), the steel balls (24), acted upon by spin, move
outward along the contour of the cavity forcing the washer (23) and striker assembly (6) to
2-224
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original AST-1 160N101-75
Fuze, PDSD, Model M4A7
FOM No. 1390-23-1-5
(U) Functioning (Continued)
move forward. This action causes the closure (1) of the striker assembly (6) to move against
the inner surface of the nose cap (2). The striker firing pin (8) is withdrawn from the
firing-pin recess (25).
Two rotor detents extend from the rotor housing (12) into recesses in the rotor, one
on each side of the rotor. The detents are held in place by a flat spring (26) formed into a
circle. Spin, acting on these detents, deflects the spring (26), and when the detents and
firing pin (8) have withdrawn from the rotor recesses, two rotor weights cause the rotor
detonator (9) to swing into line with the firing pin (8). The fuze is now armed and will
function upon impact with a target. Upon impact, the nose cap (2) is crushed, driving the
striker assembly toward the rear, causing the firing pin to impinge on the detonator (9). This
action initiates the lead charge (27) which, in turn, initiates the booster (14). The booster
detonation initiates the high explosive within the projectile. if the projectile has not yet
impacted when the self-destruct delay (22) burns out, the self-destruct element, initiated by
the delay element (18) at firing, initiates a detonator within the striker firing pin. This
detonator flashes through holes in the firing-pin wall, initiating the rotor detonator and
causing the projectile high explosive to detonate as previously described.
(U) Safety Features
The striker assembly is initially positioned with the firing pin in engagement with the
rotor, holding the detonator out of line. The striker is held in position by a detent and
chemical (pyrotechnic) delay.
The rotor is locked in position with the detonator out of line by two rotor detents held
in place by a circular leaf spring.
The fuze cannot arm until the projectile has traveled some distance down range
because the chemical delay holds the striker detent in position until it has burned out
sufficiently to provide space for the detent to retreat radially. The steel balls then displace
the striker assembly forward, and finally the rotor must swing into line with the firing pin to
complete the arming cycle.
2-225
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001.75 Original
Fuze, PDSD, Model M4A7
FOM No. 1390-23-1.5
(U) Interchangeability
All internal components used in this fuze are interchangeable with those used in the
M6 fuze. Except for the use of detonators with different chemical compositions, the M4A7
and M5 fuzes are identical and interchangeable.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
40-mm HE cartridge, Model Ml;
40-mm HEI cartridge, Model Ml;
40-mm HE-T cartridge, Model M2;
40-mm HEI-T cartridge, Model M2
40-mm antiaircraft gun,
Model L/70 (Bofors)
(U) Packaging
Normally, the fuzes are shipped attached to the rounds with which they are to be fired.
Whenever the fuzes are shipped separated from the ammunition, a special BPD shipping
box is provided. The same shipping box is used for the M4A7 fuze as is described for
shipping the M6 and M5 fines. For details of this box, see FOM No. 1390-23-1-6 on the M6
fuze.
(U) Test Data
No test data for this fuze are presently held by the US intelligence community;
however, because the internal components used are identical with those of the M6, it is
likely that the performance of the M4A7 will be similar to that of the M6, for which test
data are available. Some performance differences should be expected, however, because the
M4A7 is fired from a weapon (the L/70 gun) with a higher muzzle velocity and different
ballistics from that in which the M6 is fired (the L/60 gun). For a summary of test data on
the M6, see the M6 article elsewhere in this handbook.
2-226
UNCLASSIFIED
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UNCLASSIFIED
Original
Ne, 507970 t UNCLASSIFIED)
Figure 2-84? Fuze, PDSD, Model M6,
contour and section views (U).
2-227
UNCLASSIFIED
AST-11 7
Fuze, POSE), Model M6
FOM No, 1340-23-1-6
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-116014001-75 Original
Fuze, PDSD, Model M6
FOM No. 1390-23-1-6
(U) Description
This fuze (fig 2-84), manufactured by Bombrini Parodi-Delfmo (BPD) of Rome, was
designed for use with the Bofors 40-mm antiaircraft gun L/60. The internal components of
the M6 are identical to those of fuze M4A7, and also, except for the chemical composition
of the detonator, to those of fuze M5. Fuzes M4A7 and M5, both for use with the Bofors
L/70 40-mm antiaircraft gun, use a different body due to being mated with different
ammunition.
M6 is an SQ functioning fuze with a pyrotechnic self-destruct mechanism burning 6.5
to 10 seconds from the moment of setback. This fuze should be effective against a light
target. It should function well under a wide range of temperature and humidity conditions.
A minimum number of moving parts are used.
The fuze mechanism is simple, easy to manufacture, safe to handle and transport, and
sensitive. Liberal manufacturing tolerances can be used, while -moisture and ,dust can be
readily sealed out. Tooling costs for this design are minimal with equally modest production
costs.
In US tests, this fuze functioned reasonably well, although it was considerably less
reliable than the Bofors FZ-305 M12 fuze. Detailed test data are available in Picatinny
Arsenal Technical Report 4257, August 1971, summarized below.
(U) Unique Features
This fuze uses mass (in the form of balls) instead of a spring to displace the striker
assembly which holds the out-of-line detonator rotor in the safe position. An inexpensive
pyrotechnic element is used to delay arming. Two detents also hold the detonator rotor in
the safe position until spin releases them. This fuze is rain safe.
(U) Characteristics
Fuze assembly:
Body material Aluminum (?)
Weight 134 g (030 lb)
Markings
2-228
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UNCLASSIFIED
Original
(U) Characteristics (Continued)
AST-116OH-001-75
Fuze, PDSD, Model M6
FOM No 1390-23-1-6
Booster:
Body material
Body length 4.6 mm (est) (0.18 in)
Explosive
Explosive weight
Physical data (from exploitation):
Overall length 72.9 mm (2.87 in)
Visible length 48.0 mm (1.89 in)
Max diam 32.5 mm (1.28 in)
Thread data:
Max diam 30.0 mm (1.18 in)
Pitch Metric, probably 2 mm
(Model M6/D has thread 1.18-14 NS-2A)
Functional data:
Arming method
Firing method
Safety devices
Arming distance
Arming time
Self-destruct time
Delay time
2-229
Spin, pyrotechnic delay
Impact or pyrotechnic (self-destruct)
Out-of-line detonator (rotor) and detents
on rotor and striker
Approx 120-150 m
Approx 0.13-0.17 s (est)
6.5-10 s
None (SQ)
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-116011101-75
Fuze, PDSD, Model M6
FOM No. 1390-23-1-6
(U) Functioning (fig 2-85)
2.87
.72
L52
1. Closure 10. washer
2. Nose cap 11. Rotor
3. Pin 12. Rotor housing
4. Primer body 13. Lower fuse body
5. Primer Firing pin 14. Booster pellet
6. Striker assembly 15. Booster cup
7. Upper fuze body 16. dosing disk
8. Striker tying pin 17. Primer
9. Detonator 18. Delay element
.03
Neg. 507971
I. DIAM
1.18 DIAM
14 TPI
.81 DIAM
.88 DIAM
56 DIAM
19. Delay and detent housing
20. Striker detent
21. Seal
22. Self-destruct delay
23. washer
24. Detent balls
25. Firing-pin recess
26. Spring
27. Booster lead
ALL DIMENSIONS IN INCHES
17
18
19
20
2!
22
23
?":"
25
26
27
Original
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
(UNCLASSIFIED)
Figure 2-85. Fuze, PDSD, Model M6, contour and section views (U).
When the projectile is fired, setback acting on the primer body (4) causes the pin (3) to
bend, allowing the printer body to move to the rear and the primer (17) to be driven against
the firing pin (5). The primer initiates the self-destruct element (22). As the delay element
burns, spin causes the detent (20) to move into the space created by the burning delay.
When the detent has withdrawn from engagement with the striker assembly (6), the steel
2-230
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UNCLASSIFIED
Original AST-116011-001-75
Fuze, PDSD, Model M6
FOM No. 1390-23-1-6
(U) Functioning (Continued)
balls (24), acted upon by spin, move outward along the contour of the cavity forcing the
washer (23) and striker assembly (6) to move forward. This action causes the closure (1) of
the striker assembly (6) to move against the inner surface of the nose cap (2). The striker
firing pin (8) is withdrawn from the firing-pin recess (25).
Two rotor detents extend from the rotor housing (12) into recesses in the rotor, one
on each side of the rotor. The detents are held in place by a flat spring (26) formed into a
circle. Spin, acting on these detents, deflects the spring (26), and when the detents and
firing pin (8) have withdrawn from the rotor recesses, two rotor weights cause the rotor
detonator (9) to swing into line with the firing pin (8). The fuze is now armed and will
function upon impact with a target. Upon impact, the nose cap (2) is crushed, driving the
striker assembly toward the rear causing the firing pin to impinge on the detonator (9). This
action initiates the lead charge (27) which, in turn, initiates the booster (14). The booster
detonation initiates the high explosive within the projectile. In the event that the projectile
fails to impact prior to burn-out of the self-destruct delay (22), the self-destruct element,
initiated by the delay element (18) at firing, initiates a detonator within the striker firing
pin. This detonator flashes through holes in the ruing-pin wall, initiating the rotor detonator
and causing the projectile high explosive to detonate as previously described.
(U) Safety Features
The striker assembly is initially positioned with the firing pin in engagement with the
rotor, holding the detonator out of line. The striker is held in position by a detent and
chemical (pyrotechnic) delay.
The rotor is locked in position with the detonator out of line by two rotor detents held
in place by a circular leaf spring.
The fuze cannot arm until the projectile has traveled some distance down range
because the chemical delay holds the striker detent in position until it has burned out
sufficiently to provide space for the detent to retreat radially. The steel balls then displace
the striker assembly forward, and finally the rotor must swing into line with the firing pin to
complete the arming cycle.
2-231
UNCLASSIFIED
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UPILLAbbll-ItIJ
AST-11608-00145 Original
Fine, PDSD, Model M6
FOM No. 1390-23-1-6
(U) Interchangeability
All internal components used in this fuze are interchangeable with those used in the
M4A7 fuze, and also, except for the chemical composition of the detonator mechanism,
with the M5 fuze.
(U) Status
This fuze was standard in the Italian Army at least as late as 1960, and standard in the
West Germany Army as Model AZZ DM 121.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
40-mm HE cartridge, Model No. 1
40-mm HEI cartridge, Model No. 1
40-mm HE-T cartridge, Model No. 2
40-mm HEI-T cartridge, Model No. 2
40-mm antiaircraft gun, Model
L/60 (Bofors)
(U) Packaging
Normally, the fuzes are shipped attached to the rounds with which they are to be fired.
Whenever the fuzes are shipped separated from the ammunition, BPD provides a special
shipping box (fig 2-86) holding 500 fuzes, weighing 45 kg (packed) and with dimensions
690x395x350 mm. The case is made of fir wood, with a zinc-coated sheeting liner. Four
trays are packed in the wood box, 125 fuzes to a tray, with each fuze isolated from its
neighbors in every direction by sitting in a hole in the tray. Sheets of 1.5-mm-thick
bituminized cardboard are placed between trays of fuzes in order to isolate the noses of
lower layer fuzes from the bases of those on the next higher layer. The liner sheeting is
tin-soldered at the top edges to ensure an airtight seal. The wooden lid is fixed to the box by
10 screws. Slat-type carrying handles (at different heights to facilitate packing) are attached
to each end of the box.
The same packaging is also used for fuze M4A7 and fuze M5.
2-232
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UNCLASSIFIED
Originel
(LI) Packaging (Continued)
AST-1160H-001-75
Fuze, PDSD, Model M6
EOM No. 1390-23-1-6
Figure 2-86. Fuze, PDSD, Model M6, shipping box },
(LI) Summary of Test Data (from PA Tech Report 4257)
Functioning:
Total function/number tested (excluded
non-functions and low orders)
71192
% Function
1
Reliability at 90% confidence level .. .
68.0
Functioned as intended/number tested
68/92
% Function
74.0
Reliability at 90% confidence level
66.0
Delay arming:
Nominal distance (ft)
467
o (standard deviation)
24.4
2-233
UNCLASSIFIED
(UNCLASSIFIED)
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UNCLASSIFIED
AST-11600-001-75 Original
Fuze, PDSD, Model M6
FOM No. 1390-23-1-6
(U) Summary of Test Data (from PA Tech Report 4257) (Continued)
Self-destruct:
Nominal time (s) 10.08
a (standard deviation) (s) 0.27
2-234
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UNCLASSIFIED
Original
Nie,5167r2 (UNCLASSIFIED)
Figure 287 Fore, PDSD, Model MS,
mull view (U),
2 235
UNCLASSIFIED
A 16DH-00145
Fine,['DSP, Model M5
FOM No. I 390.23-1-9
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PDSD, Model MS
FOM No. 1390-23-1-9
(U) Description
This fuze (fig 2-87), manufactured by Bombrini Parodi-Delfino (BPD) of Rome, was
designed for use with the Bofors 40-mm antiaircraft gun L/70. It is reportedly used by West
Germany, but its present status is unknown. The M5 has a delay after impact function built
into the detonator composition. Except for this post-impact delay, fuze M5 is identical to
fuze M4A7, which is SQ functioning. Fuze M6 uses the same internal components as the
M4A7.
M5 is a short-delay functioning fuze with a pyrotechnic self-destruct element burning
6.5 to 10 seconds from the moment of firing. This fuze should be effective against a light
target. The delay functioning detonator should enhance ammunition effectiveness against
aircraft and unarmored vehicles by allowing some (up to 1 meter) penetration before
projectile detonation. M5 should function well over a wide range of temperature and
humidity conditions. A minimum number of moving parts are used.
The fuze mechanism is simple, easy to manufacture, safe to handle and transport, and
sensitive. Liberal manufacturing tolerances can be used, while moisture and dust can be
readily sealed out. Tooling costs for this design are minimal with equally modest production
costs.
(U) Unique Features
A pyrotechnic post-impact delay element in the detonator assembly should provide
enhanced effectiveness.
Mass (in the form of balls) is used instead of a spring to displace the striker assembly
which holds the out-of-line detonator rotor in the safe position. An inexpensive pyrotechnic
element is used to delay arming. Two detents also hold the detonator rotor in the safe
position until spin releases them. This fuze is rain safe.
(U) Characteristics
Fuze assembly:
Body material Aluminum (?)
Weight 68 g (0.15 lb)
Markings
2-236
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UNCLASSIFIED
Original
(U) Characteristics (Continued)
Booster:
Body material
Body length 4.6 mm (0.18 in)
Explosive
Explosive weight
7
7
Physical data:
Overall length 72.6 mm (2.86 in)
Visible length 41.7 mm (1.64 in)
Max diam 28.4 mm (1.12 in)
AST-11601-001-75
Fuze, PDSD, Model M5
FOM No. 1390-23-1-9
Thread data:
Max diam 21.8 mm (0.86 in)
Pitch Metric, probably 1 mm
Functional data:
Arming method
Firing method
Safety devices
Arming distance
Arming time
Self-destruct time
Delay time
2-237
Spin, pyrotechnic delay
Impact or pyrotechnic (self-destruct)
Out-of-line detonator (rotor) and decent
on striker and rotor
120-150 m (est)
0.13-0.17 s (est)
6.5-10 s
Approx 0.0005 s
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST?1160 H-001 -75
Fuze, PDSD, Model M5
FOM No. 1390-23.1-9
(U) Functioning (fig 2-88)
1 Closure
2. Nose cap
3 Pin
4 Primer body
3 Primer firing pin
6 Striker assembly
7 Upper fuze body
8. Striker firing pin
9 Derunator
10. Washer
11 Rotor
12 Rotor housing
13 Lower fuze body
14. Booster pellet
15 Booster cup
16. Closing disk
17. Primer
18. Delay element
19. Delay and detent housing
20. Striker detent
21. Seal
22. Self-destruct delay
23. Washer
24. Detent balls
25 Firing-pin recess
26 Spring
27. Booster lead
11
DELAY
COMPOSITION
Neg. 516774
(UNCLASSIFIED)
Figure 2-88. Fuze, PDSD, Model MS, section view (U).
2-238
UNCLASSIFIED
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Original
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original
(U) Functioning (Continued)
AST-1160 H-001-75
Fuze, PDSD, Model M5
FOM No. 1390-23-1-9
When the projectile is fired, setback acting on the primer body (4) causes pin (3) to
bend, allowing the primer body to move to the rear and the primer (17) to be driven against
the firing pin (5). The primer initiates the delay element (18) and this, in turn, initiates the
self-destruct element (22). As the delay element burns, spin causes the striker decent (20) to
move into the space created by the burning delay. When the detent has withdrawn from
engagement with the striker assembly (6), the steel balls (24), acted upon by spin, move
outward along the contour of the cavity forcing the washer (23) and striker assembly (6) to
move forward. This action causes the closure (1) of the striker assembly (6) to move against
the inner surface of the nose cap (2). The striker firing pin (8) is withdrawn from the
firing-pin recess (25).
Two rotor detents extend from the rotor housing (12) into recesses in the rotor, one
on each side of the rotor. The detents are held in place by a flat spring (26) formed into a
circle. Spin, acting on these detents, deflects the spring (26) and when the detents and firing
pin (8) have withdrawn from the rotor recesses, two rotor weights cause the rotor detonator
(9) to swing into line with the firing pin (8). The fuze is now armed and will function upon
impact with a target. Upon impact, the nose cap (2) is crushed, driving the striker assembly
toward the rear, causing the firing pin to impinge on the detonator (9). This action initiates
the lead charge (27) which, in turn, initiates the booster (14). The booster detonation
initiates the high explosive within the projectile. If the projectile has not yet impacted when
the self-destruct delay (22) burns out, the self-destruct element initiated by the delay
element (18) at firing initiates a detonator within the striker firing pin. This detonator
flashes through holes in the firing-pin wall, initiating the rotor detonator and causing the
projectile high explosive to detonate as previously described.
(U) Safety Features
The striker assembly is initially positioned with the firing pin in engagement with the
rotor, holding the detonator out-of-line. The striker is held in position by a detent and
chemical (pyrotechnic) delay.
The rotor is locked in position with the detonator out-of-line by two rotor detents held
in place by a circular leaf spring.
2-239
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-11130H-001-75 Original
Fuze, PDSD, Model M5
FOM No. 1390-23-1-9
(U) Safety Features (Continued)
The fuze cannot arm until the projectile has traveled some distance down range
because the chemical delay holds the striker detent in position until it has burned out
sufficiently to provide space for the detent to retreat radially. The steel balls then displace
the striker assembly forward, and finally the rotor must swing into line with the ruing pin to
complete the arming cycle.
(U) Interchangeability
This fuze employs a delay element in the detonator composition. Except for this delay,
fuze M5 is identical to fuze M4A7. All M5 internal components except the delayed
detonator are also interchangeable with those used in fuze M6.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
40-mm HE cartridge, Model Ml;
40-mm HEI cartridge, Model MI;
40-mm HE-T cartridge, Model M2;
40-mm HEI-T cartridge, Model M2
40-mm antiaircraft gun,
L/70 (Bofors)
(U) Packaging
Normally, the fuzes are shipped attached to the rounds with which they are to be fired.
Whenever the fuzes are shipped separated from the ammunition, BPD provides a special
shipping box. Identical boxes are used for shipping M4A7, M5, and M6 fuzes, 500 to a box.
For a detailed description and photography of this packaging, see the section on fuze M6 in
this study.
(U) Test Data
No test data for this fuze are presently held by the US intelligence community. Test
data for the similar fuze M6 may not be applicable to the M5 because the delay-after-impact
element in the M5 could affect performance adversely.
2-240
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UNCLASSIFIED
Original
i
AST-116811-00145
Fuze, PD, Model 225A
FOM No. 1390-23-2-2
ARMED POSITION
Neg. 551860 (UNCLASSIFIED) Neg. 551861 (UNCLASSIFIED)
Figure 2-89. Fuze, PD, Model 225A, section views of unarmed and armed positions (U).
(U) Description
The Model 225A fuze (fig 2-89 and 2-90) is a setback, delayed-arming fuze designed
for instantaneous and graze functioning upon impact. It was developed by Fratelli Borletti
of Milan, Italy, for use with the XM151 2.75-inch airborne rockets. External shape and
dimensions are similar to US fuzes M423 and XM427E1.
2-241
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UNCLASSIFIED
AST-116011-001-75 Original
Fuze, PD, Model 225A
FOM No. 1390-23-2-2
(U) Unique Features
? "V"-shaped nose cap for graze functioning.
? Escapement to control or delay the arming.
? Slider housing out-of-line detonator.
(U) Characteristics
Fuze assembly:
Body material 7
Weight
Markings FB 225A
Booster:
Body material
Body length
Explosive
Explosive weight
Functional data:
Arming method Setback
Firing method Impact
Safety devices
Arming distance
Arming time
*Pull wire, locking pin, and out-of-line detonator.
2-242
UNCLASSIFIED
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PD, Model 225A
FOM No. 1390-23-2-2
(U) Design Details (figs 2-89 and 2-90)
The FB 225A is a three-piece design consisting of a nose cap, upper body section, and
lower body section. The nose cap has an internally truncated "V"-shape cutout to permit
the striker assembly (1) and inertial plunger (6) to be cammed when the projectile grazes the
ground upon impact.
The striker assembly (1) includes a striker head, setback spring, and firing pin. The
spring-loaded slider (3,2) houses an out-of-line detonator (4). The movement of the slider
(2) is controlled by the clockwork mechanism (M).
The safety system consists of locking pin (7), locking-pin spring (9), and pull wire (8).
The explosive train includes the detonator (4), a columnar lead charge (5), a relay, and
a booster. The booster assembly screws into the base of the lower body section of the fuze.
(U) Functioning
Prior to firing, the safety pin (8) is removed (see fig 2-89). Upon firing, acceleration of
the rocket causes the locking pin (7) to move rearward, compressing its spring and
undetenting the slider (2), which is pushed into the armed position by its spring (3). This
movement is delayed by the clockwork (M) (see fig 2-89). When the clockwork runs down,
the detonator (4) aligns itself with the striker (1) and the columnar lead charge. The fuze is
now armed.
Upon impact (see fig 2-90) with no-graze action, the nose cap (10) drives the striker
into the detonator (4), initiating the lead charge (5) and in turn the relay charge (11) and
booster (12). In the event the striker does not function the detonator, the inertial plunger
(6) simultaneously drives the detonator into the striker. Upon impact with graze action, the
nose cap (10) cams the striker (1) and the inertial plunger pushes the detonator (4) into the
striker (1), initiating the lead charge (5) and in turn the relay charge (11) and booster (12).
2-243
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UNCLASSIFIED
AST-11608-001-75
Fine, PD, Model 225A
FOM No. 1390-23-2-2
(U) Design Details (Continued)
1
12
Original
IMPACT POSITION I NO GRAZE ACTION 1 IMPACT POSITION I GRAZE ACTION )
Neg. 551863 (UNCLASSIFIED) Neg. 551862
(UNCLASSIFIED)
Figure 2-90. Fuze, PD, Model 225A, impact position, no-graze and graze actions (U).
2-244
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UNCLASSIFIED
Original AS71160E1-001-75
Fuze, PD, Model 225A
FOM No. 1390-23-2-2
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
2.75-in HE rockets, Model XM151
2.75-in rocket launchers
2-245
(Reverse Blank)
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BIM PAU
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UNCLASSIFIED
Original
(UNCLASSIFIED)
Figure 2-91. Fuze, PD, Model 53,
2-347
AST-11500-00145
Fuze, PD, Model 53
FOM No. 1390-244-2
(UNCLASSIFIED)
cutaway views (U).
UNCLASSIFIED
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model 53
FOM No. 1390-24-1-2
(U) Description
The Model 53 (fig 2-91) is a setback-armed PD fuze designed for instantaneous action
upon impact. It was designed by Esperanza Y CIA, S.A. of Marquina, Spain, for use with
mortar projectiles of any caliber.
(U) Unique Features
? Eccentric weight ball rotor containing out-of-line detonator.
? Safety wire locking setback sleeve.
? Two balls detenting the ball rotor.
(U) Characteristics
Fuze assembly:
Body material Brass
Weight 225 g? (0.50 lb)
Markings Model 53
Length 114.5 mm (4.51 in)
Thread diam 22.3 mm (0.88 in)
TPI 13
Booster:
Body material Brass
Body length 51 mm (2.01 in)
Explosive Tetryl ?
Explosive weight 7
Functional data:
Arming method Setback
Firing method Impact
Safety devices
Arming distance 5 meters
Arming time
*Safety wire locking setback sleeve and detcnt on ball rotor horizon out-of-line detonator.
2-248
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UNCLASSIFIED
(U) 1)esign Details
BETAlk
AST-1160H-001-75
Foie, PI), Model 53
FONT No. 1390-24-1-2
(L1'LLASSIF
Figure 2-92. Fuze PD Model 53, exploded view (U).
2-249
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model 53
FOM No. 1390-24-1-2
(U) Design Details (Continued)
(U) The fuze (fig 2-92) consists of a striker assembly, upper fuze body, lower fuze body,
and booster assemblage. The forward end of the upper fuze body is threaded externally and
bored out to facilitate assembly of the striker. The striker consists of an aluminum striker
head, steel coil spring and firing pin which is locked in position by a retainer nut forming
the striker assembly. The rearward portion of the upper fuze body is hollowed out to house
the eccentrically weighted ball rotor containing the out-of-line detonator. In addition, the
upper fuze body is threaded internally to receive the lower fuze body.
The lower fine body is threaded externally for screwing onto the projectile and
internally to facilitate assembly of the booster. The lower fuze body houses the weighted
setback sleeve, two detent balls, the setback spring and spring-loaded release pin which
engages a flat surface of the ball rotor and a brass flash tube for assembly into the booster
assembly. A safety pin, inserted through a transverse opening through the lower fuze body
and setback sleeve, provides additional safety.
2-250
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PD, Model 53
FOM No. 1390-24-1-2
(U) Functioning (fig 2-93)
Neg. 516492
(UNCLASSIFIED)
Figure 2-93. Fuze, PD, Model 53, section view (U).
2-251
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model 53
FOM No. 1390-24-1-2
(U) Functioning (Continued)
Prior to firing, the safety pin is removed.
Upon firing, setback forces move the weighted setback sleeve (1) rearward,
compressing its spring (2); this in turn frees the two detent balls (3) which fall into the
cavity (4) of the lower fuze body. The eccentric weighted ball rotor (5) is now free to move.
As setback forces dissipate, the setback sleeve (1) moves forward by expansion of its
spring (2) and rests on a shoulder (6) of the lower fuze body.
The eccentrically weighted ball rotor as a result of its mass and the help of a
spring-loaded release pin (7) rotates 90?, arming the fuze. The detonator (8) is now in line
with the firing pin (9).
Upon impact, the striker head (10) forces the firing pin (9) against its spring (11),
stabbing the detonator (8) which in turn flashes through the flash tube (12), initiating the
booster (13) and resulting in detonation of the high explosive projectile.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
60-mm projectiles
81-mm projectiles
60-mm mortar
81-mm mortar
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Original
UNCLASSIFIED
AST1160H-001 7
Fuze, PD, Model D
FOM No. 1390-24e1-3
NCLASS
Figure 2-94. Fuze, PD, Mod
UNCLASSIF D
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model D
FOM No. 1390-24-1-3
(U) Description
The Model "D" PD fuze (fig 2-94) is a setback-armed type designed for either
instantaneous or delay action upon impact. It was developed by Esperanza Y CIA, S.A. of
Marquina, Spain, for use with mortar projectiles.
(Li) Unique Features
? Employs a visual and touch needle which tells you the fuze is armed.
? Employs a plastic safety cap and steel pin.
? Employs a spring-loaded slider detented by a unique arming mechanism.
(U) Characteristics
Fuze assembly:
Body material Anodized aluminum
Weight 212 g (0.47 lb)
Max body diam 48.7 mm (1.92 in)
Length (overall) 94.5 mm (3.72 in)
Thread diam 37.5 mm (1.48 in)
TPI 12
Booster:
Body material Anodized aluminum
Body length 20 mm (0.79 in)
Body diam 27.7 mm (1.09 in)
Explosive Tetryl ?
Explosive weight
Functional data:
Arming method Setback
Firing method Impact
Safety devices Safety cap, safety pin detent on slider
Arming distance 40 m
Arming time 1.2 s
Delay time
2-254
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UNCLASSIFIED
Original
(U) Design Details
AST-1160)1-001-75
Fuze, PD, Model D
FOM No. 1390-24-1-3
2.
28
1
10
16
24
22
25
UNARMED POSITION
Neg. 516920
. ARMED POSTION
Figure 2-95. Fine, PD, Model D, section view (U).
(UNCLASSIFIED)
The fuze (fig 2-95) consists of the firing-pin assembly, fuze body, and booster
assemblage. The conical-shaped fuze body (17) is threaded internally to facilitate assembly
of the booster assembly (26) and externally for securing the firing-pin assembly. The
firing-pin assemblage consists of the striker head (20), coil spring (29), and a cylinder (15),
housing the piston (11), silicone charge (10), and firing pin (30).
The hollow cylinder (15) and the piston (11) are recessed out to hold the decent ball
(8). The hollow cylinder has a hole drilled longitudinally for positioning of a needle (9),
which acts as visual and touch-type indicator when the fuze is armed. The striker head (20)
is secured by a retainer nut (21), forming the nose portion of the fuze.
2-255
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model D
FOM No. 1390-24-1-3
(U) Design Details (Continued)
The arming mechanism, housed in the fuze body, consists of the detent ball (8),
weighted setback sleeve (14), setback spring (4), piston (11), cylinder (15), silicone charge
(10), and firing pin (30), which detents the spring-loaded slider housing the instantaneous
detonator and the delay detonator (7).
The slider assembly consists of a spring (6), slider block (5), and guide pin (2). There
are two transverse openings in the fuze body (17) 90? apart; one is totally enclosed and is
designed to facilitate the slider (6,5), and the other smaller one is provided with a guide pin
(2) which abuts onto the slider. The slider (6,5) is sealed by the setting plug (22), with a ring
washer to prevent moisture from entering.
The setting plug (22) is provided with a slot on the outside to facilitate fuze setting to
either delay or instantaneous action. The end of the pin (2), which is pressure fitted inside
the fuze body (17), juts out and fits into an axial groove in the side of the slider (6,5)
allowing the slider to be guided properly when forced to move by its spring (6).
On the cylinder (15), a conical sleeve (1) is fitted. This has been cut longitudinally to
permit slightly separated and projecting strips, which act as a clip. When the weighted
setback sleeve (14) is forced rearward during firing, it latches onto the conical sleeve (1) and
on set forward takes the cylinder (15) with it.
A silicone charge (10) is positioned inside the cylinder (15); above it a piston (11) is
held in place by a washer (19) and retainer nut (21). The silicone, when compressed by
action of the spring (4), is forced out of small holes in the base of the charge. This produces
a time lag for trajectory safety before the slider is released for arming the fuze.
(U) Functioning (fig 2-95)
Prior to firing, the safety cap (28) and safety pin (18) are removed. Upon firing,
setback forces the weighted setback sleeve (14) rearward, compressing the spring (4) until it
is clipped onto the cylinder (15) by means of the strips of the sleeve (1), thereby releasing
ball (8).
Upon dissipation of setback forces, the spring (4) expands, moving the cylinder (15)
forward. Overcoming the resistance afforded by the silicone charge (10), the silicone is
2-256
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PD, Model D
FOM No. 1390-24-1-3
(U) Functioning (Continued)
forced out through openings in the base of the charge holder. This permits a time delay for
trajectory safety.
The cylinder continues to advance, moving the firing pin with it and undetenting the
slider (6,5). The slider (6,5), by virtue of its spring (6), moves either the delay detonator (7)
or the instantaneous detonator, depending on fuze setting, in line with the firing pin.
Upon impact, the striker head (20) compresses the spring (29), pushing the cylinder
(15) rearward and causing the firing pin (30) to stab the detonator which flashes through
one of the flash channels (3), depending on the fuze setting, initiating the booster (27) and
in turn the main charge of the projectile.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
60- and 81-mm projectiles
60- and 81-mm mortars
2-257
(Reverse Blank)
UNCLASSIFIED
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BLANK PAGE
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CONFIDENTIAL
Original
AST-1160H-001-15
Fuze, PD, Model L35A1
FOM No. 1390-35-1-17
CLEAR PLASTIC
WIND SCREEN
ALUMINISE
COLOR
NOTES
A.
BODY BLUR COLOR
SLOT
THREADS
ALUMINUM COLOR
RUBBER SEAL
BOOSTER
GOLD COLOR
ENGRAVED ON RIGHT SIDE DE FUZE BOGY USA'
IS OF ITV
B HOLE APPROXIMATELY vir ONCE) DIAMETER DRILLED
IN LEFT SIDE OF FUZE BODY
Neg. 515356 (UNCLASSIFIED) Neg. 515361
(UNCLASSIFIED)
Figure 2-96. Fuze, PD, Model L35A1, full and contour views (U).
(C) Description
The UK L35A1 PD fuze (fig 2-96) is a setback, delayed-arming type designed for either
SQ or delayed action. It is intended for use with the UK Ll5A1 81-mm high explosive
mortar projectile. The L35A1 is a copy of the Oerlikon RKVDIR-0264 PD fuze.
(C) Unique Features
? This fuze features a delayed-arming mechanism similar to that used in US
SQ and delay fuzes. The runaway-type escapement, called a clutter
escapement by the United Kingdom, provides trajectory safety.
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CONFIDENTIAL
AST-1160H-001-75
Fuze, PD, Model L35A1
FOM No. 1390-35-1-17
(C) Unique Features (Continued)
? A unique detent system as well as a safety pin provides additional safety.
(C) Characteristics
Fuze assembly:
Head material
Body material
Weight
Markings
Total length
Visible length
Max diam
Explosive weight
Threat count
Functional data:
Arming method
Firing method
Safety devices
Aluminum
Cadmium-plated steel
575 g (1.27 lb)
L35A 1
150 mm (5.91 in)
86 mm (3.39 in)
61 mm (2.40 in)
34 g (0.075 lb)
12 TP1
Setback
Impact
Escapement-slider, locking bolt, detent balls,
and safety pin
25m
0.9 s
0.05 s
Arming distance
Arming time
Delay time
Original
Sensitivity:
SQ action Functions on 4-mm cardboard target.
Delay action Less than SQ action
2-260
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Original
(C) Design Details
STRIKER HEAD
POLYTHENE NOSE CAP
STRIKER CARRIER
DIRECT ACTION STRIKER
CONFIDENTIAL
AST-1160H-001-75
Fuze, PD, Model L35A1
FOM No. 1390-35-1-17
FUZE HEAD
DIRECT ACTION
STRIKER SPRING
FUZE BODY
ESCAPEMENT COVER
CLUTTER ESCAPEMENT
GEARS
VIEW OF SHUTTER
PIN AND SPRING
SETTING BOLT
SET AT "SO"
SHUTTER GUIDE
DIRECT ACTION
DETONATOR
SAFETY PIN
SHUTTER
SEALING PIN
DOUBLE DETENT
SUBASSEMBLY
OUTER DETENT
SPRING
DETENT SPRING
SPACER
STEMMED PELLETS
INTERMEDIATE PELLET
DELAY ACTION
DETONATOR
ARMING BUSH
DELAY STRIKER
DELAY STRIKER
SPRING
GUIDE BUSH
STOP BOLT
MAGAZINE DISC
MAGAZINE
PELLET
PAPER DISC
VIEW OF DELAY
STRIKER SUBASSEMBLY
AND DELAY DETONATOR
Neg. 515360 (CONFIDENTIAL)
Figure 2-97. Fuze, PD, Model L35A1, section view (U).
2-261
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CONFIDENTIAL
MT-1160H-001-75 Original
Fuze, PD, Model L35A1
FOM No. 1390-35-1-17
(C) Design Details (Continued)
The L35A1 fuze (fig 2-97) consists of a nose, body, and magazine (i.e., booster)
assemblage. The body assembly forms the major portion of the fuze and contains the
following:
? Clutter escapement consisting of brass gears on a steel shaft, balance
wheel, and its aluminum cover.
? Friction-loaded setting bolt mechanism for controlling the function
desired.
? Shutter (i.e., slider) guide assembly consisting of shutter, shutter pin, two
primer-detonators, and spring.
? A detent system (i.e., inner and outer detent mechanism) and safety pin.
? Delay striker (i.e., firing pin) mechanism.
? CE stemming (i.e., tetryl relay charge).
The magazine (i.e., booster) assembly consists of a cylindrical aluminum casing, closed
at one end and internally screw-threaded at the open end, an explosive pellet of CE (i.e.,
tetryl), and polythene and paper disks. Assembly of the magazine to the fuze body is
effected by the magazine being screwed onto the lower portion of the fuze body to form
the base of the fuze.
The nose assembly comprises an aluminum fuze head housing, the direct action striker
(i.e., SQ firing pin) assembly. This is also made of aluminum except for the steel striker (i.e.,
firing pin) spring and a snap-on polythene (i.e., polyethylene) nose cap. The fuze head is
externally screw threaded and is assembled by screwing into the forward end of the fuze
body to form the leading portion of the fuze.
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CONFIDENTIAL
Original AST-1160H-00145
Fuze, PD, Model L35A1
FOM No. 1390-35-1-17
(C) Safety Arrangements
Before firing (safety pin in position):
? The safety pin locks the outer detent in the safe position.
? The shutter (i.e., slider) carrying the two primer-detonators is locked in a
safe position by the double detent mechanism. With the shutter in this
position, the accidental firing of a primer-detonator would not cause the
fuze to function.
? Accidental depression of the striker head would cause the delay action
striker to enter an empty recess in the shutter while the base of the
shutter prevents any forward movement of the free elements in the delay
striker mechanism.
After firing (safety pin removed):
? The clutter escapement controls the shutter movement and prevents it
from reaching the armed position too quickly.
? The delay-action striker is held away from the primer-detonator by its
spring until the spring is overcome by the force upon impact.
? In case of a premature deceleration of the fuze caused by striking overhead
foliage or camouflage netting, the delay striker mechanism starts
functioning; however, because of the shutter movement being controlled
by the escapement mechanism, the free element of the delay striker
mechanism on moving forward will enter a blind recess in the base of the
shutter. This forward movement of the free element prevents further
movement of the shutter, resulting in a dud.
(C) Functioning
The fuze is designed to operate with either SQ or delay functions. Before firing, the
setting bolt is set to the required function, and the safety pin pulled out. The polythene
nose cap remains in place.
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CONFIDENTIAL
AST-1160H-001-75 Original
Fuze, PD, Model L35A1
FOM No. 1390-35-1-17
(C) Operation of Fuze Set SQ?Safety Pin Removed
On firing, the inner detent immediately starts to setback. The outer detent is prevented
from moving to the setback position by the locking balls. The setback movement of the
inner detent continues and brings its tapered portion opposite the locking balls so that they
have space to move inwards. As the action proceeds, the locking balls eventually clear the
detent retaining sleeve, and the outer detent becomes free to setback. Eventually, both
detents are in the setback position.
As flight deceleration commences, the inner detent, being of lighter mass, reasserts
faster than the outer decent, and its taper pushes the locking balls outwards. When the outer
detent starts to reassert, the locking balls butt against the rear shoulder of the detent
retaining sleeve. The double detent mechanism is now held in the setback or armed position.
When the double detent mechanism moves to the setback position, it is clear of, and
releases, the shutter. The shutter, under constant pressure from the shutter spring, starts to
slide to the armed position. The rack on the shutter turns the drive shaft and operates the
clutter escapement. The clutter escapement controls the speed of movement of the shutter,
the shutter eventually arrives in the armed position, and the SQ detonator is directly in the
line of travel of the striker point.
On nose impact, the SQ striker is driven onto the SQ detonator which ignites and
initiates the pellet in the shutter. The explosive reaction of the pellet in the shutter is
focused through a specially formed septum to give the maximum effect through the
stemming closing cup onto the stemming in the fuze body. The stemming detonates the
magazine pellet, and the fuze functioning is complete.
If, on impact, the desired SQ action does not operate (e.g., a graze hit on target), the
delay function described in the following paragraph is still capable of initiating the explosive
train at delay conditions.
(C) Operation of Fuze Set D?Safety Pin Removed
On firing, the double detent and shutter mechanisms operate as described in the
previous paragraph.
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CONFIDENTIAL
Original AST-115011-001-75
Fuze, PD, Model L35A1
FOM No. 1390-35-1-17
(C) Operation of Fuze Set 13?Safety Pin Removed (Continued)
On nose impact, the SQ striker is driven onto the setting bolt, either bending or
breaking loose, and is prevented from striking the SQ detonator.
The sudden deceleration of the fuze at impact causes all the free components inside to
move forwards. Thus the guide bush and the arming bush in the delay striker mechanism
slide forward in unison. There is no gap between their adjacent surfaces. At this instant, the
delay striker is locked in position by the stop bolt and stop-bolt balls. The stop-bolt balls are
retained in the locking position by the guide bush.
When deceleration is almost complete, the guide bush is pushed backwards away from
the arming bush by the delay striker spring. The gap now created allows the stop-bolt balls
to move outwards consequent to pressure from the delay striker and against the taper on the
stop bolt. Immediately the stop bolt balls clear the stop bolt the striker plunges forward
under pressure from the delay striker spring and ignites the delay detonator.
The delay detonator causes the SQ detonator to function by the effect of the reaction
through the thin walls separating the two detonators. The walls are compositely thin enough
to act as a septum. A flash channel from the delay detonator to the SQ detonator is
provided in the shutter guide as an additional means of assistance in take-over. The SQ
detonator now continues the explosive reaction, and functioning of the explosive train is
completed as described in the previous paragraph.
(C) Applications (Ammunition and Weapons)
Ammunition
Weapons
81-mm HE projectile, Model
L15A1; 81-mm smoke (WP)
projectile, Model L19A3
81-mm mortar, Model L16
2-265
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AST-116011-001-75 Original
(This page intentionally left blank)
2-266
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UNCLASSIFIED
Original AST-1160H-001-75
LEAF SPRING
BAFFLE
DETONATOR
Fuze, PD, Model 944 Mk 1
FOM No. 1390-35-1-32
NOSE COVER
STRIKER
FIRING PIN
RETAINING TAB
LOCKING BOLT
ROTOR
BOOSTER
(U) Description
DELAY PELLET
LOWER DETONATOR
Figure 2-98. Fuze, PD, Model 944 Mk 1 (U).
(UNCLASSIFIED)
The No. 944 Mk 1 PD fuze (fig 2-98) is used with the 30x113-rnm B Mk5 HE cartridge
in the ADEN aircraft gun. Its uncomplicated design utilizes two locking bolts to secure the
firing pin and a ball rotor containing an out-of-line detonator and a delay element. The fuze
has no self-destruct feature.
2-267
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UNCLASSIFIED
AST-116014-001-75 Original
Fuze, PD, Model 944 Mk 1
FOM No. 1390-35-1-32
(U) Characteristics
A sheet-metal nose cover is crimped to a groove in the fuze body. The steel fuze body
contains a firing pin restrained in the unarmed position by two locking bolts, themselves
retained in position by sheet-metal tabs. A ball rotor containing a detonator and a delay
pellet is held out of line with the firing pin and booster by a leaf spring. A tetryl-filled
booster cup closes the base of the fuze.
Fuze assembly:
Body material Steel
Weight 2
Markings 944 Mk 1
Booster:
Body material Aluminum alloy
Body length 7
Explosive Tetryl
Explosive weight 2.1 g (32.3 gr)
Functional data:
Arming method Spin
Firing method Impact
Safety devices Safety bolts, out-of-line, rotor-mounted
detonator
Arming distance 2 to 3 m
Arming time 3 to 4 ms
Self-destruct time a
Delay distance after impact 230 to 760 mm
(U) Functioning
Upon firing, setback force acts on the striker, firing pin, and locking bolts to restrain
the bolts from moving radially outward under the influence of centrifugal force. When
setback ceases, centrifugal force causes the locking bolts to move outwards, forcing open the
retaining tabs. When the bolts are completely withdrawn, the tabs spring into grooves in the
locking bolts to prevent the latter from slipping back and impeding the firing pin. At this
point the firing pin is free to move, but deceleration (creep) forces keep it in its forward
position.
2-268
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UNCLASSIFIED
Original AST-1160H-001-M
Fuze, PD, Model 944 Mk 1
FOM No. 1390-35-1-32
(U) Functioning (Continued)
Simultaneously with the above, setback forces acting on the leaf spring hold it against
the rotor to keep the latter from moving. Centrifugal force increases until it overcomes the
combined force of setback and spring tension, causing the free end of the spring to move
outward and thus free the rotor. The spinning rotor now moves until the detonator and
delay column are in line with firing pin and booster. The positioning of the rotor takes
several milliseconds, which insures that the projectile has moved an estimated 2 to 3 meters
from the barrel before the fuze becomes armed. -
Upon impact, the fuze nose is crushed, and the firing pin initiates the detonator. The
flash from the detonator passes a baffle and ignites a delay pellet. After a brief delay that
enables the projectile to penetrate the target, the delay pellet initiates a lead-azide lower
detonator that in turn initiates the booster and the high explosive projectile filler.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
HE cartridge, Model Mk 5
30x113-mm aircraft gun, ADEN
2-269
(Reverse Blank)
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UNCLASSIFIED
Original
AST-1100H-001-75
Fuze, PD, Model M2
FOM No. 1390-37-1-2
Neg. 516418 (UNCLASSIFIED)
Figure 2-99. Fuze, PD, Model M2, section view (U).
2-271
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UNCLASSIFIED
AST-1160E1-001-75 Original
Fuze, PD, Model M2
FOM No. 1390-37-1-2
(U) Description
The M2 fuze (fig 2-99) is a setback-armed PD type developed by Soltam, Ltd., of
Haifa, Israel. It is of tuned construction designed to provide rough handling, detonator
safety, and trajectory safety. It is intended for use with 60-mm mortar projectiles.
(U) Unique Features
The M2 features a spring-loaded slider held in the out-of-line position by a sleeve and
decent ball. Other safety features include a safety cap and pin.
(U) Characteristics
Fuze assembly:
Body material 7
Weight
Markings 7
Booster:
Body material 7
Body length
Explosive
Explosive weight
Functional data:
Arming method Setback
Firing method Impact
Safety devices Safety pin and cap, detent sleeve and ball
Arming distance
Arming time 7
(U) Functioning (fig 2-99)
The fuze is unable to function as long as the detonator (1) is not aligned with the firing
pin (9). The spring-loaded slider (8,4) is detented by the setback sleeve (2) and its spring (6)
as well as the check ball (5). The safety pin (3) provides additional safety to assure the slider
will not move.
2-272
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PD, Model M2
FOM No. 1390-37-1-2
(U) Functioning (Continued)
Just before firing, safety pin (3) and cap (7) are removed. Upon firing, setback sleeve
(2) compresses spring (6), releasing ball (5) which falls in a cavity in the fuzes's nose
portion, As setback forces dissipate, the spring (6) expands, pushing sleeve (2) forward
undetenting the spring-loaded slider (8,4) which moves the detonator (1) in line with the
firing pin (9). The movement is retarded by a friction disk (10), providing enough time for
the projectile to travel a safer distance from the weapon and crew.
Upon impact, the firing pin stabs the detonator, igniting the lead charge (11) and
booster (12) and resulting in detonation of the high explosive filler of the projectile.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
60-mm HE projectiles
60-mm mortars
2-273
(Reverse Blank)
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UNCLASSIFIED
Original
AST1150H 7
Flak, PD, Model
FOM No, 1390-37-1-3
Neg. 516917 (UNCLASSIFIED)
Figure 2400. Fuze, PD, Model M150, full view (U),
2-275
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UNCLASSIFIED
AST-11 60 H -001 -75 Original
Fuze, PD, Model M150
FOM No. 1390-37-1-3
(U) Description
The M150 (fig 2-100) is a setback, delayed-arming PD fuze having a multirnode
functioning capability. The M150 was developed by Rafael of Haifa, Israel, for increasing
the effectiveness of their 120-mm mortar projectiles. Multimode functioning is provided by
a dual-configuration design. In the above target mode, the fuze functions superquick,
whereas in the penetration target mode the fuze penetrates prior to functioning. In addition,
the fuze has a self-destruct and grazing capability.
(U) Unique Features
? Employs automatic safety wire.
? Employs delay arming of 0.5 to 2 seconds.
? Employs velocity amplifier rod for proximity functioning.
? Employs fuze plug for penetration prior to functioning.
? Employs detonator safety device.
(U) Characteristics
Fuze assembly:
Body material Steel
Weight w/o rod 1.330 kg (2.93 lb)
Weight w/rod 1.450 kg (3.20 lb)
Length w/rod 516 mm (20.3 in)
Length w/o rod 167.5 mm (6.59 in)
Booster:
Body material 7
Body length
Explosive 7
Explosive weight
Extension rod:
Length 425.5 mm (16.8 in)
Weight 0.180 kg (0.4 lb)
2-276
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UNCLASSIFIED
Original
(U) Characteristics (Continued)
Functional data:
Arming method Setback
Firing method Impact
Safety devices
Arming distance
Arming time 2 s
Self-destruct time 7
Delay time
(U) Design Details
Neg. 516915
AST-116011-001-75
Fuze, PD, Model M150
FOM No. 1390-37-1-3
(UNCLASSIFIED)
Figure 2-101. Fuze, 113, Model M150, contour view (U).
icifct , dual delay ning devicc, detonator safety device. self-destruct element.
2-277
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PD, Model M150
FOM No. 1390-37-1-3
(U) Design Details (Continued)
Design details are not known on the M150. Conversion from the target penetration
mode is accomplished by removal of the fuze plug and insertion of the velocity amplifier
rod (see fig 2-101). Bore safety is provided by a safety wire called an integrator element by
Israel. Muzzle safety is provided by a delay arming mechanism reportedly consisting of a
detent system on the detonator (most likely contained in a slider). The detent system
reportedly consists of the two tin brakes controlled via a piston-cylinder arrangement. The
first brake is released after a 0.5-second delay, and the second brake is released after a
2-second delay.
The dual-configuration design consists of a velocity amplifier rod, fuze plug, thick wall
nose fuze portion, fuze body housing, arming mechanism, detonator, self-destruct device,
detonator safety device, detonator lead, and booster assembly.
(U) Functioning
The functioning sequence is delineated in the following block diagram:
SETBACS mow
1
I FIRST ARMING DELAY
ISECINM MING DELAY
MIZE NORD
IMPACT:
IMPACT:
ABOVE TARGET
NODE;
VELOCITY UPLIFTER
ROD
IMPACT:
GRAZE ACTIMI
SELF- DESMUCT
PENETRATMN IIME;
DELAY FUNCTIOMNG
FIRING MECIIANISM
DETONATOR
BOOSTER
HE. DETONATION
(UNCLASSIFIED)
Figure 2-102. Fuze, PD, Model M150, block diagram,
functioning sequence (U).
2-278
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PD, Model M150
FOM No. 1390-37-1-3
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
120-mm HE projectiles
120-mm mortar
2-279
(Reverse Blank)
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CONFIDENTIAL
Original
Net -16415
AST-1160H4101-75
Fuze, PD, Model 7
FOM No. 1390-37-1-5
Figure 2-103, Fuze, PD, Model ?
(C) Description
The Israeli PD fuze jig 2-103 producedby
with 52-mm high-explosive mortar projectiles
function upon impact. Safety features include a
ammunition to be air-droppabie.
52-m
(UNCLASSIFIED)
rojectile (U).
ndust
setback-armed type designed to
ap and pin which allows the
Thfaze employs a spring-loaded, ?pivotab type rotor keeping detonator in the
position for bore safetv.
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CONFIDENTIAL
AST-1160H101-75 Original
Fuze, PD, Model?
FOM No. 1390-374.5
(C) Characteristics
Fuze assembly:
Body material Zinc alloy
Weight 416 g (0.92 lb)
Markings LOT IMI 14/68
Body length 1.99 in (50.5 mm)
Max diam 2.08 in (52.8 mm)
Thread diam 1.76 in (44.7 mm)
TI'! 20 (LH)
Booster:
Body material Zinc alloy
Length 0.38 in (9.7 mm)
Thread diam 1.30 in (33.0 mm)
TI31 24
Explosive weight 6.7 g (0.015 lb)
Explosive type
Detonator:
Type STAB
Length 0.18 in (4.6 ram)
Diam 0.30 in (7.6 inn])
Weight 0.96 g (14.8 gr)
Functional data:
Arming method Setback
Firing method Impact
Safety devices Safety cap and pin, out-of-line detonator
Arming distance
Arming time 7
2-282
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Original AST-1160H-001-75
(C) Design Details (fig 2-104)
RETAINER PIN
RETAINER PIN SPRING
DRIVE RIVET ?4
Lgpi5 ncp,TE ---"?291
SAFETY PIN
ASSEMBLY
Fuze, PD, Model ?
FOM No. 1390-37-1-5
SAFETY CAP
CAP
FIRING PIN
RETAINER BALL
-s--- FIRING PIN
FIRING PIN SPRING..
FUZE BODY.
.),...---METAL WASHER
? ? '
-6---PAPER WASHER
DETONATOR-.-,
.,?-4---R9TOR SPRING
1 ROTOR-fl
Neg. 516417
-4 -METAL DISC
?
RELAY
?
RELAY HOUSING
et---BOOSTER PELLET
-4---BOOSTER CUP.
(UNCLASSIFIED)
Figure 2-104. Fuze, PD, Model ?, exploded view (U).
2-283
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CONFIDENTIAL
AST416014-00115 Original
Fuze, PD, Model ?
FOM No. 1390-37-1-5
(C) Design Details (Continued)
The firing-pin spring and firing pin are positioned in the center hole of the fuze body,
with the cutout portion of the firing pin in position to receive the firing-pin retainer ball.
The ball is then dropped into an adjoining hole, permitting the ball to roll into the firing-pin
cutout. With the ball in position, the retainer-pin spring and retainer pin are placed into the
fuze body. The lock plate is then turned on the drive rivet, securing the retainer pin within
the fuze body. The cap is then crimped to the fuze body to prevent contaminants from
entering. Prior to crimping, the shoulder of the fuze body is waterproofed with a red
sealant. The safety cap is next screwed onto the fuze body and the safety pin inserted to
prevent premature movement of the firing pin.
The detonator with paper and steel washers is placed in the rotor. The rotor spring is
then positioned outside the rotor so that upon insertion into base opening of the fuze body,
the rotor is under spring-tension against the firing pin. A metal disk and delay housing with
relay are next positioned into the fuze body. The booster cup with booster pellet is then
screwed into the fuze body, completing the assembly of the fuze.
(C) Functioning (fig 2-105)
2 62
4
0 47
0 35
0 65
0 05
ALL DIMENSIONS IN INCHES
Neg. 516419
200 0IAM
2 08 DIAM
1 76 DIAM
20 TPI, LH
1 05 DIAM
1 23 DIAM
I irets,.=
tg;
4Plithirair
rate
PI VOTABLE ROTOR
(UNCLASSIFIED)
Figure 2-105. Fuze, PD, Model ?, contour and section views (U).
2-284
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CONFIDENTIAL
Original AST-1180H-001-75
Fuze, PD, Model?
FOM No. 1390-37-1-5
(C) Functioning (Continued)
Prior to firing, the safety pin (7) and safety cap (1) are removed. Upon firing, setback
forces compress the firing-pin spring (10) and the retainer spring (9), forcing the firing pin
(3) and the retainer pin (8) rearward and releasing the retainer ball (6) which falls into a
void of another channel.
As setback forces dissipate, the ruing-pin spring and retainer spring expand, moving the
firing pin (3) and retainer pin (8) forward. The retainer pin now blocks the opening where
the retainer ball went, undetenting the firing pin which had moved forward simultaneously
and releasing the spring-loaded rotor (14) which now pivots on its pin (12), aligning the
detonator with the firing pin (3). The fuze is now armed.
Upon impact with the target, the cap (2) is crushed, causing the firing pin (3) to stab
the detonator (13), which initiates the relay (15), which in turn initiates the booster pellet
(18) and results in detonation of the high explosive charge in the projectile.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
52-mm HE projectiles; 52-mm smoke
(WP) projectiles
52-mm mortar
2-285
(Reverse Blank)
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UNCLASSIFIED
Original AST-1160H-001-75
Neg. 517013
(UNCLASSIFIED)
Fine, PDSD, Type?
FOM No. 1390-37-1-9
Figure 2-106. Fuze, PDSD, Type ?, full view (U).
(U) Description
This is a conventional PD fuze (fig 2-106) with a mechanical self-destruct feature
activated by projectile spin decay. The out-of-line detonator is mounted in a ball rotor. The
fuze is used with the 30x113-mm B HE-1 cartridge, Type 6532, which is designed for
air-to-air use in DEFA, Type 552, aircraft guns. The fuze is a copy of the Oerlikon PDSD
fuze, Type laD-0250, which was developed prior to 1962. The fuze body bears stenciled
markings of the type shown. The upper line indicates manufacture in Israel, while the lower
line shows lot and year data.
2-287
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, PDSD, Type?
FOM No. 1390-37-1-9
(U) Characteristics
Fun assembly:
Body material Aluminum
Weight . 32.4 g (0.071 lb)
Markings See fig 2-106
Booster:
Body material (Cup) aluminum
Body length 7.6-mm (0.30 in)
Explosive 9
Explosive weight 1.4 g (21.6 gr)
Functional data:
Arming method Spin
Firing method Impact
Safety devices Out-of-line detonator in ball rotor
Arming distance 3 m (est)
Arming time 7
Self-destruct time 5-13s (est)
Delay time
The fuze consists of an aluminum body that contains a self-destruct mechanism, a
firing pin, a ball rotor carrying an out-of-line detonator, and a booster. In storage and
shipment, the fuze is kept safe by the out-of-line position of the detonator in the rotor.
Rotor position is maintained by pressure from the self-destruct spring and shock element,
acting through the firing-pin bushing.
(1..1) Functioning
Upon firing, the shock element is crushed by setback. When setback ceases, centrifugal
force causes the arming balls to move outward and forward against the conical surface of the
self-destruct housing. This action moves; the firing-pin bushing forward, further compressing
and restraining the self-destruct spring and releasing pressure on the rotor. Centrifugal force
causes the unbalanced rotor, now free, to rotate until the detonator is aligned with the firing
pin. Upon impact, the firing pin is driven into the detonator, which initiates detonation of
the booster. If impact does not occur, projectile spin will decay and centrifugal force
decrease until the compressed self-destruct spring overcomes the spin force on the arming
balls and drives the firing pin into the detonator.
2-288
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UNCLASSIFIED
Original AST-118011-001-75
Fuze, PDSD, Type ?
FOM No. 1390-37-1-9
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
30x113-mm B HEI projectile,
Type 6532
30-mm aircraft gun, DEFA, Type 552
2-289
(Reverse Blank)
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CONFIDENTIAL
Original AST-1160H-001-75
SELECTOR MOO
4 43
3430
433
imf
Foie, PD, Model V18111?
FOM No. 1390-37-2-2
taAN1
t.24 1/14131
-S DIAM
13 TIN
Ja MANI
34, 331ENWNS N (NO 43
2 (CONFIDENTIAL)
Figure 2-107, Fuze, PD, Model V1 811t,, full and contour views (1.1).
(C) Description
The V181.R. PD fuze (fig 2-107) is a setback-armed type designed for either
instantaneous or delay action functioning upon impact At was produced by lsraeli Military.
Industries for useS with Israeli shoulder-fired 82-mm high explosive rockers, it is? similar in
design to the French V48-1 except that the French lure does not contain a
May-functioning feature. This fuze is not considered hem safe.
2-291
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CONFIDENTIAL
AST-116014-001-75 Original
Fuze, PD, Model VI8I.R.
FOM No. 1390-37-2-2
(C) Characteristics
Fuze assembly:
Body material Brass
Weight 220 g (0.49 lb)
Markings V181.R.
Thread diam 23 mm (0.91 in)
TPI 13
Length overall 117 mm (4.61 in)
Max diam 3.15 mm (0.12 in)
Detonator cup:
Material Copper
Length 23 mm (0.91 in)
Diam 10,8 mm (0.43 in)
Weight 2.2 g (34.0 gr)
Booster cup:
Material Copper
Length 14 mm (0.55 in)
Diam 10.8 mm (0.43 in)
Functional data:
Arming method Setback
Firing method Impact
Safety devices Detent balls (3)
Arming distance
Arming time
Belay time
' Varics. depending upon anglc of fall.
2-292
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CONFIDENTIAL
Original
(C) Design Details
AST-116014-001-75
Fuze, PD, Model V18I.R.
FOM No. 1390-37-2-2
art; PROTECTIVE EAP
9RINGPIN RETAINER'
-4- FIRING PIN
-4- FIRING CREEP SPRING
17-- PRIMER HOLDER STOP
PRIMER HOLDER 0 ETENT BALL-1,1:1F PRIME R SAFETY BALL (2)
?-?
PRIMER HOLDER.-.4
PRIMER
FELT DISC 44444' '
? .4111.4 PRIMER HOLDER RETAINING RING
PRIMER HOLDER GUIDE' ? - '??
SETBACK SLEEVE'
SLEEVE
TRACK SPRING
SETBACK SPRING RETAINER
'RAZE BOGY;
DELAY ELEMENT RETAINING SCREW'
DETONATOR CUP
BOOSTER CUP
BOOSTER-DETONATOR HOUSING
DELAY ELEMENT''':
FOIL DISC,
CLOTH DISC
FELT DISC
Neg. 552097 (CONFIDENTIAL)
Figure 2-108. Fuze, PD, Model V18I.R., exploded view (U).
2-293
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CONFIDENTIAL
AST?1160H-001-75 Original
Fuze, PD, Model V181.R.
FOM No. 1390-37-2-2
(C) Design Details (Continued)
The fuze consists of a one-piece brass fuze body and a detonator-booster housing. The
brass fuze body, which is sealed at the nose by a protective cap and at the rearward end by
the detonator-booster housing, includes the components illustrated in figure 2-108.
(C) Functioning (fig 2-109)
Neg. 552098 (CONFIDENTIAL)
Figure 2-109. Fuze, PD, Model V181.R.,
section view (U).
2-294
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CONFIDENTIAL
Original AST-1160H-001-75
Fuze, PD, Model V181.R.
FOM No. 1390-37.2-2
(C) Functioning (Continued)
Prior to firing, the fuze selector rod (13) is set with the indicator arrow to I or R,
depending on whether instantaneous or delay action is desired.
Upon firing, setback forces moves the setback sleeve (6) rearward, compressing its
spring (7) until it is locked in the tapered retainer (20). The primer holder decent ball (8) is
released. During deceleration, the setback sleeve remains locked to the tapered retainer. As
the angle of fall of the projectde increases, the primer-holder (10) moves forward while the
detent ball (8) falls into the void area of the primer-holder guide (5). Travel of the primer
holder (10) is stopped by the primer-holder stop (4).
Simultaneously the two primer safety balls (19) are pushed into a recess in the front
end of the primer holder guide (5) by the tip of the firing pin (2). The fuze is now armed.
Upon impact, the two primer safety balls (19) lock the primer holder (10) in the
forward position so that the firing pin (2), moving rearward against its spring (3), can
produce a full blow on the primer (9).
If set on instantaneous, the primer flash initiates the detonator (15) and booster (16)
located in the detonator-booster housing (14). At low angles of fall, the primer holder (10)
is carried forward upon impact by inertia forces and impales on the firing pin, thereby
initiating the primer (9) and in turn the detonator and booster.
If a delay action is used, the direct passage from the primer to the detonator is closed
and upon impact the primer flash would initiate the delay element (22) which, upon
completion of burning, would ignite the detonator, setting off the booster.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
82-mm HE rocket
82-mm rocket launcher
2-295
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AST-1160H-001-75 Original
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? UNCLASSIFIED
Original AST:1160H-001-75
Fuze, PD, Model M.K.E. 101
FOM No. 1390-39-1-1
(UNCLASSIFIED)
Figure 2-110. Fuze, PD, M.K.E. 101,
full view (U).
(U) Description
The Turkish M.K.E. 101 PD fuze (fig 2-110) is a setback-armed type dcsigncd for SQ
or delay functioning upon impact. It is similar in functioning to the French V-18-112 fuze
(FOM No. 1390-17-1-2). The fuze is not considered detonator safe by US standards. The
fuze is assembled in an adapter having a 2-inch thread size to meet NATO standards.
2-297
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UNCLASSIFIED
AST-1160H101-75 Original
Fuze, PD, Model M.K.E. 101
FOM No. 1390.39-1-1
(U) Characteristics
Fuze assembly:
Body material Brass
Weight w/o explosive 1.60 lb (725.7 g)
Markings M.K.E. 101
Length 5.05 in (128.3 mm)
Max diam 31.5 mm (1.24 in)
Maj thread diam 23.4 mm (0.92 in)
TPI 16
Thread pitch 1.5 mm (0.06 in)
Booster:
Body material Brass
Body length
Explosive
Explosive weight
Functional data:
Arming method Setback*
Firing method Impact
Safety devices **
Arming distance 17 in
Arming time 0.7 $ (est)
Delay time 0.08 s
"Arming based upon calculated setback of 60 g's.
**Safety wire and detent balls.
2-298
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UNCLASSIFIED
Original AST-116014-001-75
(U) Design Details (fig 2-111)
STEEL FUZE
ADAPTER
Fuze, PD, Model M.K.E. 101
FOM No. 1390-39-1-1
DETONATOR? DETONATOR?
BOOSTER BOOSTER
HOUSING CUP
(UNCLASSIFIED)
Figure 2-111. Fuze, PD, Model M.K.E. 101, exploded view (U).
The M.K.E. 101 fuze consists of a brass PD fuze, a steel fuze adapter, and a
detonator-booster assembly.
The PD fuze is a bored-out brass body designed to house the plunger-type firing-pin
assembly, an inertial assembly, a primer housing, the detent system, a selector screw with
flash channels for either delay or SQ action, and a delay-charge assembly. The fuze body is
sealed at the forward end by a striker head retaining nut and is threaded internally at the
rear to facilitate assembly of the detonator-booster.
2-299
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UNCLASSIFIED
AST-1160H-001-75
Fuze, PD, Model M.K.E. 101
FOM No. 1390-39-1-1
(U) Design Details (Continued)
Original
The fuze is also threaded externally for screwing into a steel fuze adapter to facilitate
assembly to projectiles having 2-inch thread diameters.
(U) Functioning (fig 2-112)
ALL DIMENSIONS IN INCHES
1.24 DIAA1
.112 OIAM
111 TPI
13
(UNCLASSIFIED)
Figure 2-112. Fuze, PD, Model M.K.E. 101, contour and section views (U).
Prior to firing, the type of action desired must be selected before assembling into the
projectile. The arrow stamped at the bottom of the slot in the selector (13) is set at "H" for
SQ action, "T" for delayed action. The safety wire must also be removed before firing.
2-300
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PD, Model M.K.E. 101
FOM No. 1390-39-1-1
(U) Functioning (Continued)
Upon firing, setback forces cause the safety collar or setback sleeve (6) to move
rearward against the setback spring (10). The setback sleeve becomes wedged on the tapered
surface at the rear end of the inertial-element assembly (9). The primer locking ball (4) is
thus released so that it can move outward and free the primer-holder assembly (7). In flight,
the primer-holder assembly can then move forward under the influence of creep forces until
its forward end contacts the firing-pin spring guide (3). Movement of the inertial element is
restrained by firing-pin spring (2).
At impact, the firing pin and striker assembly (1) is pushed rearward against its spring,
while the inertial-element assembly moves forward. The unrestrained primer-holder
assembly moves forward relatively more rapidly than the inertial element and its associated
components. As the firing pin enters the primer body cavity, the two primer detent balls (5)
are pushed outward to protrude into the cavity between the forward lip of the inertial
element, the firing-pin spring guide, and the firing pin. This locks the primer assembly to the
forward moving inertial element. The momentum of the entire inertial assembly, rather than
just that of the primer assembly, impales the primer (8) on the firing-pin point to initiate
the primer.
When the selector is set for delay action, the primer flash ignites the charge in the
delay-holder assembly (11). This, in turn, sets off the detonator booster (12).
On an SQ setting, the primer flash passes through the open flash hole to initiate the
detonator-booster directly. If for some reason the detonator-booster is not set off in this
manner, it may still be initiated through the delay element which is also ignited by the same
primer flash.
(U) Applications (Ammunition and Weapons
Ammunition
Weapons
81-mm HE projectiles
81-mm mortar
2-301
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UNCLASSIFIED
Original AST-1160H-001-75
Section III.
POINT INITIATING, BASE
DETONATING FUZES
3-1
(Reverse Blank)
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UNCLASSIFIED
Original AST-1160H-001-75
Section III.
POINT INITIATING, BASE DETONATING FUZES
GENERAL
(U) Point initiating, base detonating (PIBD) fuzes have been designed or are under
development for high-explosive antitank (HEAT) munitions fired from tank guns, grenade
launchers, recoilless antitank weapons, aircraft rocket launchers, small arms (20 through
30 mm), and for antitank guided missiles (ATGMs). This type of fuze functions on
mechanical or piezoelectric principles by contact with the target, and with initiation at the
nose end and detonation at the base of the projectile or warhead. This type of fuze normally
requires a very complex design, especially in an ATGM which normally incorporates
redundancy in design.
(U) Most of the fuze developments included in this handbook have been designed for
quicker reaction time through the use of the piezoelectric principles; however, some of the
older spitback-type fuzes have been included. Most fuzes require setback or centrifugal force
environmental stimulus for arming. Delay arming is accomplished by a pyrotechnic and/or
mechanical timer. In some cases, electrical impulses generated at launch for rockets or
ATGMs are used to initiate the arming process with dual electric igniters for greater
reliability. With the exception of the spitback fuze types, the fuze designs presented in this
handbook reflect the current state-of-the-art and in some cases include unique features. The
fuzes described in this section are designed .for either high- or low-"g" accelerations and for
fin- or spin-stabilized projectiles or warheads.
3-3
(Reverse Blank)
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UNCLASSIFIED
FOM No.
INDEX
Nomenclature*
Page
1390-16-1-44
Fuze, PIBD, 30 mm, Model ? (Rheinmetall)
3-7
1390-16-8-1
Fuze, PIBD, for Cobra ATGM
3-9
1390-17-2-5
Fuze, PIBD, Model F-1
3-11
1390-17-8-2
Fuze, PIBD, for HOT ATGM
3-19
1390-17-8-3
Fuze, PIBD, for Milan ATGM
3-21
1390-18-2-2
Fuze, PIBD, Model 7
3-23
1390-19-8-1
Fuze, PIBD, for Bantam ATGM
3-31
1390-21-2-2
Fuze, PIBD, Model ?
3-33
1390-35-8-1
Fuze, PIBD, for Swingfire ATGM
3-37
1390-35-8-2
Fuze, PIBD, for Vigilant ATGM
3-45
*All fuze nomenclatures are UNCLASSIFIED.
3-5
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UNCLASSIFIED
LIST OF ILLUSTRATIONS
Figure Title* Page
3-1
Fuze, PIBD, Model F-1, PI element
3-11
3-2
Fuze, PIBD, Model F-1, section view of piezoid
3-13
3-3
Fuze, PIBD, Model F-1, BD element
3-14
3-4
Fuze, PIBD, Model F-1, diagram of functioning sequence
3-16
3-5
Fuze, PIBD, Model ?, contour views of PI and BD elements
3-23
3-6
Fuze, PI, Model 075, exploded view
3-25
3-7
Fun, BD, Model SV307, exploded view
3-26
3-8
Fuze, PI, Model 075, section view
3-27
3-9
Fuze, BD, Model SV307, section view of BD element
3-28
3-10
75-mm HEAT grenade with PIBD fuze
3-33
3-11
Fuze, PI, arming sequence
3-34
3-12
Fuze, PIBD, arming of safety device
3-35
3-13
Fuze, PIBD, for Swingfire, section view of warhead
3-37
3-14
Fuze, PIED, for Swingfire, PDU
3-38
3-15
Fuze, PIED, for Swingfire, SAU ?
3-39
3-16
Fuze, PIED, for Swingfire, SAU operation
3-41
3-17
Fuze, PIED, for Vigilant ATGM
3-45
All figure titles are UNCLASSIFIED.
3-6
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UNCLASSIFIED
Original AST-116014-001-75
Fun, PIED, 30 mm, Model ? (Rheinmetall)
FOM No. 1390-16-1-44
(U) Description
This is a P113D fuze for the 30x170-mm flat-cone shaped-charge projectile developed by
Rheinmetall, GmbH, Diesseldorf, Germany. The fuze incorporates a piezoelectric element
that transmits current to an electric detonator in the projectile base.
(U) Characteristics
Fuze assembly:
Body material
Weight
Markings
2
Booster:
Body material
Body length
Explosive 7
Explosive weight
Functional data:
Arming method Spin
Firing method Impact, setback
Safety devices Out-of-line detonator
Arming distance 7
Arming time
Self-destruct time
Delay time
(U) Design Details
The fuze is composed of a piezocrystal impact element in the projectile nose, placed at
an optimum standoff distance from the flat-cone shaped charge in the projectile body. The
current created by the piezocrystal upon impact with a target travels along an insulated
electrical conductor to a BD element in the projectile base. The base fuze contains an
out-of-line electric detonator in a ball rotor, and S&A mechanisms to insure safety in
handling and bore safety.
3-7
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UNCLASSIFIED
AST-1 160H-001-75 Original
Fuze, PIED, 30 mm, Model ? (Rheinmetall)
FOM No. 1390-16-1-44
(U) Design Details (Continued)
Details of this fuze and projectile are proprietary information of Rheinmetall, GmbH,
and the General Electric Company of Burlington, VT, the US licensee.
(U) Functioning
Arming is accomplished by a combination of setback and spin acting on the base
elements of the fuze. The fuze is armed when the rotor is aligned with the projectile axis
after it has cleared the gun muzzle. Upon impact, current generated from the piezocrystal
initiates the electric detonator, resulting in detonation of the projectile's shaped charge.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
30x170-mm HEAT projectile
30-mm AA gun
3-8
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CONFIDENTIAL
Original AST1160H410145
Fuze, PIBD, for Cobra ATGM
FOM No. 1390-16-8-1
(C) Description
The German Cobra ATGM has a PIBD fuze. The fuze impact bolt is supported by a
plate held in place by a plastic hood. When the fuze hits a hard target with sufficient
forward velocity, the impact bolt is driven rearward, piercing the support plate and
penetrating the fuze capsule. If the impact bolt is slowly pressed into the fuze housing, it
will not penetrate the support plate, but will push it rearward along with the fuze capsule
carrier and related mechanism. When the pressure on the impact bolt is released, a
compressed spring will move the fuze capsule carrier and impact bolt back into their initial
positions. If the slow-moving force on the impact bolt increases to the point where the fuze
body is actually deformed, the support plate will break in a designated place, and the fuze
capsule carrier will fall inside the warhead casing, making the warhead inoperative. The base
fuze mechanism or safety element, which contains an out-of-line detonator, is inserted into
the base of the warhead. For this mechanism to commence arming, it must receive at least
8 g's acceleration for a period of approximately 0.5 second. Normal arming is accomplished
approximately 3 seconds from missile launch.
3-9
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AST-1160H-001-75
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3-10
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Original
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CONFIDENTIAL
Original
RTV
TRANSFORMER
SUPPORT
AST.1160H.001-75
Fuze, PIED, Model F-1
FOM No. 139047-2-5
OGIVE
(PPO)
WIRE WAYS
(C) Description
NOSE
CONE
(PPO)
1.125-1.
INCHES
PIEZOIO
TRANSFORMER
(UNCLASSIFIED)
Figure 3-1. Fuze, PIED, Model F-1, PI element (U).
The F-1 PIED fuzc uses a piezogcnerator (fig 3-1) as the PI element for generating
voltage to initiate a bridge wire-type detonator housed in the base fuze. The base fuze
departs from conventional practices by the utilization of rocket motor pressure as an
environmental stimulus coupled with acceleration of the rocket. The omission of a timing
mechanism and the sequential operation of the base fuze components assure adequate time
prior to the arming of the fuze.
3-11
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CONFIDENTIAL
AST-1160H-001-75
Fuze, PIBD, Model F-1
FOM No. 1390-17-2-5
(C) Unique Features
? Piezoid with impedance matching transformer.
? Slider with bridge-wire detonator shorted out.
? Pressure piston, shear wire, and bore rider safety pin detenting slider.
(C) Characteristics
Point initiating element:
Piezoid:
Type
Material
Diameter
Length
Capacitance
Dielectric constant:
K3
D33
Transformer:
Type
Primary winding
Secondary winding
Voltage reduction
Impedance reduction
Primary resistance
Secondary resistance
Primary inductance
Secondary inductance
Base fuze:
Weight
Volume
3-12
High impedance
Lead zirconate-titanate
0.708 in (18 mm)
0.327 in (8.4 mm)
?750-950 pF
1900
2.7x10-9 coulomb/lbf
Impedance matching
100 turns
25 turns
4 to 1
10 to 1
2.5 ohms
0.2 ohms
20 mH
1.2 mH
50 g (0.11 lb)
1.78 in' (29.2 cm3'
CONFIDENTIAL
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CONFIDENTIAL
Original
(C) Characteristics (Continued)
Detonator:
Model
Type
Resistance
Explosive
Components
AST-1160H-001-15
Fuze, PIBD, Model F-1
FOM No. 1390-17-2-5
ADFP
Bridge wire, low impedance
19.5 ?3.5 ohms
Lead azide 100 mg (15.4 g)
PETN 165 mg (25.5 g)
Functional data:
Arming method Gas pressure and acceleration forces
Firing method Rocket motor gases
Safety devices Piston shear wire and bore rider
Arming distance
Arming time
Self-destruct time
Delay time
(C) Design Details
safety pin
4.6 m
INSULATOR
108 BIAS!
All
PIEZ010
1.5110 IMAM X mem I
ALL DIMENSIONS IN INCHES
(CONFIDENTIAL)
Figure 3-2. Fuze, PUN), Model F-1, section view of piezoid (U).
3-13
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CONFIDENTIAL
AST-1160H-001-75 Original
Fuze, PIED, Model F-1
FOM No. 1390-17-2-5
(C) Design Details (Continued)
The piezogenerator (fig 3-1) consists of a piezoid package and an impedance matching
transformer. The piezoid (fig 3-2) is mounted in the nose cone. The transformer support is
glued to the nose cone, and the piezoid and transformer leads are soldered together. The
ogive of the warhead is glued to the nose cone. The cavity around the transformer is filled
with room temperature vulcanizing rubber (RTV), and the resistance wires are glued in the
wireways of the warhead. The assembled nose cone is made of polyphenylene oxide (PPO)
plastic. The impedance matching transformer consists of two iron cores with a primary
winding of 100 turns and a secondary winding of 25 turns. The piezoid package is located
1.125 in (28.6 mm) behind the nose of the warhead (see fig 3-1).
SLIDER LOCK al
IARMEDI
SECTOR
PIVOT PIN
BASE SEA
?SLIDER
LOCK PIN
SECTION C-C
SECTION A-A
SECTOR
SHEAR
WIRE
MOTOR
PRESSURK
PISTON Q.)
FUZE BODY
SLIDER
LOCK SPRING
CONTACT
SPRING
ELECTRICAL
CONTACT (21
BORE
RIDER PIN
LOCK
RING
CLOSURE
DISC
SLIDER a)
SECTOR
SPRING
ADFP12
DETONATOR?
OUTER CASE
SLIDER
SPRING 0
SECTOR
&At",
wromv. p
II BORE
SAFETY
PIN
SECTION D-D
C) BORE SAFETY SPRING
Figure 3-3. Fuze, PIP.D, Model F-1, BD element (II).
3-14
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SECTION B-8
(CONFIDENTIAL)
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Original AST-1160H-001-75
Fuze, PIED, Model F-1
FOM No. 1390-17-2-5
(C) Design Details (Continued)
The Base fuze (fig 3-3) is a compact design weighing 50 grams and occupying 1.78 in'
(29.2 cm') of volume requiring approximately 0.920 in (23.4 mm) of warhead section
length. The base fuze components arc as follows:
(1) The outer case is machined from aluminum bar stock and anodized. The
extension to house the slider spring is bonded to the body after anodizing. This extension
also holds the fuze fixed with respect to the motor when the warhead is being assembled.
(2) The pressure piston is machined from aluminum and anodized. It is mated to the
case prior to drilling the shear wire hole. The seal between the pressure piston and the case is
madc by an 0-ring of synthetic material.
(3) The sector has a complex shape requiring at least two different setups to produce.
It is made from aluminum. The weight is consistent from fuze to fuze.
(4) The body and slider are machined from MAKROLON, a polycarbonate plastic
(LEXAN is also a polycarbonate). LEXAN, and probably MAKROLON, can be
injection-molded; therefore, the reason for the extensive machining is unclear. The
dimensional tolerances do not appear prohibitive.
(5) The slider lock pin, bore safety pin, and slider lock are made from nickel-plated
steel.
(6) The bore rider pin is made from red anodized aluminum. The bore rider extension
(not shown) is molded from plastic.
(7) The closure disk is a composite of steel and MAKROLON.
(8) The detonator contacts engage both side and bottom of detonator pins. The
contacts are made from tempered beryllium copper hot-dipped in solder.
(9) The base seal is made of synthetic elastomer providing a secondary seal of the
warhead and fuze from rocket motor gases. The prime seal is an 0-ring mounted in the
forward motor bulkhead. It also provides a cushioning effect for the fuze after the warhead
is mounted.
3-15
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CONFIDENTIAL
AST-II60H-001-75 Original
Fun, PIBD, Model F-1
FOM No. 1390-17-2-5
(C) Functioning (fig 3-3)
Upon firing, the propellant gas impinges on the piston (1); simultaneously the round
accelerates and the bore safety pin (2) sets back, blocking the sector (3); then the propellant
pressure becomes sufficient to shear the pressure piston shear wire, releasing the sector (3).
At the tube exit, the bore rider extension is ejected by the spinning motion and a light
spring. After burnout, the bore safety pin is moved forward by its spring (4), then the
sector (3) is allowed to complete its travel. The slider (5) begins to move in line, forcing the
slider lock pin (6) into a slot in the sector (3). At the completion of travel (14 mm or
0.550 in), the slider (5) is locked by the slider lock (7). The detonator (8) is now connected
to the piezogenerator through the slide contacts. The functioning sequence of the fuze is
shown in block diagram, figure 3-4.
BLOCK DIAGRAM OF RUE SEQUENCE IU/
LAUNCH
BORE RIDER SAFETY
PREVENTS SLIDER MOVEMENT
FACTOR PRESSURE I
IACCELERATION
BORE SECURITY PIN
BLOCKS SECTOR MOVEMENT
PRESSURE PISTON
RELEASES SECTOR
IROUNO LEAVES UUMCNERIROCKET BURROW'
ICENTRIFUGAL FORCE AND SPRING
THROW OUT BORE RIDER
BORE SECURITY PIN
RELEASES SECTOR
SECTOR BRINGS 10 MOE
FREEING SLIDER LOCK PIN
DER FORCES LOCK PIN
INTO RECESS
I suoin moils INLINE
ITARGET IMPACT CRUSINES PIEZOELECTRIC CRISTAL
I ROUND IINTIATED I
(CONFIDENTIAL)
Figure 3-4. Fuze, PIBD, Model F-1, diagram of
functioning sequence (U).
3-16
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PIBD, Model F-1
FOM No. 1390-17-2-5
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
89-mm HEAT rocket LRAC, Model F-1
89-mm rocket launcher, Model F-1
3-17
(Reverse Blank)
UNCLASSIFIED
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CONFIDENTIAL
Original AST-1180H-001-75
Fuze, PIBD, for HOT ATGM
FOM No. 1390-17-8-2
(C-NFD) Description
The HOT* ATOM has a PIBD fuze. The electrical fuze is initiated by crushing the
outer shell of the warhead until it makes contact with the inner liner. The fuze will initiate
at angles of incidence up to 80?.
The S&A operation is accomplished by a series of devices designed to prevent
premature detonation. The activation of these devices is dependent upon:
? The missile leaving the launch tube (a locking device held in position by
the walls of the launch tube releases when the missile leaves the tube and
allows a spring to drive the arming device into position).
? Launch acceleration (launch acceleration locks a device into position
which permits alignment of the explosive train).
? Guidance wire (when the guidance wire has unwound approximately 30 to
50 meters, it pulls a shorting pin).
? Thermal battery (initiation of the onboard thermal battery is necessary to
close an arming switch).
? Time delay (a simple time delay is also incorporated into the arming
sequence).
*HOT (Haut Subsomque Optiquement teleguide NIT' dun tube).
NO FOREIGN DISSEM
3-19
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CONFIDENTIAL
AST-1600H-001-15 Original
(This page intentionally left blank)
NO FOREIGN DISSEM
3-20
CONFIDENTIAL
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, P1BD, for Milan ATGM
FOM No. 1390-17-8-3
(U) Description
The French Milan ATGM has a PIBD fuze. The pyrotechnic fuze used to detonate the
main charge also functions as the front bulkhead of the motor. A primer pellet gate piston
assures safety of the fuze while the missile is in the tube. When the missile leaves the launch
tube, a spring-loaded pin moves and unlocks the piston. Gas pressure from the propulsion
motor then displaces the piston and thereby arms the fuze.
The electrical circuit which ignites the detonator squib in the fuze is shorted until the
missile is a safe distance from the gunner. A shorting contact, in parallel with the squib
bridge wire, is broken after 20 meters of guidance (factory adjustable) wire has been
unreeled.
Detonation occurs as the warhead ogive is deformed at impact, making electrical
contact between the inner and the outer shells. The fuze weighs 300 grams and will initiate
at impact angles of up to 800
.
3-21
(Reverse Blank)
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UNCLASSIFIED
Original
POINT INITIATING FUZE
MODEL 075
(U) Description
67 OIAM
.59 DIAM
24 TN
3.07
ALL DIMENSIONS IN INCHES
2.89
AST-1160 H-001-75
Fuze, PIED, Model?
FOM No. 1390-18-2-2
.93 OIAM
102 DIAM
17 TPI
BASE DETONATING ELEMENT
MODEL 5V307
Figure 3-5. Fuze, PIED, Model ?, contour views of
PI and BD elements (U).
(UNCLASSIFIED)
The Swiss PIBD fu-zing system (fig 3-5) designed by Oerlikon for 80-mm aircraft HEAT
rockets consists of a PI fuze, Model 075, and a BD element, Model SV307. It is a setback,
delay-arming type that functions upon impact with the target.
(U) Unique Features
It employs an escapement via a pinion-gear-rack arrangement with a spring-loaded
slider providing a mechanical block of the spitback flash from the PI fuze. The delayed
arming is controlled via the escapement.
3-23
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UNCLASSIFIED
AST-11 60H-001-75 Original
Fuze, PIBD, Mode!?
FOM No. 1390-18-2-2
( U) Characteristics
PI fuze:
Body material Tin-coated brass
Weight 0.05 lb (22.1 g)
Overall length 1.67 in (42.42 mm)
Major body diam 0.67 in (17 mm)
Thread diam 0.59 in (15 mm)
TPI 24
Pitch 1 mm (0.04 in)
BD clement:
Body material Aluminum
Weight 0.33 lb (149.8 g)
Overall length 3.07 in (77.98 mrn)
Major body diam 0.93 in (23.62 mm)
Thread diam 1.02 in (25.9 mm)
TN 16
Pitch 1.5 mm (0.06 in)
Functional Data:
Arming method Setback
Firing method Impact
Safety devices **
Arming distance
Arming time 7
PI fuze has a setback sleeve, setback spring, and shear ring that acts as a safety against initiation of flashback primer.
**Base clement has spring-loaded slider providing a mechanical block of the flash path to the detonator. The slider's
movement is delayed by an escapement mechanism.
3-24
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original
(U) Design Details
AST-1160H-001-75
Fuze, PIBD, Model?
FOM No. 1390-18-2-2
1
3
4
7 8
(UNCLASSIFIED)
Figure 3-6. Fuze, PI, Model 075, exploded view (U).
PI fuze, Model 075. The PI fuze (fig 3-6) consists of a tin-coated brass fuze body (1), a
steel plunger-type firing pin (2), steel ring (3), polyethylene nose cap (4), brass spring and
shear safety support (5), steel setback spring (6), primer assembly (7), and aluminum primer
carrier with steel shear ring (8).
3-25
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AST:1600H-001-75
Fuze, PIBD, Model?
FOM No. 1390-18-2-2
(U) Design Details (Continued)
?o),
?1
UNCLASSIFIED
2
11
4
10
17 18 19
21
4
14
15
Original
16
(UNCLASSIFIED)
Figure 3-7. Fuze, BD, Model SV307, exploded view (U).
BD element, Model SV307. The BD element (fig 3-7) consists of the delay assembly
housing (1), retainer sleeve (2), fuze body (3), booster housing (4), gear assembly (5),
pinion-gear assembly (6), gear spindle (7), pallet (8), bearing plate (9), slider retaining
pin (10), safety pin (11), slider assembly (12), slider block (13), inner slider spring (14),
outer slider spring (15), setback spring (16), setback pin (17), rack (18), booster disk (19),
booster cushion (20), and booster washer (21).
3-26
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UNCLASSIFIED
Original AST-118011.0131-75
(U) Functioning
2
3
4
Fuze, EIBD, Model?
FOM No. 1390-18-2-2
(UNCLASSIFIED)
Figure 3-8, Fuze, PI, Model 075, section view (U).
3-27
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UNCLASSIFIED
AST-116011-001-75 Original
Fun, PIBD, Model?
FOM No. 1390-18-2-2
(U) Functioning (Continued)
Point initiating fuze, Model 075 (fig 3-8). On acceleration, both the striker pin (1) and
primer-carrier assembly (5) move rearward. If impact occurs before the acceleration load on
the spring (3) falls below the approximate 4.5-lb (2 kg) load required to keep it fully
compressed, the primer carrier moves forward against the striker-pin flange. Impact forces of
approximately 700 lb (317.5 kg) shear the plate (i.e., top washer of the primer-carrier
assembly) and permit the striker point to enter and set off the primer (4). If impact occurs
after the acceleration load on the spring (3) falls below the approximate 4.5-lb load referred
to above, the spring will have returned the striker pin and primer-carrier assembly to their
normal position. In this case the striker pin will be forced rearward into the primer after
shearing the plate. It should be noted that the primer spitback charge bottom is concave
shaped to obtain better initiation.
ROTATED 900
12
$lleirs-S.,
Wen
%Iowa
???:-
SECTION C-C
(UNCLASSIFIED)
Figure 3-9. Fuze, BD, Model SV307, section view
of BD element (U).
3-28
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UNCLASSIFIED
Original AST-116014-001-75
Fuze, PIED, Model?
FOM No. 1390-18-2-2
(U) Functioning (Continued)
Base detonating element, Model SV307 (fig 3-9). When the carrier rocket is fired, the
setback pin (5) and the rack (4) start to move rearward. The setback pin's travel is hindered
only by the spring (6), which it compresses relatively quickly. On the other hand, the
rearward movement of the rack is delayed by the fuze clockwork mechanism (3) through
the pinion gear (2). When the rack top has moved below the transversely drilled hole in
which the safety pin (12) is assembled, the safety pin is dammed into the cavity above the
rack and setback pin. This transfer is accomplished with the aid of the continued
acceleration forces acting on the safety pin through the tapered surface of its seat in the
slider retaining pin (11). When the slider retaining pin moves below the bottom surface of
the slider assembly slot, the slider assembly (10) is freed and is then pushed along its slot by
the slider-spring assembly (9). This movement aligns the slider hole with the flash hole of
the base detonating element. A clear path is then open between the point impact fuze
primer carrier charges and the detonator assembly (8) at the bottom of the base element.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
80-mm HEAT rocket
80-mm rocket pods mounted on aircraft
3-29
(Reverse Blank)
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PIED, for Bantam ATGM
FOM No. 1390-19-8-1
(U) Description
The Swedish Bantam ATGM has a PIBD fuze. The fuze is armed when a microswitch,
mounted on one spool of control wire, is closed after 230 meters of wire have been
dispensed. The fuze is initiated when an electrical connection is made between two ogival,
thin metal shells that make up the nose of the missile. The two shells are ordinarily
separated by a small space until the missile strikes an object, deforming the outer shell so
that it contacts the inner shell.
The double-sheathing nose design ensures that fuzing at angles of impact up to 90? is
achieved.
3-31
(Reverse Blank)
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UNCLASSIFIED
Original
AST-116011-001-75
Fuze, PIRO, Model ?
FOM No. 1390-21-2-2
SA'kvdk-xicc
Re&
bider
Figure 3-1 75-mm HEAT grenade
UNCLASS
PIBD fuze (U).
UNCLASS F ED
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UNCLASSIFIED
AST-160014-001-75
Fuze, PIED, Model?
FOM No. 1390-21-2-2
(U) Description
Original
The Belgium PIBD fuze is a spitback type designed for use with the super-blindicide
75-mm HEAT rocket, Energa (fig 3-10). It consists of a setback-armed, PI fuze with a
graze-sensitivity feature and a BD element with a safety device providing a mechanical block
on the main detonator.
(U) Functioninp
i'?111111111i .0 siossi
rrkt
Rohr riL4 of anon)
-The bolls ari-ire
SIIIII?111110
00
Normal 130?101/1 & II01150qt
Bolling rnmerne.til 01 arufing .leeve
(UNCLASSIFIED)
Figure 3-11. Fuze, PI, arming sequence (U).
3-34
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, PIED, Model ?
FOM No. 1390-21-2-2
(U) Functioning (Continued)
The arming of the PI fuze (fig 3-11) is as follows: Upon setback, the setback sleeve (1)
moves rearward, compressing its spring and thereby releasing the detent balls (2). This
movement releases the striker (3) and detonator housing.
The PI fuze portion is now armed and ready to function.
Shroud o released
Th
Narrlidi pn,flinn 1,1orni._! I huhptprt
eionso oi ,ditth simmul
I HIMEJI or I, um oNert'd
(UNCLASSIFIED)
Figure 3-12. Fuze, PIED, arming of safety device (U).
3-35
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UNCLASSIFIED
AST-1600H-001-75 Original
Fuze, PIBD, Model 7
FOM No. 1390-21-2-2
(U) Functioning (Continued)
The arming of the safety device (fig 3-12) is as follows: When setback ceases, the safety
cap (2) under pressure from spring (1) as a result of setback is thrown forward toward the
front, freeing the passageway to the main detonator (3).
Upon impact, the striker stabs the detonator which spits back to the main detonator at
the base of the warhead. This, in turn, initiates the relay or booster charge, resulting in
detonation of the shaped charge.
3-36
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CONFIDENTIAL
Original
RF SCREEN
NOSE SWITCH
CONTACTS
(C) Description
LIP31
NOSE SWITCH
TERMINAL
MAIN
CHARGE
AST-1160H101-75
Fuze, P1BD,for Swingfire ATGM
FOM No. 1390-35-8-1
C E.
PELLET
PEW INSPECTION
CONNECTOR PIPE WINDOW
/ /
//////.11/////
///// /////////1
`R.L.
//
//
I
/fl/
a lPir
11111r..t.:".11.
-------
r
-
NOSE SWITCH
LEADS
WARHEAD, GM, KUM
SAU MECHANISM
15 WAY
CONNECTOR
Figure 3-13. Fuze, P1BD, for Swingfire, section
view of warhead (U).
(CONFIDENTIAL)
The Swingfire warhead GMK14A1 (fig 3-13) has a PIBD fuze developed in England by
Graviner, Ltd. It includes a nose switch, a safety and arming unit (SAU), and a pressure
delay unit (PDU).
(C) Characteristics
Fuze assembly:
Body material Aluminum
Weight of SAU 43 g (0.095 lb)
Markings of SAU GM, K31A1
Markings of PDU GW, KlAl
3-37
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CONFIDENTIAL
AST-1160H-001-75 Original
Fuze, PIBD, for Swingfire ATGM
FOM No. 1390-35-8-1
(C) Characteristics (Continued)
Booster:
Explosive CE
Explosive weight 18 g (0.040 lb)
Functional data:
Arming method Propellant actuated
Firing method Impact
Safety device PDU and mechanical detent
Arming time 3 s
Arming distance 80 m
PRESSURE TO SAFETY
AND ARMINGARMING UNIT
C. E. EXPLOSIVE
n.
DIAPHRAGM
SimSaitli
''11,111namille 4.
Pt /441
PYROTECHNIC DELAY
COLUMN
PRESSURE DELAY UNIT
Figure 3-14. Fuze, PIBD, for Swingfire, PDU (U).
3-38
CONFIDENTIAL
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PRESSURE FROM
nen
ROCKET MOTOR
(CONFIDENTIAL)
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
CONFIDENTIAL
Original
1. FLYING LEAD TO WARHEAD NOSE
SWITCH
2. 15-WAY FLYING LEAD SAU-
AFTBODY
3. 15-POLE PLUG
4. WINDOW
5. REVERSIBLE DIAPHRAGM HOUSING
6. FIRING CAPACITOR
7. BLEED RESISTORS
8. CHARGE RESISTORS
9. CHARGING SWITCH AND SHORTING
LINK
10. SHUTTER MECH HOUSING
11. CHARGING SWITCH OPERATING
ARM
12. EXPLOSIVE MOTOR
13. SCREENED IGNITER
AST-116011-001-75
Fuze, PIBEy for Swingfire ATGM
FOM No. 1390-35-84
(CONFIDENTIAL)
Figure 3-15. Fun, PIBD, for Swingfire, SAU (U).
3-39
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CONFIDENTIAL
AST-1160H00145 Original
Fuze, PISD, for Swingfire ATGM
FOM No. 1390-35-8-1
(C) Design Details
The PDU (fig 3-14) consists basically of a diaphragm, striker, pyrotechnic delay
column, and CE charge. It is operated by pressure from within the rocket motor.
The SAL) (fig 3-15) is a complete assembly screwed to the rear of the main charge
casing. The unit consists of a body casting containing a rotatable shutter which carries a
detonator, a screened igniter, a CE pellet, an explosive motor, actuator arm and spring, and
a pressure-operated lock post. The unit is connected electrically to the missile by a 15-way
connector plugged into the leads running under the strake. The unit has a two-way switch
lead and a circuit board mounted in the rear of the assembly. The circuit board comprises a
capacitor, resistors, and a rotary charging switch. The unit is connected to the PDU by a
pipe.
The nose switch consists of:
? The nose cone which is an ogival aluminum alloy RF screen.
? Inner and outer ogival copper liners which are insulated from each other
and from switch contacts. Electrical connections from the inner and outer
switch contacts are by means of a twisted pair of leads connected to a
flying lead from the SAU.
3-40
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CONFIDENTIAL
Original
A. LOCK POST DISENGAGED FROM
BASE PLATE, SHUTTER HELD
BY ACTUATING LEVER
R. EXPLOSIVE MOTOR FIRED
AND SHUTTER SPRING
FULLY LOADED.
a BEFORE POU IS
INITIATED, LOCK
POST IS ENGAGED
IN RECESS IN
BASE PLATE
AST-116014-001-75
Fuze, PIBD, for Swingfire ATGM
FOM No. 1390-35-8-1
1 LOCK POST
2. ACTUATING LEVER
3. BASE PLATE
4 IGNITER ELECTRIC UN HOLDER ABOVE SHUTTER I
5 SCREENED IGNITER HOLDER
IL SHUTTER
7 DETONATOR
8 SHUTTER SPRING
9 CHARGING SWITCH DRIVE PIN
10. REVERSIBLE DIAPHRAGM
11 EXPLOSIVE MOTOR
PRESSURE FROM POU
b AFTER POU IS INITIATED,
LOCK POST IS DISENGAGED
FROM BASE PLATE BY
REVERSIBLE DIAPHRAGM
C. SHUTTER SPRING OVERCOMES
LOCK POST PAWL SPRING
AND DRIVES SHUTTER TO
ARMED POSITION.
SAU OPERATION
(CONFIDENTIAL)
Figure 3-16. Fuze, PIBD, for Swingfire, SAU operation (U).
3-41
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CONFIDENTIAL
AST-1150H-001.15 Original
Fuze, PIBDsfor Swingfire ATGM
FOM No. 1390-35-8-1
(C) Functioning
PDU. When pressure in the propulsion motor has built up to 800 lb/in2, the
diaphragm in the PDU reverses and initiates the delay column. Gas pressure reaches the PDU
through the air space between the hypalon inhibitor and rocket motor casing. After a delay
of 2 seconds, the CE charge is initiated and the resultant gas pressure is piped to the SAU to
disengage the shutter lock post.
SAU (fig 3-16). The first restraint, the shutter lock post, holds the shutter in the
SAFE position. It is disengaged from the shutter by the reversal of a diaphragm actuated by
pressure from the pressure delay until approximately 2 seconds after launch, corresponding
to about 50 meters of missile flight.
The second restraint, applied by the actuator arm, is removed by the explosive motor. The
actuator arm is pivoted in the body casting and is the means by which additional torque is
applied to the actuating spring to rotate the shutter. The actuator arm is moved by a piston
in the explosive motor.
The explosive motor, mounted on the base of the body, is fired by the breaking of a
loop after the first 80 meters (?10 meters) of wire has been dispensed. On firing, the piston
of the explosive motor operates the actuator arm, which increases torque on the shutter
driving spring and drives the shutter to the armed position.
The shutter is pivoted in the body casting and is actuated by a torsion spring anchored
between the shutter and the actuator arm. In the SAFE condition, the shutter is positioned
between the igniter and the CE pellet and held by the lock post. The igniter is thus screened
from the CE pellet and the main charge. In the ARMED condition, the detonator in the
shutter is positioned between the igniter and the CE pellet to complete the explosive train
to the main charge.
Should the explosive motor fire before the lock post has been raised (due to more than
a 2-second delay in the PDU or a free-running wire), the SAU will still arm after both
restraints have been removed. Rotation of the shutter moves the plastic link to close the
charging switch on the breadboard. This allows current to flow from the thermal battery to
charge up the firing capacitor. Simultaneously the shutter movement breaks a shorting link
across the igniter by opening a switch.
3-42
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Original AST-116014-00145
Fuze, PIBDIfor Swingfire ATGM
FOM No. 1390-35-8-1
(C) Functioning (Continued)
Nose switch. On impact, the nose of the warhead is crushed, and the inner and outer
copper liners of the nose switch make contact and complete the igniter firing circuit; current
then flows from the firing capacitor to fire the igniter. This fires the detonator which in turn
fires the stemming and main charges. The copper cone in contact with the main charge
creates a shaped-charge effect forming a high-speed jet. Should the nose switch not function
for any reason, at the end of flight the bleed resistors will discharge the firing capacitor once
the flow of current from the thermal battery ceases. The warhead will then be safe.
3-43
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CONFIDENTIAL
AST-1600H-001-75 Original
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3-44
CONFIDENTIAL
(This page is UNCLASSIFIED)
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CONFIDENTIAL
Original
ASh 16DHOOV7
?Fuze, PlBDfor \Al
Figure 3-17. Fuze, PIBD, for Vigilant AT 11,1
(C) Description
(Li) The Vigilant
incidence up to 70?. Arming
power from the missile alternator.
(UNCLASSIFIED)
17) has a nose contact that will operatet angles of
complished by the simultaneous application of electric
(C) The fuze is designed to Isis Ordnance Board Safety requirements. The
now probe contact retracts for storage, It is? manually extended and automatically locked
out when setting up for firing. Two-stage arming is employed: the combination of an
inertial)operated, distance-measuring mechanism and a 'le-sensitive shutter detent that
prevents arming until the missile has sustaned at least a 3-g acceleration for 1.5 seconds and
has flown 110 meters (25 seconds), An escapement mechanism ?controls the speed of
rotation of the shutter.
345
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CONFIDENTIAL
AST-116084P0115 Original
Fuze, P111313,for Vigilant ATGM
FOM No. 1390-35-8-2
(C) Description (Continued)
(C) The turbo-alternator charges up a capacitor. When the nose probe crushes on
impact, the capacitor is discharged through a detonator. This explodes the warhead through
a boost pellet assembly. At normal impact angles a crush switch on the nose closes, causing
the warhead to detonate. If the impact occurs at angles greater than 45? so that the crush
switch is not closed, an inertial-operated switch initiates detonation.
3-46
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UNCLASSIFIED
Original
Section IV.
BASE DETONATING FUZES
4-1
(Reverse Blank)
UNCLASSIFIED
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AST-1160H-001-75
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UNCLASSIFIED
Original AST-1150H-001-75
Section IV.
BASE DETONATING FUZES
GENERAL
(U) Base detonating (BD) fuzes have been designed or are under development for
armor-piercing, high-explosive incendiary (APHEI) projectiles, high-explosive antitank
(HEAT) projectiles, and high-explosive plastic (HEP) projectiles. These fuzes usually
function on mechanical or electrical principles, by contact with the target and with
detonation at the base end of the projectile or warhead. This type of fuzing is less complex
than the PIED fuze, and offers a direct solution to fuzing problems associated with the
initiation of shaped-charge or HEP projectiles used in a direct fire role.
(U) The fuzes described in this section are designed for either high- or low-"g"
accelerations and for fin- or spin-stabilized projectiles or warheads.
(U) Some of the fuze developments included in this handbook incorporate a
graze-sensitive or self-destruct feature and have been designed to function either
instantaneously or with a delay upon impact with the target.
(D) Most BD fuzes require either a setback or centrifugal force environmental
stimulus for arming; some of the fuzes, especially for ATGMs, have delayed arming, usually
accomplished by a pyrotechnic delay or mechanical timer.
(U) With the exception of some older obsolescent types, the fuze designs presented in
this handbook reflect the current state-of-the-art and, in some cases, have unique features.
4-3
(Reverse Blank)
UNCLASSIFIED
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UNCLASSIFIED
Original
FOM No.
INDEX
Nomenclature*
AST-1160H-001-75
Page
1390-16-1-30
Fuze, BD, Model BDZ DM 711
4-7
139 0-1 6-1-3 1
Fuze, BD, Model BDZ DM 731
4-9
1390-17-2-4
Fuze, BD, Model (STRIM)
4-11
1390-18-1-45
Fuze, BDSD, Oerlikon, Type BZD-0236
4-17
1390-19-1-7
Fuze, BD, Model (MINIMAN)
4-21
1390-35-1-1
Fuze, BD, Model No. 303 Mk 1
4-29
1390-35-1-3
Fuze, BD, Model L29A2
4-35
1390-35-1-7
Fuze, BD, Model L24A2
4-37
1390-35-1-4
Fuze, BD, Model L19A4
4-39
1390-35-1-24
Fuze, BD, Model L10 Mk 1
4-41
1390-35-1-25
Fuze, BD, Model Ll 5A2
4-49
1390-35-1-26
Fuze, BD, Model L19A1
4-57
1390-35-1-27
Fuze, BD, Model L24A1
4-67
1390-35-1-28
Fuze, BD, Model L29A1
4-77
1390-35-2-1
Fuze, BD, Model L16A1
4-87
1390-35-2-2
Fuze, BD, Model L5, M404, Mk 1
4-95
1390-37-1-8
Fuze, BDSD, Type?
4-103
'All fuze nomenclatures are UNCLASSIFIED.
4-5
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UNCLASSIFIED
AST-1160H-00175 Original
LIST OF ILLUSTRATIONS
Figure Title* Page
4-1
Fuze, BD, Model (STRIM), full view
4-11
4-2
Fuze, BD, Model (STRIM), exploded view
4-13
4-3
Fuze, BDSD, Model BZD-0236, section view
4-17
4-4
Fuze, BD, Model (MINIMAN), full view
4-21
4-5
Fuze, BD, Model (MINIMAN), exploded view
4-23
4-6
Fuze, BD, Model (MINIMAN), disassembled S&A device
4-24
4-7
Fuze, BD, Model (MINIMAN), piezold assembly
4-25
4-8
Fuze, BD, Model (MI NIMAN), section view of S&A device
4-26
4-9
Fuze, BD, Model No. 303 Mk 1, contour and cutaway views
4-29
4-10
Fuze, BD, Model No. 303 Mk 1, section view
4-33
4-11
Fuze, BD, Model L29A2, contour view
4-35
4-12
Fuze, BD, Model L10 Mk 1, contour and section views-
4-41
4-13
Fuze, BD, Model L10 Mk 1, functioning views
4-46
4-14
Fuze, BD, Model Li 5A2, contour and section views
4-49
4-15
Fuze, BD, Model L15A2, functioning views
4-55
4-16
Fuze, BD, Model L19A1, exploded, section, and contour views
4-57
4-17
Fuze, BD, Model L19A1, functioning views
4-64
4-18
Fuze, BD, Model L24A1, exploded, section, and contour views
4-67
4-19
Fuze, BD, Model L24A1, functioning views
4-74
4-20
Fuze, BD, Model L29A1, exploded, section, and contour views
4-77
4-21
Fuze, BD, Model L29A1, functioning views
4-84
4-22
Fuze, BD, Model L16A1, exploded and cutaway views
4-87
4-23
Fuze, PD, Model L5, M404, Mk 1, exploded and cutaway views
4-95
4-24
Fuze, BD, Model L5, M404, Mk 1, functioning views
4-100
4-25
Fuze, BDSD, Type ?, section view
4-103
4-26
Fuze, BDSD, Type ?, exploded view
4-105
'All figure titles arc UNCLASSIFIED.
4-6
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FOR OFFICIAL USE ONLY
Original AST-1160H-001-75
Fuze, BD, Model BDZ DM 711
FOM No. 1390-16-1-30
(FOUO) Description
According to an official West German source, fuze BDZ DM 711 is a German-produced
copy of US fuze, BD, M91A1. This fuze was standard in the West German Armed Forces at
least as late as 1969. See pertinent US publications (e.g., TM 9-1300-203) for technical
details of this fuze.
(FOUO) Applications (Ammunition and Weapons)
Ammunition
Weapons
90x607-mm cartridge, Model ?
105x617-mm HEP-T cartridge, Model ?
90-mm guns
105-mm guns or howitzers
4-7
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AST-1160H-001-75 Original
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4-8
FOR OFFICIAL USE ONLY
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FOR OFFICIAL USE ONLY
Original AST-1160H-001-75
Fuze, BD, Model BDZ DM 731
FOM No. 1390-16-1-31
(FOUO) Description
Fuze BDZ DM 731 is a West German-produced copy of UK fuze L29A2 or L29A3.
This fuze was standard in the West German Armed Forces at least as late as 1969. See FOM
No. 1390-35-1-3 (fuze L29A2) and FOM 1390-35-1-28 (fuze L29A1), for functioning data
and technical details.
(FOUO) Applications (Ammunition and Weapons)
Ammunition
Weapons
105x617 HESH (HEP) cartridge, Model ?
(probably UK designed and/or produced)
105-mm guns
4-9
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AST-1160H-001-75 Original
(This page intentionally left blank)
4-10
FOR OFFICIAL USE ONLY
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UNCLASSIFIED
OriGina! AST-1160H-001-75
(UNCLASSIFIED)
Figure 4-1. Fine, BI), Model (STRIM),
full view (U).
Description
Fuze, BD, Model (STRIM)
FOM No, 1390-17-24
The French BF) fuze (Fig 4-1) was developed by Societe Technique de Recherches
Industrielles de Mechaniques (STRIM) of Pans. The fuze is a setback-armed type employing
a ribbon spring that unwinds after setback, arming the fuze. It is not considered bore safe by
US standards_
(U) Characteristics
Fuze assembly:
Body material ? Aluminum
Weight ? ? _ 0.11 kg (0.24 lb)
34 min (1.34 in)
Length 69 mm (2.72 in)
4-11
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, BD, Model (STRIM)
FOM No. 1390-17-2-4
(U) Characteristics (Continued)
Detonator:
Explosive
Weight 0.916 g (14.1 gr)
Booster pellet:
Explosive RDX/wax**
Weight 9.24 g (0.020 lb)
Diam 22 mm (0.866 in)
Height 23 mm (0.910 in)
Functional data:
Arming method Setback
Firing method Impact
Safety devices Safety pin; arming spring
Arming distance 4 m
Arming time
? Lead azide, tetryl, potassium chlorate, antimony sulfate, and merctin fulminate.
**Pressed to tit a hemnphencal cavity of the main shaped charge having a radius of 93 nun (0.37 In)
4-12
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UNCLASSIFIED
Original
(U) Design Details (fig 4-2)
AST-1160H-001-75
Fuze, BD, Model (STRIM)
FOM No. 1390-17-2-4
(UNCLASSIFIED)
Figure 4-2. Fuze, BD, Model (STRIM), exploded view (D).
4-13
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UNCLASSIFIED
MT-11601-001-75 Original
Fuze, BD, Model (STRIM)
FOM No. 1390-17-2-4
(U) Design Details (Continued)
The bored-out aluminum fuze body (9) is threaded internally at the forward end to
receive the detonator assembly (11, 12, and 13) and externally for assembly into the base of
the warhead. The rear of the fuze body (9) is sealed by an aluminum closure cover (3).
The arming mechanism consists of a brass setback sleeve (6), steel setback spring (4),
and a ribbon-type steel spring (10). The ribbon-type spring is wound up and positioned
inside a housing (7) and locked in place by the brass ring-shaped retainer (8) with finger-like
prongs.
The firing-pin assembly (5) consists of a steel pin and brass holder, whereas the
detonator assembly includes the detonator holder (13), a felt cushion (12), and the
hemispherical-shaped detonator (11).
The setback sleeve (6) is secured in place by a brass safety pin (2) inserted through an
opening drilled into the side of the fuze body. The brass safety pin is held in place by an
adhesive tape (1) taped around the fuze body.
(U) Functioning
Prior to firing, the adhesive tape (1) and safety pin (2) are removed.
On firing, the setback sleeve (6) moves rearward, compressing its spring (4). The
ring-shaped retainer (8) also moves rearward, expanding its finger-like prongs over the raised
portion of the ribbon spring housing (7).
When setback forces dissipate, expansion of the spring (4) pushes the sleeve (6)
forward as well as the retainer (8), allowing the ribbon-type spring (10) to unwind and
eliminating the obstruction that blocked the firing pin (5) from stabbing the detonator (11).
Upon impact, inertia forces the firing pin to stab the detonator, which in turn sets off
the booster pellet and shaped charge of the warhead.
4-14
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, BD, Model (STRIM)
FOM No. 1390-17-2-4
(U) Modifications
Modifications have been made to this fuze. A set screw replaced staking of the firing
pin. Removal of the safety pin is accomplished by a pull-ring instead of unwinding friction
tape. The firing pin was made longer and the setback spring stronger.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
73-mm HEAT warhead, Model 1950
73-mm rocket launcher, Model 1950
4-15
(Reverse Blank)
UNCLASSIFIED
1
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Original
FIRING PIN
UNCLASSIFIED
AST-1160H-001-75
Fuze, BDSD, Oerlikon, Type BZD-0236
FOM No. 1390-18-1-45
V S*-
FIRING PIN BUSHING
SELF-DESTRUCT SPRING
ARMING BALLS (4)
SHOCK ELEMENT
BOOSTER
DETONATOR
DETONATOR ROTOR
SELF-DESTRUCT HOUSING
Neg. 517131 (UNCLASSIFIED)
Figure 4-3. Fuze, BDSD, Model BZD-0236, section view (U).
(U) Description
The Oerlikon, Type BZD-0236, fuze (fig 4-3) is a conventional BDSD fuze with a
mechanical self-destruct feature and an out-of-line detonator. It is designed for
30x113-mm B API-1E1, Type PSBH/B, cartridges for DEFA 500-series aircraft guns.
4-17
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, BDSD, Oerlikon, Type BZD-0236
FOM No. 1390-18-1-45
(U) Characteristics
Fuze assembly:
Body material Aluminum
Weight 3.4 g
Markings None
Booster:
Body material
Body length
Explosive
Explosive weight
7
7
Functional data:
Arming method Spin
Firing method Impact
Safety devices Out-of-line detonator in ball rotor.
Arming distance
Arming time
Self-destruct time
Delay time 7
(U) Design Details
The fuze consists of an aluminum fuze body containing a self-destruct mechanism,
firing pin, ball rotor with an out-of-line detonator, and booster. In storage and shipment, the
fuze is kept safe by the out-of-line position of the detonator in the rotor. Rotor position is
maintained by pressure from the self-destruct spring and the shock element, acting through
the firing-pin bushing.
(U) Functioning
Upon firing, setback forces cause the firing pin bushing to move to the rear, crushing
the shock element and further compressing the self-destruct spring. At this point, centrifugal
force causes the arming. balls to move outward and rearward against the conical interior
surface of the self-destruct housing. This action moves the firing-pin bushing further
rearward and restrains the self-destruct spring, releasing pressure on the rotor. Centrifugal
448
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, BDSD, Oerlikon, Type BZD-0236
FOM No. 1390-18-1-45
(U) Functioning (Continued)
force causes the unbalanced rotor, now free, to rotate until the detonator is aligned with the
firing pin. Upon impact, inertia added to the pressure of the compressed self-destruct spring
overcomes centrifugal force, acting on the arming balls. These balls are forced inward into
their recess in the firing-pin bushing, and the fixing pin is driven into the detonator, thus
initiating detonation of the booster. If impact does not occur, projectile spin will decay and
centrifugal force decrease until the compressed self-destruct spring overcomes the spin force
on the arming balls and drives the firing pin into the detonator.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
30x113-mm B APHEI, Type PSBH/B
30-mm aircraft gun, DEFA, Type 552
4-19
(Reverse Blank)
UNCLASSIFIED
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CONFIDENTIAL
Original
PIEZOELECTRIC FUZE
EXPLODER
AST-1160H-001-75
Fun, BD, Model (MINIMAN)
FOM No. 1390494-7
CHARGE DISTANCE TUBE
FIN
STABILIZING TUBE
LINER
SHELL BODY
74-MM HEAT PROJECTILE (MINIMAN)
BD, FUZE, (PIEZOELECTRIC TYPE)
(CONFIDENTIAL)
Figure 4-4- Fuze, BD, Model (MINIMAN), full view (U).
4-21
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AST-1160H-001-75 Original
Fuze, BD, Model (MINIMAN)
FOM No. 1390-19-1-7
(C) Description
The Swedish BD fuze (fig 4-4) is a setback-, delayed-arming type that functions on the
piezoelectric principle upon impact with the target. It was developed by Forsvarets
Fabrilcsverk of Eskilstuna, Sweden, for use with the 74-mm HEAT projectile fired from the
74-mm antitank launcher (MINIMAN). The manufacturer claims functioning up through
70? obliquity.
(C) Unique Features
? A piezoid mounted in the base that is excited by the shock wave travelling
through the distance tube and shell body upon impact.
? The use of a diode to provide brush discrimination.
? A ball-race metering system for controlling the spring-driven rotor housing
the electric detonator.
? Detent system on spring-driven rotor.
(C) Characteristics
Fuze assembly:
Body material
Weight
Markings
Booster:
Body material
Body length
Explosive .
Explosive weight
4-22
7
7
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Original AST-1160H-001-75
(C) Characteristics (Continued)
Functional data:
Arming method Setback
Firing method firipact
Safety devices
Arming distance
Arming time
Delay time 7
INNER ASSEMBLY
111
MEZOID ASSEMBLY SBA DEVICE
Neg. 552498
FUZE CASING
Fuze, BD, Model (MINIMAN)
FOM No. 1390-19-1-7
CLOSING PLUG
OUTER ASSEMBLY
CONTACT HOUSING
gla
CONTACT
MB
-..........."ThISSULATING COVERS
DISK
0
0
"BELLEVILLE" SPRINGS
(CONFIDENTIAL)
Figure 4-5. Fuze, BD, Model (MINIMAN), exploded view (U).
(C) Design Details
General. The MINIMAN piezoelectric, BD fuze (fig 4-5) is a compact design. It
consists primarily of a piezoid assembly, S&A device, and contact housing. The inner
assembly is then covered with a transparent, plastic, insulating material and inserted into the
fuze outer assembly. A plastic disk is placed around the contact housing as well as an
"O"-ring and three belleville springs. The closing plug is then screwed into the casing of the
outer assembly until metal-to-metal contact occurs between the casing and plug. The fuze is
threaded at both ends. The forward end is screwed into the base of the projectile.
4-23
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CONFIDENTIAL
AST-1
H-
75
Fuze, BD. Model (MINIMAN
FOM No, 1390-19-1-7
Design Details (Continued)
S&A device (Fig 4-6)
Original
Neg. 552499
Figure 4-6. Fuz
(CONE-10E1171AL)
Model (MINIMAN), disassembled
S&A device (U),
The S&A device consists of a cylindrical, slotted S&A housing bored out and machined
to facilitate a flat rotor spring, ball raceway, sun disk and delayed-arming cylinder housing
the rotor and a slotted rotor spring stud.
The delayed-arming cylinder also has holes drilled to accommodate four balls
metering the motion of the spring-driven which houses an Insulated elect
detonator. The center set screw locks the detonator contained in the rotor.
In addition, there are two cletent balls detenting the rotor lock pm. These balls are held
in place by two spring-loaded pins in adjacent holes. These pins release the derent balls on
setback, The lung retainer pin shown above retains the rotor and delayed-arming cylinder in
the S&A housing.
4-24
CON F DENTIAL
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CONFIDENTIAL
Original AST-1160H-0111-75
Fuze, BD, Model (M1NIMAN)
FOM No. 1390-19-1-7
(C) Design Details (Continued)
The S&A housing is grooved to provide spaCe for the diode of the piezoid assembly.
The detonator is of the grounded-case design with an insulated center contact.
Piezoid assembly.
uUflPiIJLI IAL)
Figure 4-7. Fuze, BD, Model (MINIMAN), piezoid assembly (U).
The piezoid assembly (fig 4-7) consists of a bleeder-type resistor, "D"-shaped piezoid
or crystal, and diode. The crystal is made of lead-zirconate-titanate material placed between
two metallic collectors. The piezoid is a high-impedance type excited by the shock travel
generated upon impact with the target. The diode permits brush discrimination and
precludes functioning when the projectile brushes leaves or twigs during flight.
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AST-1160H-001-75
Fuze, BD, Model (MINIMAN)
FOM No. 1390-19-1-7
(U) Functioning
Neg. 552500
WARHEAD
INITIATION
CONFIDENTIAL
SBA DEVICE
SECT B-8
INSULATING COVER
j
r7741, A A
DETONATOR CONTACT IS/
DETONATOR
ROTATION 2700
Origiril
ROTOR LOCK
SECT A-A ROTOR LOCK PIN
DETENT BALL (2
r_ WRING LOADED
PIN (21
(CONFIDENTIAL)
Figure 4-8. Fuze, BD, Model (MINIMAN), section view
of S&A device (U).
The S&A device (fig 4-8) arms by setback during acceleration at launch. Upon setback,
the spring-loaded pins move rearward, releasing the two balls, undenting and releasing the
rotor lock pin. The rotor which houses the detonator is now driven to electrical alignment
by the rotor spring. The rotor motion is metered or controlled via the ball raceway
mechanism. The rotor moves 270?, pressing through the aligned position with the detonator
upside down. The contact pin can only enter the rotor and contact the detonator button
when it comes to rest at the rotor stop pin. The contact pin also serves to lock the rotor
once armed.
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UNCLASSIFILV
Original AST-1160 H-001-75
Fuze, BD, Model (MINIMAN)
FOM No. 1390-19-1-7
(U) Functioning (Continued)
Upon impact with the target, the shock wave travels through the distance tube and
projectile body to the piezoid. The piezoid is then excited and produces the necessary
voltage to fire the electric detonator and, in turn, detonate the booster and the shaped
charge of the projectile.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
74-mm HEAT projectile
74-mm RCLS antitank weapon (MINIMAN)
4-27
(Reverse Blank)
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CONFIDENTIAL
Original
IA" DIA ss
(12 Threads per lath 1.11) _
SEPTUM - -
BOXCLOTH
WASHER
BASE MARKINGS
(C) Description
ROTOR
ROTOR
SPRING
AST-1160H-001-75
Fuze, BD, Model No. 303 Mk 1
FOM No. 1390-35-1-1
MAGAZINE CAP - -
C. E. PELLET
STEMME0 PLUG
CE. STEMMED
ROTOR PLUG
ARRESTER PIN
DETONATOR ASSEMBLY
? (I? GR.
BODY
OETENT
DETENT SPRING
STRIKER
STRIKER SPRING
CENTRIFUGAL PLUNGER
(TWO)
COLLAR
SHEAR WIRE
BASE PLUG
(CONFIDENTIAL)
Figure 4-9. Fuze, BD, Model No. 303 Mk 1, contour
and cutaway views (U).
The No. 303 Mk 1 BD fuze (fig 4-9) is a setback- and centrifugally-armed type which
functions upon impact. It was developed by the United Kingdom for use with 165-mm
HESH ammunition fired from the L9A1 gun mounted on the armored reconnaissance
vehicle (AVRE). This fuze is bore safe by US standards.
(C) Unique Features
? Setback pin detenting torqued spring-loaded rotor housing an out-of-line
detonator.
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CONFIDENTIAL
AST-1160H-001-75 Original
Fuze, BD, Model No. 303 Mk 1
FOM No. 1390-35-1-1
(C) Characteristics
Fuze assembly:
Body material Aluminum
Weight
Markings 303 MK R.L.46
Length 99 mm (3.901 in)
Thread diam 40.6 mm (1.60 in)
TPI 12 (LH)
Booster:
Body material
Body length 25.4 mm (1.00 in)
Explosive Tetryl
Explosive weight 28.3 g (0.062 lb)
Functional data:
Arming method
Firing method
Safety devices
Arming distance
Arming time
(C) Design Details
Setback & centrifugal force
Impact
2
General. The No. 303 Mk 1 BD fuze (fig 4-9) consists principally of a body, magazine,
stemmed plug, rotor plug, rotor assembly, arrester pin, detent and detent spring, striker and
striker spring, centrifugal plunger, collar, shear wire, and base plug.
Body. The body is made of aluminum. Externally it is formed with an enlarged
portion at the base, above which it is screw-threaded to 1.6-in (41-mm) diameter (12 TPI,
left hand) to suit the fuze hole in the base of the shell. Above the threaded portion, it is of
slightly reduced diameter and formed plain; at the top, it is further reduced in diameter, an
undercut being made above which it is screw-threaded to accept a cap that forms the
*Arrester and setback pins detent A torqued rotor that houses a line detonator, two centrifugal plungers detenting firing
pin and shear wire.
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CONFIDENTIAL
Origins AST-1160H-001-75
Fuze, BD, Model No. 303 Mk 1
FOM No. 1390-35-1-1
(C) Design Details (Continued)
magazine. Two flats are formed on the sides of the enlarged portion to facilitate assembly or
removal from the shell.
From the base, a hole is bored in the center of the body to house the striker and striker
spring, while off center three holes are bored: one to house the detent and detent spring, the
other two to lighten the body and also act as vents to relieve pressure should the detonator
be fired prematurely. A hole is also drilled in the center of the top and screw-threaded to
take the arrester pin. Below the stemmed plug, a larger hole is drilled through the side of the
body to house the rotor assembly which, after insertion, is retained in position and sealed
by screwing home the rotor plug. This horizontal hole also connects with one of the vent
holes bored from the base of the body. Another hole is bored through the side of the
enlarged portion of the body at the base to accept the two centrifugal plungers which are
retained in position by screwed plugs. Two blue bands are painted around the base portion
of the fuze.
Magazine (i.e., booster). The magazine consists of a cup-shaped flat-bottom cap,
threaded internally .at the mouth to screw on to the top of the fuze body. A hole is also
formed in the top, being closed by a brass septum, beneath which is inserted a box-cloth
washer. A CE pellet weighing approximately 1 oz (28.35 grams) is assembled in the
magazine.
Stemmed plug. The plug is of metal, screw-threaded externally, with a hole drilled
through the center leaving a thin diaphragm of metal at the base. This recess is filled with
CE stemmed in (i.e., tetryl filled) and retained in position by a paper disk shellaced to the
top surface of the plug. The plug is screwed into the hole formed in the center of the top of
the body.
Rotor plug. This is made of metal, screw-threaded externally, with a screwdriver slot
cut across the base. Internally, it is recessed to fit over the end of the rotor assembly. It is
assembled in the side of the body behind the rotor assembly.
Arrester pin. This is made of metal, formed with a cylindrical shank and an enlarged
screw-threaded head. It screws into the hole formed off center in the top of the body, the
shank or stem emerging through the bottom of the hole acts as a stop or arrester when the
detent sets back and the rotor assembly revolves under the influence of the rotor spring.
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CONFIDENTIAL
AST-1160H-001-75 Original
Fuze, BD, Model No. 303 Mk 1
FOM No. 1390-35-1-1
(C) Design Details (Continued)
Rotor assembly. The rotor assembly consists of a cylindrical housing, with a rotor,
rotor spring, detonator plug and 1.7-g (0.11-gram) "A" (copper alloy shell) detonator,
distance piece, and lead-azide CE (i.e., tetryl) sleeve. A hole bored in the side of the rotor
accommodates the lead-azide sleeve, above which is inserted the distance piece and
detonator housed in the detonator plug. One end of the rotor is closed and formed with a
spigot or boss, over which is assembled a cylindrical-coiled rotor spring. Slots are cut in the
sides of the open end of the rotor: the end of the detent engages in the smaller slot; the
other, which is wider, acts as a stop when it comes into contact with the stem of the arrester
pin when the rotor revolves.
Detent (setback pin). The decent is made of steel and consists of a rod with a
cylindrical flanged head, a collar being formed about the center of the rod to act as a guide.
Inserted from the base of the body, it seats on the detent spring. The stem of the detent
engages in a slot in the rotor assembly and retains it in the unarmed position until the shell
is fired.
Detent spring (setback spring). This is a cylindrical-coiled steel wire spring which is
positioned behind the detent.
Striker (firing pin). The striker is made of steel, in the form of a rod with a needle
point at the front. At the lower portion of the rod, two collars are formed which act as
centering bands, the portion between the collars forming a recess into which the centrifugal
plungers engage. A small spigot is formed at the rear of the striker, and a small hole to
accept a copper shear wire is drilled through it.
Striker spring. The striker spring is a cylindrical-coiled steel-wire spring which is
assembled over the stem of the striker, the top coil resting below an undercut formed in the
top of the channel of the body.
Centrifugal plungers. The plungers consist of a short stem with an enlarged cylindrical
head. A recess formed in the top of the head makes a seating for the coiled spring. The
plungers are inserted through the side of the body, the holes being closed by screwed plugs.
The stems of the plungers engage in the recess between the two collars formed on the striker
and prevent the striker from moving forward until the plungers are withdrawn by centrifugal
force.
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CONFIDENTIAL
Original
(C) Design Details (Continued)
AST-1160H-001-75
Fuze, BD, Model No. 303 Mk 1
FOM No. 1390-35-1-1
Collar. The collar is inserted over the spigot formed at the rear of the striker and
secured by the shear wire, which is inserted in holes drilled through the collar and spigot. In
flight, the shear wire in the collar prevents the striker from moving forward after the plunger
is disengaged by centrifugal force.
Base plug. The base plug is a solid screw-threaded disk. Two grooves are formed on its
inner face, connecting the two vents drilled in the body. Two holes, diametrically opposite,
are formed on the outer surface of the base for the assembly tool.
(C) Functioning
3 go
BASE MARKINGS
8
I 60 DIAM
121P1 (LH)
9
All dimension* In Inch*.
Neg. 507912
Neg. 507972 (UNCLASSIFIED)
Figure 4-10. Fuze, BD, Model No. 303 Mk 1, section view (U).
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CONFIDENTIAL
AST1160H-001-75 Original
Fuze, BD, Model No. 303 Mk 1
FOM No. 1390-35-1-1
(C) Functioning (Continued)
The No. 303 Mk 1 BD fuze (fig 4-10) requires both centrifugal and setback forces to
arm. Upon firing the projectile, setback forces the detent (8) to the rear, compressing its
spring (9). This motion of the detent releases the rotor (7). When setback ceases, the rotor
rotates a quarter of a turn, bringing the detonator (3) into line. At the same time,
centrifugal forces move the two spin detcnts (5) out, releasing the firing pm (4). The fuze is
now fully armed; however, the detonator and the firing pin are kept separated by the shear
wire (6) and the firing-pin spring.
On impact, the shear wire is broken and the firing pin moves forward, compressing the
spring and piercing the detonator. In turn, the detonator initiates the tetryl lead (2) and the
booster (1).
(C) Applications (Ammunition and Weapons)
Ammunition
Weapons
165-mm HESH projectile, Model LI, Mk1
165-mm AVRE with Model L9A1 gun
(C) Remarks
Although this fuze was declared obsolete in 1962, it has good design features that
warrant incorporation into this handbook.
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UNCLASSIFIED
Original
(U) General
AST-1160H-001-75
Fuze, BD, Model 1,29A2
FOM No. 1390-35-1-3
Neg. 507974 (UNCLASSIFIED)
Figure 441. Fuze, BD, Model L29A2, contour view (U).
The L29A2 (fig 4-11) is a delayed-arming, graze-sensitive, BD fuze designed to function
on impact with the target. Except for minor modifications to the delayed-arming shutter
and detonator, the L29A2 is similar in design and functioning to the UK L29A1 design (see
FOM No. 1390-35-1-28).
4-35
(Reverse Blank)
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CONFIDENTIAL
Original AST-116014001-75
Fine, BD, Model L24A2
FOM No. 1390-35-1-7
(C) General
The L24A2 is a delayed-arming, graze-sensitive, BD fuze similar in design and
functioning to that of the L24A1 (see FOM No. 1390-35-1-27) except for the
delayed-arming shutter and detonator.
(C) Application (Ammunition and Weapons)
Ammunition
Weapons
165-mm MESH projectile, Model L33A1
165-mm AVRE guns, Model L9A1
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AST-1160H-001-75 Original
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CONFIDENTIAL
Original AST-1160H-001-75
Fuze, BD, Model L19A4
FOM No. 1390-354-4
(C) General
The L19A4 fuze is standard for use with 76-mm, 25-pounder, 105-mm, and 120-mm
HESH projectiles. It is similar in design and functioning to the earlier L19A1 (see FOM
No. 1390-35-1-26), L18A2, and L19A3 models. It is a delayed-arming, graze-sensitive, BD
fuze. The only differences between the L19 series fuzes are the minor changes in the
delayed-arming shutter and the detonator.
(C) Application (Ammunition and Weapons)
Ammunition
Weapons
76-mm, 25-pounder, 105-mm, and 120-mm
HESH projectiles
76-mm gun, Model 15A1, on Saladin or
Scorpion armored cars; 25-pounder
gun/howitzer, Mk 2; 105-mm tank gun,
Model L7A1; 120-mm RCLS BAT gun;
120-mm tank gun, Model Ll
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AST-1160H-001-75
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Original
(
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CONFIDENTIAL
Original
4 90
SI
UNARMED
AST-1160H-001-75
Fuze, BD, Model L10 Mk 1
FOM No. 1390-35-1-24
- MAGAZINE CAP SEGMENT
MAGAZINE
C E PELLET
STEMMED C E
SHUTTER
LOCKING PLATE 7
DETONATOR 12 8 OR AZ/
RETAINING PLUNGER STRIP
? SAFETY PLUNGER
_ No 1 DELAYED
ARMING SHUTTER HOD
? SECURING SCREW
COVER PLATE
112 UNS Threads inch 2A LHI
- 2.10" DIAM ?
TRACER CAVITY
' STRIKER COVER PALLET
STRIKER
' CREEP SPRING
STRIKER HOLDER
SHUTTER
RETAINING
SCREW
ESCAPE WHEEL
AND PINION
800Y SEGMENT
Neg. 552501 (CONFIDENTIAL)
Figure 4-12. Fuze, BD, Model L10 Mk 1, contour and section views (U).
(C) Description
The L10 Mk 1 (fig 4-12) is a delayed-arming, graze-sensitive, BD fine designed for use
with HESH projectiles fired from the UK 25-pounder gun. It is considered bore safe by US
standards. The fuze arms within 0.06 second, with the projectile spinning at 5900 r/min.
(C) Unique Features
? Shutter housing out-of-line detonator.
? Escapement controlling movement of shutter.
? Spring-loaded safety plunger engaging locking plate detenting shutter.
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CONFIDENTIAL
AST-1160H-001-75
Fuze, BD, Model L10 Mk 1
FOM No. 1390-35-1-24
(C) Characteristics
Fuze assembly:
Body material
Weight
Markings
Max length
Thread diam
TPI
Booster:
Body material
Body length
Explosive
Explosive weight
Anodized aluminum alloy
L10 Mk 1
4.90 in (124.46 mm)
1.80 in (45.72 mm)
12
Anodized aluminum alloy
Tetryl
Functional data:
Arming method Setback & centrifugal force
Firing method Impact
Safety devices
Arming distance
Arming time 0.06 s
(C) Design Details
Original
General. The L10 Mk 1 fuze (fig 4-12) incorporates a delayed-arming shutter. It
consists principally of a body, magazine and cap, striker assembly and cover, creep spring,
and delayed-arming shutter No. 1 containing a 0.18 gram (2.8 gr) "AZ" detonator.
Body. The body is made of anodized aluminum alloy. It is cylindrical in shape with a
wide flange formed at the base, above which it is externally threaded to 1.8-inch
(45.72-mm) diameter (12 UNS TPI-2A, left hand) to suit the fuze hole of the shell for
approximately a quarter of its length; the remainder of the body is left plain. A hole is
drilled in the center of the base and threaded to accept a tracer adapter (120-mm [4.72-in]
shell only). Two holes, diametrically opposite, are also formed in the base to enable the fuze
'Salk Ly plungLr, locking platc, and out-of-line detonator.
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CONFIDENTIAL
Original AST-1160H-001-75
Fuze, BD, Model LW Mk 1
FOM No. 1390-35-1-24
(C) Design Details (Continued)
to be inserted or removed from the shell. The base of the body and flange is coated with
varnish RD 1177 after lot and filler data have been stamped on the base. Internally, the
body is bored to three diameters, the smaller at the base to accommodate the striker
assembly, the second shorter but slightly larger in diameter and threaded to take the striker
cover, while the third and largest is threaded at the mouth. This recess accommodates the
delayed-arming shutter above which the magazine is screwed home.
Magazine (i.e., booster). The magazine is made of anodized aluminum alloy. The
magazine is cup-shaped and threaded externally for about two-thirds of its length; the
remaining portion is left plain. Two key slots are formed on its outer rim to facilitate
assembly. Internally, a small recess is drilled in the bottom, leaving a thin diaphragm of
metal between the recess and the outer surface of the base of the magazine. This small recess
in the bottom of the magazine is filled with tetryl, while a prepressed pellet of tetryl is
inserted in the larger recess. The threads of the magazine are coated with composition
RD 1285 or 1285 A, and it is then screwed into the open end of the fuze body, the base of
the magazine resting above the delayed-arming shutter. The outer end of the magazine
protrudes outside the body of the fuze and is closed by a magazine cap.
Magazine cap. The magazine cap is made of anodized aluminum alloy. The cap is
cup-shaped, the inner rim being threaded to engage over the mouth of the magazine.
Striker assembly. The striker assembly consists of a holder, needle striker, and plug.
? Striker holder. The weighted, cylindrical striker holder is made of steel
electroplated with zinc. It is formed in two diameters with a small recess
formed in the base and a hole bored through the center to house the
needle striker.
? Needle striker (firing pin). Made of steel electroplated with zinc, the
needle striker is formed with a stem with a sharp point and a flanged head.
? Plug. The plug is a flat disk of brass formed with a hole through the
center.
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AST-116011-001-75
Fuze, BD, Model L10 Mk 1
FOM No. 1390-35-1-24
(C) Design Details (Continued)
Origins
The stem of the needle striker protrudes through the hole bored in the striker holder. The
needle striker is retained in the holder by the brass plug, which is assembled behind its
flanged head and secured by spinning over a lip formed on the base of the holder. After
turning over the lip, the needle striker must be free to move sideways in the hole in the
striker holder. The striker assembly is inserted into the fuze body together with the creep
spring and is retained in position by screwing home the striker cover.
Striker cover. Made of anodized aluminum alloy, the striker cover is in the form of a
disk, the outer rim of which is threaded. The underside is recessed to make a seating for the
top of the creep spring. A small hole is also drilled in the center through which the point of
the striker emerges when the striker holder sets forward on impact or graze.
Creep spring. The creep spring is made of steel, tinned and electroplated with zinc.
The cylindrical coded spring has four effective coils of 0.040-inch (10.15-mm) diameter,
with one coil at each end close coiled and ground square with the axis of the spring. It is
assembled around the top portion of the striker holder and prevents the holder from
creeping forward while the shell is in flight. It is retained in position by the striker cover.
Delayed-arming shutter No. 1. The assembly comprises four main components, an
aluminum-alloy circular-shaped body, the escapement, a steel electroplated with zinc safety
plunger with spring, and an anodized aluminum alloy rotary type shutter containing a 2.8-g
(0.18-gram) "AZ" lugless (tinned copper-alloy cup) detonator. The shutter is held in the
unarmed position by means of a spring-loaded safety plunger which engages in a locking
plate. The safety plunger is retained in a recess formed in one side of the shutter body by a
plunger retaining strip. On spin, the safety plunger, overcoming its spring, disengages from
the recess in the end of the locking plate by the influence of centrifugal force, and the
lead-weighted, biased shutter rotates until the detonator in it is in a central position over the
striker nose. The plunger retaining strip, which engages in a slot cut in the sidc of the
plunger, retains the plunger in its recess in the shutter body and prevents it from moving
into the shutter housing when the plunger spring reasserts itself, thus obviating the
possibility that the shutter and delayed-arming mechanism will be fouled by the plunger.
The locking plate, which fits into a slot made across the face of the shutter, moves out and
when the shutter reaches the fully armed position engages in a recess made in the outer side
of the shutter body, thus locking the shutter in the armed position. The delay is obtained by
means of a pallet and escape wheel mechanism positioned beneath the shutter. The escape
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1...carmutri I IAL
Original AST-1160H-001-75
Fuze, BD, Model L10 Mk 1
FOM No. 1390-35-1-24
(C) Design Details (Continued)
wheel is fitted with a pinion which is in mesh with a segment on the side of the shutter. The
pallet acts as a pendulum and engages successive teeth in the escape wheel to retard the
rotary movement of the shutter. The approximate time of arming is 0.06 second from the
time the shutter commences to open, which occurs when the shell is spinning at 5900 r/min.
A coverplate, made of aluminum alloy is assembled on the base of the shutter body and is
retained in position by securing screws. It is prepared to accept the pivot pins of the shutter
and escape wheel. The shutter body is fitted in the fuze body below the magazine which,
when assembled, holds it in position. It is also secured by a screw inserted through the side
of the fuze body. The threads and slotted head of the screw are coated with composition
RD 1285 or 1285 A at the time of assembly.
(C) Safety
Safety is provided as follows:
? The shutter is retained in the unarmed position by the spring-loaded
safety plunger, which engages in a shutter locking plate.
? When the shutter is in the unarmed position, its detonator is screened off
from the striker and from the tetryl-filled channel leading to the tetryl
pellet in the magazine.
? The shutter is designed to provide a slight delay before it reaches the
armed position. The appropriate time of operation is 0.06 second at
5900 drain.
? The creep spring prevents the striker holder and striker from moving
forward during flight.
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CONFIDENTIAL
AST-116011-001-75
Fuze, BD, Model L10 Mk 1
FOM No. 1390-35-1-24
(C) Functioning
ACTION OF NO I DELAYED ARMING SHUTTER
SHUTTER UNARMED
DURING FLIGHT
SAFETY
PLUNGER
DURING FLIGHT
ESCAPE WHEEL
AND PINION
2
3
SHUTTER ARMED
LOCKING
PLATE
. SHUTTER
DURING
FLIGHT
DETONATOR
STRIKER
CREEP
SPRING
Original
(CONFIDENTIAL)
Figure 4-13. Fuze, BD, Model L10 Mk 1, functioning views (U).
On firing, the shutter and striker-needle holder set back and are retained in the
unarmed position by friction.
During flight, the safety plunger overcomes its spring and moves outWard to release the
shutter. The plunger retaining strip, which engages in a slot cut in the side of the plunger,
retains the latter and prevents it from leaving its recess in the shutter housing when the
plunger spring reasserts itself, thus obviating the possibility that the shutter and
delayed-arming mechanism will be fouled by the plunger. The shutter begins to rotate until
its detonator reaches a central position directly in alignment with the striker needle and the
stemmed CE (tetryl) leading to the CE pellet in the magazine. The delay is obtained by
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CONFIDENTIAL
Original AST-1160H-001-75
Fuze, BD, Model L10 Mk 1
FOM No. 1390-35-1-24
(C) Functioning (Continued)
means of a pallet and escape wheel mechanism positioned beneath the shutter. The escape
wheel is fitted with a pinion which is in mesh with a segment on the shutter. The pallet acts
as a pendulum and engages successive teeth in the escape wheel to retard the rotary
movement of the shutter. When the shutter reaches the fully armed position, it is locked by
the locking plate, which moves outwards along its slot in the top face of the shutter to
engage in a recess in the shutter housing.
On impact or graze, the momentum of the striker holder overcomes the creep spring
and carries the striker forward for the point to pierce the detonator. The resultant
detonating wave is transmitted through the stemmed CE (tetryl) in the magazine channel, to
the CE pellet in the magazine and thence on to detonate the bursting charge in the shell.
(C) Application (Ammunition and Weapons)
Ammunition
Weapons
HESH projectiles
QF 25-pounder gun
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AST-1160O-001-75 Original
i
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CONFIDENTIAL
Original
UNARMED
MAGAZINE CAP
MAGAZINE
C E PELLET
STEMMED C E
SHUTTER SHUTTER
LOCKING PLATE
DETONATOR (28 GR , 421
RETAINING PLUNGER STRIP
SAFETY PLUNGER -----
NO 3 DELAYED ARMING
SHUTTER BODY
- SECURING SCREW.
AST-1160H4101-75
Fuze, BD, Model L15A2
FOM No. 1390-35-1-25
SEGMENT
1 80" DIAM
(12 UNS Threads per inch 1.4 LH/
TRACER CAVITY
Neg. 552502
(C) Description
COVER PLATE
WASHER PALLET SHUTTER RETAINING
SEGMENT SCREW
NEEDLE
ESCAPE WHEEL
AND PINION
SEGMENT HOLDER
COVER
CREEP SPRING
STRIKER HOLDER
BODY SEGMENT HOLDER
SEGMENTS
Figure 4-14. Fuze, BD, Model L15A2, contour
and section views (U).
(CONFIDENTIAL)
The Li 5A2 (fig 4-14) is a delayed-arming, graze-sensitive, BD fuze designed to function
upon impact with the target. It is intended for use with HESH ammunition fired from the
120-mm tank gun, Ll. The L15A2 is both bore and muzzle safe.
(C) Unique Features
? Shutter housing out-of-line detonator.
? Escapement controlling movement of shutter.
? Spring-loaded safety plunger detenting shutter.
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CONFIDENTIAL
AST-1160H-001-75
Fuze, OD, Model L15A2
FOM No. 1390-35-1-25
(C) Characteristics
Fuze assembly:
Body material
Weight
Markings
Length
TPI
Booster:
Body material
Body length
Explosive Tetryl
Anodized aluminum alloy
7
L15A1
4.90 in (124.46 mm)
12
Anodized aluminum alloy
Explosive weight
Functional data:
Arming method
Firing method
Safety devices
Arming distance
Arming time
(C) Design Details
Setback & centrifugal force
Impact
Spring-loaded safety plunger
& safety locking plate
7
0.02 to 0.06 s
Original
General. The L15A2 BD fuze (fig 4-14) consists principally of a body, striker
assembly, creep spring, striker locking-segment assembly, delayed-arming shutter No. 3
containing a 2.8-gr (0.18-gram) "AZ" detonator, magazine and cap.
Body. The body is made of anodized aluminum alloy. It is cylindrical in shape with a
wide flange formed at the base, above which it is externally threaded to 1.80-inch
(45.72-mm) diameter (12 UNS TPI 2A, left hand) for approximately a quarter of its length
to screw into the base of the shell. Above the threaded portion, the remainder of the body is
left plain. A hole is drilled in the center of the base and threaded to accept a tracer-adapter
(120-mm Ll TK shell only). Two holes, diametrically opposite, are also formed in the base
to enable the fuze to be inserted or removed from the shell, internally, the body is bored
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Origins
(C) Design Details (Continued)
AST-1160H-001-75
Fuze, BD, Model L15A2
FOM No. 1390-35-1-25
from the top in four diameters: the smaller at the base to accommodate the striker assembly
and creep spring; the second and third, which are slightly larger in diameter, accommodate
the striker locking segment assembly; while the fourth and largest is threaded at the mouth.
This larger recess accommodates the delayed-arming shutter assembly, above which the
magazine is assembled. The base and the flange of the body are coated with varnish after the
markings have been stamped on.
Striker assembly. This consists of a brass, electrotinned, cylindrical body with a flange
at the base, above which it is formed on three decreasing diameters, a recess being formed in
the top of the smallest diameter to accept the base portion of the electroplated tin- or
zinc-coated steel needle (firing pin), the stem of which, on assembly in the fine, protrudes
through the center of the two striker locking segments. The needle, the base of which is
flanged, is retained in the recess in the top of the striker body by a tin-coated brass washer,
which is secured by spinning over the lip of the recess. The needle is free to move sideways
in the recess. The striker assembly is inserted into the cavity in the base of the fuze body
together with the creep spring, which is assembled around the larger diameter of the striker
body, the bottom coil resting on the flange. The creep spring is retained under initial
compression by the top coil, seating in a recess and bearing against the base of the striker
locking-segment holder.
Creep spring. The creep spring is a cylindrical-coiled, tinned, steel-wire spring with
four effective coils of 0.056-inch (1.42-mm) diameter wire, one coil at each end being close
coiled and ground square with the axis of the spring. It is assembled around the larger
diameter of the striker body and prevents the assembled striker from creeping forward when
the shell is in flight and the locking segments open under the influence of centrifugal force.
Striker-locking segment assembly. This is assembled in the fuze body, the lower
portion fitting over the top of the striker. It is retained in position by a screw inserted
through the side of the fuze body, the shank of which bears on the striker locking segment
cover. The striker-locking segment assembly comprises a holder, two electrotin-plated steel
pins, two springs, two segments, a washer, and a cover.
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AST-1160E1-001-75 Original
Fuze, BD, Model L15A2
FOM No. 1390-35-1-25
(C) Design Details (Continued)
Holder. The holder is made of anodized aluminum alloy and is cylindrical in shape.
Externally, it is formed on two diameters, the larger being at the top. The bottom portion
of the larger diameter is chamfered to blend with the smaller. The bottom of the smaller
diameter is also chamfered. Internally from the base it is bored out in two diameters, while a
recess is formed in the top face to house the two locking segments, leaving a platform of
metal between the top and bottom. A hole, the lower edge of which is chamfered, is drilled
through the center of the platform to permit the stem of the striker to pass through. In the
base of the recess in the top of the holder, near the periphery, two holes, diametrically
opposite, are drilled to accept the steel pins, over which are assembled the coiled springs and
the segments. When assembled, the tops of the two pins protrude above the top surface of
the holder.
Segments. The segments are made of aluminum alloy and are perfectly flat, irregular,
arc-shaped fitments. One end is in the form of a toe which is machined to act as a working
surface when the two segments are assembled in the unarmed or locked position, the other
end is wider and acts as a weight which, under the influence of centrifugal force, overcomes
the springs and allows the two segments to open outwards. Two holes are drilled near the
toe, the larger to fit over the pin on which the segment pivots, the smaller accommodating
the turned-up end of die segment spnng. In the closed or unarmed position, the top portion
of the striker bears against the underside of the closed segments, and thus the striker is
prevented from moving forward until the segments are opened by centrifugal force.
Segment springs. These springs are made of 0.022-inch (0.55-mm) diameter tinned-steel
wire, with 6.2 close-wound coils, the ends of the wire being bent up at right angles to the
coils. These are assembled over the pivot pins and beneath the segments, the lower end of
the spring fitting into a small hole drilled in the holder adjacent to the pin, while the upper
end of the spring is located in a small hole drilled in the segment.
Washer. Made of aluminum alloy, the washer is in the form of a flat disk with a hole
formed in the center, and two slots, diametrically opposite, near the periphery. It is
assembled on top of the holder, the protruding ends of the pivot pins being located in the
slots, and the pivot of the striker needle protruding through the center hole.
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Original AST-1160H-001-M
Fuze, BD, Model L15A2
FOM No. 1390-35-1-25
(C) Design Details (Continued)
Cover. The cover is made of aluminum alloy, formed with a large hole in the center. It
fits over the top of the holder and retains the washer in position above the segments. It is
secured in position by spinning the bottom edge around the external chamfered portion of
the holder.
Delayed-arming shutter No. 3. (See sec VIII) This consists of four main components,
the body, the escapement, a safety plunger with spring, and a rotary-type shutter containing
a 0.18-gam (2.77-gr) "AZ" lugless (tinned copper alloy cup) detonator assembled in a
circular-shaped shutter body. The shutter is held in the unarmed position by means of a
spring-loaded safety plunger which engages in a locking plate. The safety plunger is retained
in a recess in the side of the shutter body by a plunger retaining strip. On spin, the safety
plunger overcomes its spring and disengages from the recess in the end of the locking plate
under the influence of centrifugal force, and the lead-weighted biased shutter rotates until
the detonator is in a central position over the striker hole. The plunger retaining strip, which
engages in a slot cut in the side of the plunger, retains the plunger in its recess in the shutter
body.
The locking plate, which fits into a slot made across the face of the shutter, moves out
and engages in a recess made in the outer side of the shutter body, thus locking the shutter
in the armed position. The delay is obtained by means of a pallet and pinion mechanism
positioned beneath the shutter, and this oscillates a segment by means of a 'scape (escape)
wheel and pinion which retards the opening of the shutter. The shutter commences to open
when the projectile is spinning between 7000 and 8500 r/min. The time of opening is
between 0.020 and 0.055 second when the projectile is spinning at 9000 r/min. The
delayed-arming shutter assembly is assembled in the fuze body below the magazine. It is
located and prevented from revolving by a screw inserted through the side of the fuze body
which enters a slot formed in the side of the shutter body. It is further secured by a screw
inserted through the side of the fuze body, the stem of which enters a hole drilled in the
shutter body. The threads of both screws are coated with cement. The junction of the
thread is stabbed after screwing home. The slotted end of the screw is then Coated with
cement.
Magazine (i.e., booster). The magazine is made of anodized aluminum alloy. It is
cup-shaped and threaded externally commencing at the mouth for about two-thirds of its
length, the remaining portion being slightly reduced in diameter and left plain. Two slots are
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CONFIDENTIAL
AST-116011-001-75 Original
Fuze, BD, Model L15A2
FOM No. 1390-35-1-25
(C) Design Details (Continued)
formed in the outer rim to facilitate assembly. Internally, the magazine is bored out to take
a prepressed pellet of tetryl and a small recess, filled with loose tetryl stemmed in, is drilled
in the center of the bottom, leaving a thin diaphragm of metal between the recess and the
outer surface at the base of the magazine. The magazine is screwed into the open end of the
fuze body, the base of the magazine resting above the delayed-arming shutter assembly. The
outer end of the magazine protrudes above the body of the fuze and is closed by a magazine
cap.
Magazine cap. The cap is made of anodized aluminum alloy. It is cup-shaped with an
internal thread to screw over the mouth of the magazine; the threads are coated with
RD 1285 or 1285 A prior to assembly.
(C) Safety
Safety is provided as follows:
? The rotating delayed-arming shutter is retained in the safe or unarmed
position by the spring-loaded safety plunger which engages in the safety
locking plate. This provides bore and muzzle safety to cover a specified
minimum distance from the gun.
? When the shutter is in the unarmed position, its detonator is screened off
from the striker and from the stemmed tetryl channel leading to the tetryl
pellet in the body of the magazine.
? The shutter is designed to provide a slight delay before it reaches the
armed position. The approximate time of operation is 0.020 to
0.055 second at 9000 r/min.
? The striker locking segments prevent the striker from moving forward
before firing and hold the striker in the "SAFE" position in transit,
handling, and loading.
? The creep spring prevents the tendency of the striker to move forward
during flight, due to deceleration after leaving the muzzle.
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Original
(C) Func dolling (Fig 415)
ACTION OF N0.3 DELAYED ARMING SHUTTER
SHUTTER UNARMED
MIMING FEIGN!
T.T
,A CIV
EIDE
'PLONDER
PAI[ .EI
DURING FLIGHT
ESCAPE WEEEL
ANO PODON
SEGNIENr
SHUTTER ARMED
LOC XIND LLD?
EIATE LD LA ID 1?.
SHUT-LLD DE lAINA DOR
DUAING FLIGHT
AST4160H-0111-75
Fuze, BD, Model LI 5A2
FOM No. 1390-354-25
SEGMENTS ARMED.
umtAms
NEEDLE
STMICFR -
?CREEP SPumuT
ON IMPACT
(CONFIDENTI -1/2L)
Figure 445.. flue, BD, Model LI 5A2, functioning views (IL)?
On firing, the shutter, striker locking segments, and striker setback are retained in the
unarmed position by friction.
During flight, the segments in the striker-lucking assembly move outward against their
springs, leaving a clear passage for the striker to move forward. The safety plunger
overcomes its spring and moves outwards to release the shutter. The shutter begins to rotate
until its detonator reaches a central position directly in alignment with the striker needle
and the stemmed tetryl channel leading to the magazine. The delay is obtained by means of
a pallet and escape wheel mechanism positioned beneath the shutter, The escape wheel is
fitted with a pinion that is in mesh with a segment on the side of the shutter. The pallet acts
as a pendulum and engages successive teeth in the escape wheel to retard the rotary
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CONFIDENTIAL
AST-1160H-001-75 Original
Fuze, BD, Model L15A2
FOM No. 1390-35-1-25
(C) Functioning (Continued)
movement of the shutter. When the shutter reaches the fully armed position, it is locked by
the locking plate which moves outwards along its slot in the top face of the shutter to
engage in a recess in the shutter housing.
On impact or graze, the momentum of the striker holder overcomes the creep spring
and carries the striker needle forward to pierce the detonator. The resultant detonating wave
is transmitted through the stemmed tetryl in the magazine channel to the tetryl pellet in the
magazine and thence to the bunting charge in the shell.
(C) Application (Ammunition and Weapons)
Ammunition
Weapons
HESH projectiles, Models L2A2 and L2A3
120-mm tank gun, Model Ll
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Original
CREEP SPRING
STRIKER
BODY
GAUGING HOLE
SCREW
C E. PELLET
PAPER DISK
STEMMED C E
MAGAZINE CAP
4
CLOSING DISK
LOCKING RING
MAGAZINE
DELAYED ARMING
SHUTTER?
COVER
WASHER
SEGMENT--
SPRING"
SEGMENT
HOLDER
AST-1160H101-15
Fuze, BD, Model L19A1
FOM No. 1390-35-1-26
49W'
- 2.1r DIAM DIAM
(12 UNS Threads per inch 2A LHV
DELAYED ARMING SHUTTER
SHUTTER
LOCKING PLATE
WASHER
PALLET
ALIGNMENT SCREW
DETONATOR
SEGMENT
SAFETY PLUNGER
ESCAPE WHEEL
AND PINION
Neg. 552503 (CONFIDENTIAL)
Figure 4-16. Fuze, BD, Model L19A1, exploded, section,
and contour views (U).
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CONFIDENTIAL
AST-1160H-001-75 Original
Fuze, BD, Model Ll 9A1
FOM No. 1390-35-1-26
(C) Description
The L19A1 BD fuze (fig 4-16) was designed for use with HESH projectiles. It is a
delayed-arming, graze-sensitive type that functions on impact with the target. It is
considered bore safe by US standards. The fuze arms in about 0.02 to 0.06 second at
9000 rtmin.
(C) Unique Features
? Shutter housing out-of-line detonator.
? Escapement controlling the movement of the shutter.
? Spring-loaded plunger engaging locking plate.
(C) Characteristics
Fuze assembly:
Body material Anodized aluminum alloy
Weight 481 g (1.06 lb)
Markings Ll9A1
Length 4.90 in (124.50 mm)
Max diam 2.10 in (53.55 mm)
Thread diam 1.80 in (45.70 mm)
TPI 12
Booster:
Body material Anodized aluminum alloy
Body length 45.7 mm
Explosive Tetryl
Explosive weight 63.8 g (0.14 lb)
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Original AST-BODO-001-75
Fuze, BD, Model L19A1
FOM No. 1390-35-1-26
(C) Characteristics (Continued)
Functional data:
Arming method Setback & centrifugal force
Firing method Impact
Safety devices
Arming distance
Arming time 0.02 to 0.06 s
(C) Design Details
The L19A1 fuze (fig 4-16) incorporates a delayed-arming shutter and a striker-locking
assembly. It consists principally of a body, magazine and cap, striker assembly, creep spring,
striker locking segment, locking ring, and delayed-arming shutter No. 3 series containing a
2.8-gr (0.18-gram) "AZ" detonator.
Body. The body is made of anodized aluminum alloy. It is cylindrical in shape with a
wide flange formed at the base, above which it is externally threaded to 1.80-inch
(45.7-mm) diameter (12 UNS TPI-2A left hand) gage for approximately a quarter of its
length; the remainder of the body is left unthreaded. A hole is drilled in the center of the
base and threaded to accept a tracer-adapter. Two key holes, diagonally opposite, are also
formed in the base to enable the fuze to be inserted or removed from the shell. Internally,
the body is bored from the top in four diameters, the smaller at the base to accommodate
the striker and creep spring, the second and third, which are slightly larger in diameter,
accommodate the striker-locking segment, while the fourth and largest is screw-threaded at
the mouth. This larger recess accommodates the delayed-arming shutter, above which the
base portion of the magazine is screwed home. The base and flange of the body are coated
with varnish after the marking has been stamped on. Two threaded holes are formed in the
body: the lower is for the alignment screw for the delayed-arming shutter, and the upper is
for shutter gaging.
Striker. The striker consists of a brass electrotinned, cylindrical body, with a flange at
the base. Above the flange it is formed on three decreasing diameters, a recess being formed
in the top of the smallest diameter for the electroplated tin- or zinc-coated steel needle
(firing pin), the stem of which protrudes through the center of the striker-locking segment.
*Safety plunger, locking plate, and out-of-line detonator.
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CONFIDENTIAL
AST-116011-001-75 Original
Fuze, BD, Model L19A1
FOM No. 1390-35-1-26
(C) Design Details (Continued)
The needle, the base of which is flanged, is retained in the recess in the top of the body by a
tin-coated brass washer, which is secured by spinning over a lip at the top of the recess. The
needle is free to move sideways in its recess.
The striker is inserted into the cavity in the base of the fuze body together with the
creep spring, which is assembled around the larger diameter of the striker body, the bottom
cod resting on the flange. The creep spring is retained under initial compression by the top
coil seating in a recess and bearing against the base of the striker-locking segment assembly.
Creep spring. The creep spring is a cylindrical-coiled, tinned, steel-wire spring, with
five effective coils of 0.048-in (12.2-mm) diameter (18 SWG) (16 AWG) wire, one coil at
each end being close coiled and ground square with the axis of the spring. It is assembled
around the larger diameter of the striker body and prevents the assembled striker from
creeping forward when the shell is in flight.
Striker-locking segment assembly. This is assembled in the fuze body, the lower
portion fitting over the top of the striker. It is retained in position by the delayed-arming
shutter and the magazine. The striker-locking segment assembly comprises a holder, two
electrotin-plated steel pins, two springs, two segments, a washer, and a cover.
Segment holder. The cylindrical segment holder is made of aluminum alloy. Externally
it is formed in two diameters, the larger being at the top. The bottom portion of the larger
diameter is chamfered to blend with the smaller. The bottom of the smaller diameter is also
chamfered. Internally, from the base it is bored out in two diameters, while a recess is
formed in the top face to house the two locking segments, leaving a platform of metal
between the top and bottom. A hole is drilled through the center of the platform to permit
the striker to pass through. In the base of this recess, near the periphery, two holes,
diametrically opposite, are drilled to accept the steel pivot pins over which are assembled
the coiled torsion springs and the segments, this assembly being contained by the washer
and cover. When assembled, the tops of the two pins protrude above the top surface of the
holder.
Segments. The segments are made of aluminum alloy, and are perfectly flat, irregular,
arc-shaped fitments. One end is in the form of a toe, which is machined to act as a working
surface when the two segments are assembled in the unarmed or locked position. The other
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Original AST-116011-001-75
Fuze, BD, Model L19A1
FOM No. 1390-354-26
(C) Design Details (Continued)
end is wider and acts as a weight which, under the influence of centrifugal force, overcomes
the springs and allows the two segments to open 'out. Two holes are drilled near the toe, the
larger to fit over the pin on which the segment pivots, the smaller accommodating the
turned up end of the segment spring. In the closed or unarmed position, the top portion of
the striker bears against the underside of the closed segments; the striker is thereby
prevented from moving forward until the segments are opened by centrifugal force, while
the needle of the striker assembly protrudes through the hole formed by the two
semicircular slots, one in each segment, through the washer and cover and into the pivot
tube of the shutter delayed arming.
Segment spring. The segment springs are made of 0.024 (23 SWG) (22 AWG) tinned
steel wire, with 5.2 close-wound coils, the ends of the wire are bent up at right angles to the
coils. These are assembled over the pivot pins and underneath the segments, the lower end
of the spring fitting into a small hole drilled in the holder adjacent to the pin, while the
upper end of the spring is located in a small hole drilled in the segment.
Washer. Made of anodized aluminum alloy, the washer is in the form of a flat disk
with a hole formed in the center and two slots, diametrically opposite, near the periphery. It
is assembled on top of the holder, the protruding ends of the pivot pins being located in the
slots and the point of the striker needle protruding through the central hole.
Cover. The cover is made of aluminum alloy, formed with a large hole in the center. It
fits over the top of the holder and retains the washer in position above the segments. It is
secured in position by spinning or pressing the bottom edge over and around the external
chamfer of the larger diameter portion of the segment holder.
Locking ring. The locking ring is made of anodized aluminum alloy. It is cylindrical in
shape, formed plain on the outside, and screw-threaded internally. Two slots, diametrically
opposed, are cut across the mouth to facilitate assembly. It is screwed onto the upper part
of the magazine, locking against the top of the body.
Delayed-arming shutter No. 3 series. (See sec VIII) This consists of four main
components, the body, the escapement, a safety plunger with spring, and a shutter
containing a 2.8-gr (0.18 gram) "AZ" lugless (tinned copper alloy cup) detonator assembled
in a circular-shaped shutter body, over which fits a cover plate. The shutter is held in the
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CONFIDENTIAL
AST-1160H-001-75 Original
Fuze, BD, Model L19A1
FOM No. 1390-35-1-26
(C) Design Details (Continued)
unarmed position by means of the spring-loaded aluminum-alloy safety plunger which
engages in one end of a locking plate. The safety plunger is retained in a recess in the side of
the shutter body by a plunger retaining strip. On spin, the safety plunger overcomes its
spring and disengages from the recess in the end of the locking plate by centrifugal force.
The lead-weighted shutter rotates until the detonator is in a central position over the striker
hole. The plunger retaining strip, which engages in a slot cut in the side of the plunger,
retains the plunger in its recess in the shutter body. The locking plate, which fits into a slot
made across the face of the shutter, moves out and engages in a recess made in the outer side
of the shutter body, thus locking the shutter in the armed position. The delay is obtained by
means of a pallet-and-pinion mechanism positioned beneath the shutter that oscillates a
segment by means of a 'scapc wheel and pinion which retard the opening of the shutter. The
shutter commences to open when the shell is spinning between 7000 and 8500 r/min. The
time of ,opening is between 0.020 and 0.055 second when the shell is spinning at
8000 di-inn.
The closed (lower) face of the delayed-arming shutter rests on the segment holder.
When the magazine is screwed home, it clamps both the delayed-arming shutter and segment
holder in position, with the creep spring located between the striker flange and the face of
the large recess in the holder. The correct position of the delayed-arming shutter is
controlled by the engagement of a screw with the vertical slot in the body. The fuze body
and the delayed-arming shutter body are provided with safety Inspection holes which are in
alignment in the assembled fuze, and through which the "SAFE" position of the shutter is
verified at the filling stage. After inspection the hole is closed by a screw. The threads of this
screw are coated with cement and the thread is staked after screwing home; the slotted end
of the screw is then coated with cement.
Magazine (i.e., booster). The magazine is made of anodized aluminum alloy. It is
cup-shaped and externally threaded except for an undercut at each end. Two key slots are
formed in the outer rim to facilitate assembly. Internally, the magazine is bored out to take
a prepressed pellet of CE (tetryl) and a small recess, which is filled with loose CE stemmed
in, is drilled in the center at the bottom, leaving a thin diaphragm of metal between the
recess and the outer surface at the base of the magazine. The magazine is screwed into the
open end of the fuze body, the base of the magazine resting on the delayed-arming shutter.
The outer end of the magazine protrudes above the body of the fuze; it is locked into the
body by the locking ring and is closed by the magazine cap.
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Original AST-1160H-001-75
Fuze, BD, Model L19A1
FOM No. 1390-35-1-26
(C) Design Details (Continued)
Magazine cap. The magazine cap is made of anodized aluminum alloy. It is cup-shaped
with an internal thread to screw over the magazine; the threads are coated with RD 1286
prior to assembly. A box-cloth disk is attached to the inner surface by shellac adhesive. It is
then secured by crimping the outer rim in three or more equi-spaced positions.
(C) Safety
Safety is provided as follows:
? The rotating delayed-arming shutter is retained in the safe or unarmed
position by the spring-loaded safety plunger, which engages in the safety
locking plate. This provides bore and muzzle safety to cover a specified
minimum distance from the gun when arming commences.
? When the shutter is in the unarmed position, its detonator is screened off
from the striker and from the stemmed CE channel leading to the CE
pellet in the body of the magazine.
? The shutter is designed to provide a slight delay before it reaches the
armed position; the approximate time of operation is 0.02 to
0.055 second at 9000 r/min.
? The striker locking segments prevent the striker from moving forward
before firing and hold the striker in the "SAFE" position in transit,
handling and loading.
? The creep spring keeps the striker from moving forward during flight due
to deceleration after leaving the muzzle.
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AST-1160H-001-75
Fuze, BD, Model L19A1
FOM No. 1390-35-1-26
(C) Functioning (Fig 4-17)
FUZE UNARMED WITH DELAYED
ARMING SHUTTER SEGMENTS AND
STRIKER HELD IN SAFE POSITION
BEFORE FIRING
LEAD WEIGHT
LOCKING
PLATE
DETONATOR
SAFETY PLUNGER
SHUTTER LOCKED IN THE
UNARMED POSITION
COVER AND WASHER REMOVED
FOR ILLUSTRATIVE PURPOSES
net
DURING FLIGHT
SEGMENTS HELD OPEN AND STRIKER
IN FIRED POSITION
ON IMPACT
SHUTTER RELEASED AND ROTATING
TOWARDS THE ARMCO POSITION
SHUTTER LOCKED IN THE FULLY
ARMED POSITION
(CONFIDENTIAL)
Figure 4-17. Fuze, BD, Model L19A1, functioning views (U).
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Original AST-1160H-001-75
Fuze, OD, Model L19A1
FOM No. 1390-35-1-26
(C) Functioning (Continued)
On firing, the shutter, striker-locking segments, and striker setback are retained in the
unarmed position by friction.
During flight, the segments in the striker-locking assembly move outward against their
springs, leaving a clear passage for the striker to move forward. The safety plunger
overcomes its spring and moves outward to release the shutter. The shutter begins to rotate
until its detonator reaches a central position directly in alignment with the striker needle
and the stemmed CE (tetryl) channel leading to the magazine. The delay is obtained by
means of a pallet and escape wheel mechanism positioned beneath the shutter. The escape
wheel is fitted with a pinion which is in mesh with a segment on the side of the shutter. The
pallet acts as a pendulum and engages successive teeth in the escape wheel to retard the
rotary movement of the shutter. When the shutter reaches the fully armed position, it is
locked by the locking plate which moves outward along its slot on the face of the shutter to
engage in a recess in the shutter housing.
On impact or graze, the momentum of the striker holder overcomes the creep spring
and carries the striker needle forward to pierce the detonator. The resultant detonating wave
is transmitted through the stemmed CE pellet in the magazine and thence to the bursting
charge in the shell.
(C) Summary of Differences
? Model Al fuze (obsolescent). The Model Al is fitted with delayed-arming
shutter No. 3.
? Model A2 fuze (obsolescent). The Model A2 is fitted with delayed-arming
shutter No. 3A, which differs from the No. 3 in that it incorporates a
redesigned cover plate (QX 75 SA in lieu of QX 573).
? Model A3 fuze (obsolescent). The Model A3 is fitted with delayed-arming
shutter No. 3B, which is similar to the No. 3A shutter except that it
incorporates certain components manufactured from corrosive-resistive
stainless steel in lieu of steel.
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AST-1150H-001-75
Fuze, BD, Model L19A1
FOM No. 1390-35-1-26
(C)
Summary of Differences (Continued)
? Model A4 fuze. This model is fitted with delayed-arming shutter No. 3C,
3C/1, or 3C/2. All of these shutters differ from the No. 3, 3A, and 3B in
that they incorporate a 2.6-gr (0.17-gram) "LZ" detonator in lieu of a
2.8-gr (0.18-gram) "AZ" detonator.
In addition, the shutters differ in the following way:
? No. 3C ? same body as No. 3B, i.e., die cast.
? No. 3C/1 ? body machined from bar, it also incorporates a shutter gaging
hole of increased diameter.
? No. 3C/2 ? body die cast but incorporating a shutter gaging hole of
increased diameter.
C) Applications (Ammunition and Weapons)
Original
Ammunition
Weapons
105-mm HESH projectiles, Models
L35A1 and L37
120-mm HESH projectiles
105-mm tank gun, Models L18A3
and L20A1
120-mm BAT gun and tank gun
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Original
C. E. PELLET
? PAPER DISK
--STEMMED C. E.
CLOSING DISK
LOCKING RING
MAGAZINE --
DELAYED ARMING
SHUTTER
COVER
WASHER
SEGMENT
SPRING (TORSION)
SEGMENT HOLDER
CREEP SPRING-
STRIKER
BOGY
GAUGING HOLE
SCREW
AST-1160H-001-75
Fuze, BD, Model L24A1
FOM No. 1390-35-1-27
4.90"
2.10"DIAM - 00"DIAM -
(12 UNS Threads per inch 2A LH)
DELAYED ARMING SHUTTER
- -DETONATOR
- SEGMENT
SAFETY PLUNGER
ESCAPE WHEEL
AND PINION
SHUTTER ?
LOCKING PLATE
WASHER - -
PALLET
ALIGNMENT SCREW
N eg. 552504 (CONFIDENTIAL)
Figure 4-18. Fuze, BD, Model L24A1, exploded, section,
and contour views (U).
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AST-1160H-001-75 Original
Fuze, BD, Model L24A1
FOM No. 1390-354-27
(C) Description
The L24A1 (fig 4-18) is a delayed-arming, graze-sensitive, BD fuze designed for the
L33A1 165-mm HESH projectile. It is considered bore safe by US standards.
(C) Unique Features
? Shutter housing out-of-line detonator.
? Escapement controlling movement of shutter.
? Spring-loaded safety plunger engaging a safety locking plate.
(C) Characteristics
Fuze assembly:
Body material Anodized aluminum alloy
Weight 504 g (1.10 lb)
Markings L24A1
Length 4.40 in (111.76 mm)
Max diam 2.10 in (53.43 mm)
Thread diam 1.80 in (45.72 mm)
TPI 12
Booster:
Body material Anodized aluminum body
Body length 7
Explosive Tetryl
Explosive weight 70.8 g (0.16 lb)
Functional data:
Arming method Setback and centrifugal force
Firing method Impact
Safety devices
Arming distance
Arming time 0.05 to 0.08 $
'Safet-y plunger, locking plate, and out-of-line detonator.
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Original AST-1160H-001-75
Fuze, BD, Model L24A1
FOM No. 1390-35-1-27
(C) Design Details
General. The L24A1 fuze (fig 4-18) incorporates a delayed-arming, shutter-locking
assembly. It consists principally of a body, magazine and cap, striker assembly, creep spring,
striker-locking segment, locking ring, and delayed-arming shutter No. 4 series containing a
0.18-gram (2.80-gr) "AZ" detonator.
Note: The L24 fuze differs from the L19 fuze in only two features:
? Striker-locking segment assembly is fitted with weaker torsion springs
than those used in the L19 fuze.
? Delayed-arming shutter No. 4 is designed to arm at a lower rate of spin; a
stainless steel safety plunger and a weaker plunger spring than that used in
the delayed-arming shutter No. 3 is used.
Body. The body is made of anodized aluminum alloy. It is cylindrical in shape with a
wide flange formed at the base, above which it is screw-threaded externally to 1.80-inch
(45.72-mm) diameter (12 UNS TPI-2A left hand) gage for approximately a quarter of its
length; the remainder of the body is left plain. A hole is drilled in the center of the base and
screw-threaded to accept a tracer-adapter. Two holes, diagonally opposite, are also formed
in the base to enable the fuze to be inserted or removed from the shell. Internally, the body
is bored from the top in four diameters, the smaller at the base to accommodate the striker
and creep spring, the second and third, which are slightly larger in diameter, accommodate
the striker-locking segment, while the fourth and largest is screw-threaded at the mouth.
This larger recess accommodates the delayed-arming shutter, above which the base portion
of the magazine is screwed home. The base and flange of the body are coated with varnish
after the marking has been stamped on. Two screw-threaded holes are formed in the body:
the lower is for the delayed-arming shutter-alignment screw, and the upper for shutter
gaging.
Striker. The striker consists of a brass electrotinned cylindrical body with a flange at
the base, above which it is formed on three decreasing diameters. A recess is formed in the
top of the smallest diameter for the electroplated tin- or zinc-coated steel needle, the stem
of which protrudes through the center of the striker locking segment. The needle, the base
of which is flanged, is retained in the recess in the top of the body by a tin-coated brass
washer secured by spinning over a lip at the top of the recess. The needle is free to move
sideways in its recess.
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AST-1160H-001-75 Original
Fuze, BD, Model L24A1
FOM No. 1390-35-1-27
(C) Design Details (Continued)
The striker is inserted into the cavity in the base of the fuze body together with the
creep spring, which is assembled around the larger diameter of the striker body, the bottom
coil resting on the flange. The creep spring is retained under initial compression by seating
the top coil in a recess and bearing it against the base of the striker-locking segment
assembly.
Creep spring. The creep spring is a cylindrical-coiled, tinned, steel-wire spring, with
five effective coils of 0.048-inch (1.22-mm) (18 SWG) diameter wire, one coil at each end
being close coiled and ground square with the axis of the spring. It is assembled around the
larger diameter of the striker body and prevents the assembled striker from creeping forward
when the shell is in flight.
Striker-locking segment assembly. This is assembled in the fuze body, the lower
portion fitting over the top of the striker. It is retained in position by the delayed-arming
shutter and the magazine. The striker-locking segment assembly comprises a holder, two
electrotin-plated steel pins, two springs, two segments, a washer, and a cover.
Segment holder. The cylindrical segment holder is made of aluminum alloy. Externally
it is formed in two diameters, the larger being at the top. The bottom portion of the larger
diameter is chamfered to blend with the smaller. The bottom of the smaller diameter is also
chamfered. From the base it is bored out internally in two diameters, while a recess is
formed in the top face to house the two locking segments, leaving a platform of metal
between the top and bottom. A hole is drilled through the center of the platform to permit
the striker to pass through. In the base of this recess near the periphery, two holes,
diametrically opposite, are drilled to accept the steel pivot pins, over which are assembled
the coiled torsion springs and the segments. This assembly is contained by the washer and
cover, and when assembled, the tops of the two pins protrude above the top surface of the
holder.
Segments. The segments are made of aluminum alloy, and are perfectly flat, irregularly
shaped pieces. One end is in the form of a toe, which is machined to act as a working surface
when the two segments are assembled in the unarmed or locked position. The other end is
wider and acts as a weight which, under the influence of centrifugal force, overcomes the
springs and allows the two segments to open out. Two holes are drilled near the toe, the
larger fitting over the pin on which the segment pivots, the smaller accommodating the
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CONFIDENTIAL
Original AST-116011-001-75
Fuze, BD, Model L24A1
FOM No. 1390-35-1-27
(C) Design Details (Continued)
turned-up end of the segment spring. In the closed or unarmed position, the top portion of
the striker bears against the underside of the closed segments; the striker is thus prevented
from moving forward until the segments are opened by centrifugal force. The needle of the
striker assembly protrudes through the hole formed by the two semicircular slots, one in
each segment, through the washer, and into the pivot tube of the delayed-arming shutter.
Segment spring. The segment springs are made of 0.18-inch (0.45-mm) (26 SWG)
diameter tinned steel wire, with 6.1 close-wound coils, the ends of the wire being bent up at
right angles to the coils. The springs are assembled over the pivot pins and underneath the
segments. The lower end of the spring fits into a small hole drilled in the holder adjacent to
the pin, while the upper end is located in a small hole drilled in the segment.
Washer. The washer is made of anodized aluminum alloy in the form of a flat disk
with a hole formed in the center and two slots, diametrically opposite, near the periphery. It
is assembled atop the holder, the protruding ends of the pivot pins being located in the slots
and the point of the striker needle protruding through the central hole.
Cover. The cover is made of aluminum alloy, formed with a larger hole in the center.
It fits over the top of the holder and retains the washer in position above the segments. It is
secured in position by spinning or pressing the bottom edge over around the external
chamfer of the larger diameter portion of the segment holder.
Locking ring. The locking ring is made of anodized aluminum alloy. It is cylindrical in
shape, formed plain on the outside, and internally threaded. Two slots, diametrically
opposed, are cut across the mouth to facilitate assembly. It is screwed onto the upper part
of the magazine, locking against the top of the body.
Delayed-arming shutter No. 4 series. This consists of four main components: the body,
the escapement, a safety plunger with spring, and a shutter containing a 0.18-gram (2.80-gr)
"AZ" lugless (tinned copper alloy cup) detonator assembled in a circular-shaped shutter
body over which fits a cover plate. The shutter is held in the unarmed position by means of
the spring-loaded, stainless-steel, safety plunger, which engages in one end of a locking plate.
The safety plunger is retained in a recess in the side of the shutter body by a plunger
retaining strip. On spin, the safety plunger overcomes its spring and disengages from the
recess in the end of the locking plate by centrifugal force, and the lead-weighted shutter
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AST-1160H-001-75 Original
Fuze, BD, Model L24A1
FOM No. 1390-35-1-27
(C) Design Details (Continued)
rotates until the detonator is in a central position over the striker hole. The plunger
retaining strip, which engages in a slot cut in the side of the plunger, retains the plunger in
its recess in the shutter body. The locking plate, fits into a slot made across the face of the
shutter, moves out, and engages in a recess made in the outer side of the shutter body, thus
locking the shutter in the armed position. The delay is obtained by means of a
pallet-and-pinion mechanism positioned beneath the shutter; this oscillates a segment by
means of a 'scape wheel and pinion which retard the opening of the shutter. The shutter
commences to open when the projectile is spinning between 3700 and 4500 r/min. The time
of opening is between 0.045 and 0.075 second when the shell is spinning at 5900 r/min.
The closed (lower) face of the delayed-arming shutter rests on the segment holder.
When the magazine is screwed home, it clamps both the delayed-arming shutter and segment
holder in position, with the creep spring located between the striker flange and the face of
the larger recess in the holder. The correct position of the delayed-arming shutter is
controlled by the engagement of a screw with the vertical slot in the body. The fuze body
and the delayed-arming shutter body are provided with safety gaging holes aligned in the
assembled fuze and through which the "SAFE" position of the shutter is gaged at the filling
stage. After gaging, the hole is closed by a screw. The threads of this screw are coated with
cement; the thread is stabbed after assembly, and the slotted end of the screw is then coated
with cement.
Magazine (i.e., booster). The magazine is made of anodized aluminum alloy; it is
cup-shaped and externally threaded except for an undercut at each end. Two key slots are
formed in the outer rim to facilitate assembly. Internally, the magazine is bored out to take
a prepressed pellet of tetryl and a small recess, which is filled with loose tetryl, is drilled in
the center at the bottom, leaving a thin diaphragm of metal between the recess and the
outer surface at the base of the magazine. The magazine is screwed into the open end of the
fuze body, the base of the magazine resting on the delayed-arming shutter. The outer end of
the magazine protrudes above the body of the fuze; it is locked into the body by the locking
ring and is closed by the magazine cap.
Magazine cap. The magazine cap is made of anodized aluminum alloy. It is cup-shaped
with an internal thread to screw over the mouth of the magazine; the threads are coated
with RD 1286 prior to assembly. A box-cloth disk is attached to the inner surface by shellac
adhesive. It is then secured by the outer rim and crimped at three or more equidistant
points.
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Original AST-1160H-001-75
Fuze, BD, Model L24A1
FOM No. 1390-354-27
(C) Safety
Safety is provided as follows:
? The rotating delayed-arming shutter is retained in the safe or unarmed
position by the spring-loaded safety plunger, which engages in the safety
locking plate. This provides bore and muzzle safety to cover a specified
minimum distance from the gun when arming commences.
? When the shutter is in the unarmed position, its detonator is screened off
from the striker and from the tetryl-filled channel leading to the CE
(tetryl) pellet in the body of the magazine.
? The shutter is designed to provide a slight delay before it reaches the
armed position. The approximate time of operation is 0.045 to
0.075 second at 5900 r/min.
? The striker locking segments prevent the striker from moving forward
before firing and hold the striker in the "SAFE" position in transit,
handling, and loading.
? The creep spring prevents the tendency of the striker to move forward
during flight due to deceleration after leaving the muzzle.
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AST-1160H-001-75
Fuze, BD, Model L24A1
FOM No. 1390-35-1-27
(C) Functioning (Fig 4-19)
_n.
FUZE FUZE UNARMED WITH DELAYED
ARMING SHUTTER SEGMENTS AND
STRIKER NEW IN SAFE POSITION
BEFORE FIRING
LEAD WEIGHT
LOCKING PLATE
DETONATOR
SAFETY PLUNGER
SHUTTER LOCKED IN THE
UNARMED POSITION
COVER AND WASHER REMOVED
FOR ILLUSTRATIVE PURPOSES
- tin teti
SEGMENTS HELD OPEN AND STRIKER
IN FIRED POSITION
DURING FLIGHT
ON IMPACT
SHUTTER RELEASED AND ROTATING
TOWARDS THE ARMED POSITION
SHUTTER LOCKED IN THE FULLY
ARMED POSITION
(CONFIDENTIAL)
Figure 4-19. Fuze, BD, Model L24A1, functioning views (U).
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Original AST-1160H-001-75
Fuze, BD, Model L24A1
FOM No. 1390-35-1-27
(C) Functioning (Continued)
On firing, the shutter, striker-locking segments, and striker setback are retained in the
unarmed position by friction.
During flight, the segments in the striker-locking assembly move outward against their
springs, leaving a clear passage for the striker to move forward. The safety plunger
overcomes its spring and moves outward to release the shutter. The plunger retaining strip,
which engages in a slot cut in the side of the plunger, retains the latter and prevents it from
leaving its recess in the shutter housing when the plunger spring reasserts itself. The shutter
begins to rotate until its detonator reaches a central position directly in alignment with the
striker needle and the stemmed CE (tetryl) channel leading to the magazine. The delay is
obtained by means of a pallet and escape wheel mechanism positioned beneath the shutter.
The escape wheel is fitted with a pinion which is in mesh with a segment on the side of the
shutter. The pallet acts as a pendulum and engages successive teeth in the escape wheel to
retard the rotary movement of the shutter. When the shutter reaches the fully armed
position, it is locked by the locking plate, which moves outward along its slot in the top face
of the shutter to engage in a recess in the shutter housing.
On impact or graze, the momentum of the striker holder overcomes the creep spring
and carries the striker needle forward to pierce the detonator. The resultant detonating wave
is transmitted through the stemmed CE (tetryl) in the magazine channel to the CE pellet in
the magazine and thence to the bunting charge in the shell.
(C) Summary of Differences
? Model Al fuze (obsolescent). The Model Al is fitted with delayed-arming
shutter No. 4.
? Model A2 fuze. This model is fitted with delayed-arming shutter No. 4A
or 4A/1.
Both of these shutters differ from the No. 4 in that they incorporate a 2.6-gr
(0.17 gram) "LZ" detonator in lieu of a 2.8-gr (0.18 gram) "AZ" detonator. In addition, the
shutters differ in the following way:
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CONFIDENTIAL
AST-116011-001-75 Original
Fuze, BD, Model L24A1
FOM No. 1390-35-1-27
(C) Summary of Differences (Continued)
? No. 4A?die cast body as for No. 4, but with larger diameter
shutter-gaging hole.
? No. 4A/1?machined from bar, it also incorporates a larger diameter
shutter gaging hole than the No. 4 shutter.
(C) Application (Ammunition and Weapons)
Ammunition
Weapons
HESH projectile, Model L33A1
165-mm gun, AVRE, Model L9A1
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Original
C E. PELLETS
. PAPER DISK
- STEMMED C. E.
CLOSING DISK----
LOCKING RING .
MAGAZINE
DELAYED ARMING
SHUTTER
COVER
WASHER
SEGMENTS ----as.
SPRINGS (TORSION)
AST-116 0 H-001 -75
Fuze, BD, Model L29A1
FOM No. 1390-35-1-28
SEGMENT HOLDER ---
CREEP SPRING --
STRIKER
BODY
410"
ALIGNMENT SCREW
2.30?DIAM
(12 UNS Threads per tath 2 ALH)
DELAYED ARMING SHUTTER
SHUTTER ---- --erne^
DETONATOR -
SEGMENT
PALLET
LOCKING PLATE
SAFETY PLUNGER
ESCAPE WHEEL
AND PINION
Neg. 552505 (CONFIDENTIAL)
Figure 4-20. Fuze, BD, Model L29A1, exploded, section,
and contour views (U).
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CONFIDENTIAL
AST-1160H-001-75 Original
Fuze, OD, Model L29A1
FOM No. 1390-35-1-28
(C) Description
The L29A1 (fig 4-20) is a delayed-arming, graze-sensitive, BD fine designed to function
upon impact with the target. It is intended for use with HESH projectiles fired from tank
guns or howitzers. The delayed-arming shutter employed provides a slight delay of 0.02 to
0.55 second at 9000 r/min.
(C) Unique Features (if applicable)
? Shutter housing out-of-line detonator.
? Escapement controlling movement of shutter.
? Spring-loaded plunger engaging locking plate of the shutter provides bore
safety and muzzle safety.
(C) Characteristics
Fuze assembly:
Body material Anodized aluminum alloy
Weight 654 g (1.44 lb)
Markings L29A1
Length 4.90 in (124.5 mm)
Major diam 2.30 in (58.8 mm)
TPI 12
Booster:
Body material Anodized aluminum alloy
Body length 48.3 mm (1.90 in)
Explosive Tetryl
Explosive weight 71 g (0.16 lb)
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CONFIDENTIAL
Original AST-1160H-001-75
Fuze, BD, Model L29A1
FOM No. 1390-35-1-28
(C) Characteristics (Continued)
Functional data:
Arming method Setback & centrifugal force
Firing method Impact
Safety devices
Arming distance
Arming time 0.02 to 0.06 s
(C) Design Details
General. The L29A1 BD fuze (fig 4-20) incorporates a delayed-arming shutter and a
striker-locking assembly. It consists principally of a body, magazine and cap, striker
assembly, creep spring, striker-locking segment, locking ring, and delayed-arming shutter
No. 3 series containing a 2.8 gr (0.18 gram) "AZ" detonator.
Body. The body is made of anodized aluminum alloy and is cylindrical in shape with a
wide flange formed at the base. It is externally threaded to 2.0-inch (50.8-mm) diameter
(12 UNS TPI-2A left hand) gage for approximately a quarter of its length from the top; the
remainder of the body is left plain. A hole is drilled in the center of the base and threaded
to accept a tracer-adapter. Two holes, diagonally opposite, are also formed in the base to
enable the fuze to be inserted or removed from the shell. Internally, the body is bored from
the top in four diameters. The smaller, at the base, accommodates the striker and creep
spring; the second and third, which are slightly larger in diameter, accommodate the
striker-locking segment; while the fourth and largest is screw threaded at the mouth. This
larger recess accommodates the delayed-arming shutter, above which the base portion of the
magazine is assembled. The base and flange of the body are coated with varnish after the
marking has been stamped on. Two threaded holes are formed in the body: the lower for
the delayed-arming shutter alignment screw and the upper for shutter gaging.
Striker. The striker consists of a cylindrical, tinned, brass body. Above the flange at
the base, it is formed on three decreasing diameters; a recess is formed in the top of the
smallest diameter for the tin- or zinc-coated steel needle, the stem of which protrudes
through the center of the striker-locking segment.
*Safety plunger, safety locking plate, out-of-line detonator.
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AST-1160H-001-75 Original
Fuze, BD, Model L29A1
FOM No. 1390-35-1-28
(C) Design Details (Continued)
The needle, the base of which is flanged, is retained in the recess in the top of the body
by a tin-coated, brass washer which is secured by spinning over a lip at the top of the recess.
The needle is free to move sideways in its recess.
The striker is inserted into the cavity in the base of the fuze body together with the
creep spring, which is assembled around the larger diameter of the striker body, the bottom
coil resting on the flange. The creep spring is retained under initial compression by seating
the top coil in a recess and bearing it against the base of the striker-locking segment
assembly.
Creep spring. The creep spring is a cylindrical-coiled, tinned, steel-wire spring, with
five effective coils of 0.048-in (1.2-mm) diameter (18 SWG) (16 AWG) wire, one coil at each
end being close coiled and ground square with the axis of the spring. It is assembled around
the larger diameter of the striker body and prevents the assembled striker from creeping
forward when the shell is in flight.
Striker-locking segment assembly. This is assembled in the fuze body, the lower
portion fitting over the top of the striker. It is retained in position by the delayed-arming
shutter and the magazine. The striker-locking segment assembly comprises a holder, two
electrotin-plated steel pins, two springs, two segments, a washer, and a cover.
Segment holder. The cylindrical segment holder is made of aluminum alloy. Externally
it is formed in two diameters, the larger being at the top. The bottom portion of the larger
diameter is chamfered to blend with the smaller. The bottom of the smaller diameter is also
chamfered. Internally, from the base it is bored out in two diameters, while a recess is
formed in the top face to house the two locking segments, leaving a platform of metal
between the top and bottom. A hole is drilled through the center of the platform to permit
the striker to pass through. In the base of this recess near the periphery two holes,
diametrically opposite, are drilled to accept the steel pivot pins, over which are assembled
the coiled torsion springs and the segments. This assembly is contained by the washer and
cover, and when assembled, the tops of the two pins protrude above the top surface of the
holder.
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Original AST-1160H-001-75
Fuze, BD, Model L29A1
FOM No. 1390-35-1-28
(C) Design Details (Continued)
Segments. The segments, made of aluminum alloy, are flat, irregular, arc-shaped
fitments. One end is in the form of a toe machined to act as a working surface when the two
segments are assembled in the unarmed or locked position; the other end is wider and acts as
a weight which, under the influence of centrifugal force, overcomes the springs and allows
the two segments to open out. Two holes are drilled near the toe, the larger fitting over the
pin on which the segment pivots, the smaller accommodating the turned up end of the
segment spring. In the closed or unarmed position the top portion of the striker bears
against the underside of the closed segments, thus preventing the striker from moving
forward until the segments are opened by centrifugal force. The needle of the striker
assembly protrudes through the hole formed by the two semicircular slots, one in each
segment, through the washer and cover, and into the pivot tube of the delayed arming
shutter.
Segment spring. The segment springs are made of 0.024-inch (0.61-mm) diameter
(23 SWG) tinned steel wire, with a 5.2 close-wound coils; the ends of the wire are bent up at
right angles to the coils. The springs are assembled over the pivot pins and underneath the
segments, the lower end of the spring fitting into a small hole drilled in the holder adjacent
to the pin, while the upper end is located in a small hole drilled in the segment.
Washer. Made of anodized aluminum alloy, the washer is a flat disk with a hole formed
in the center and two slots, diametrically opposite, near the periphery. It is assembled on
top of the holder, the protruding ends of the pivot pins being located in the slots, and the
point of the striker needle protruding through the central hole.
Cover. The cover is made of aluminum alloy, formed with a large hole in the center. It
fits over the top of the holder and retains the washer in position above the segments. It is
secured in position by spinning or pressing the bottom edge over the external chamfer of the
larger diameter portion of the segment holder.
Locking ring. The locking ring is made of anodized aluminum alloy. It is cylindrical in
shape, formed plain on the outside and screw-threaded inside. Two slots, diametrically
opposed, are cut across the mouth to facilitate assembly. It is screwed onto the upper part
of the magazine, locking against the top of the body.
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AST-1160H-001-75 Original
Fuze, BD, Model L29A1
FOM No. 1390-35-1-28
(C) Design Details (Continued)
Delayed-arming shutter No. 38. This consists of four main components: the body, the
escapement, a safety plunger with spring, and a shutter containing a 2.8-gr (0.18-gram)
"AZ" lugless (tinned copper alloy cup) detonator assembled in a circular-shaped shutter
body over which a cover plate fits. The shutter is held in the unarmed position by the
spring-loaded, aluminum-alloy, safety plunger which engages in one end of a locking plate.
The safety plunger is retained in a recess in the side of the shutter body by a plunger
retaining strip. On spin, the safety plunger overcomes its spring and disengages from the
recess in the end of the locking plate by centrifugal force; the lead-weighted, biased shutter
rotates until the detonator is in a central position over the striker hole. The plunger
retaining strip, which engages in a slot cut in the side of the plunger, retains the plunger in
its recess in the shutter body. The locking plate, which fits into a slot made across the face
of the shutter, moves out and engages in a recess made in the outer side of the shutter body,
thus locking the shutter in the armed position. The delay is obtained by means of a
pallet-and-pinion mechanism positioned beneath the shutter that oscillates a segment by
means of a 'scape wheel and pinion, retarding the opening of the shutter. The shutter
commences to open when the shell is spinning between 7000 and 8500 r/min. The time of
opening is between 0.02 and 0.055 second when the shell is spinning at 9000 r/min.
The closed (lower) face of the delayed-arming shutter rests on the segment holder.
When the magazine is screwed home, it clamps both the delayed-arming shutter and segment
holder in position, with the creep spring located between the striker flange and the face of
the larger recess in the holder. The correct position of the delayed-arming shutter is
controlled by the engagement of a screw with the vertical slot in the body. The fuze body
and the delayed-arming shutter body are provided with safety-gaging holes that are in
alignment in the assembled fuze and through which the "SAFE" position of the shutter is
gaged at the filling stage. After gaging, the hole is closed by a screw. The threads of this
screw are coated with cement; the thread is stabbed after assembly and the slotted end of
the screw is then coated with cement.
Magazine (i.e., booster). The magazine is made of anodized aluminum alloy. It is
cup-shaped and threaded externally except for an undercut at each end. Two slots are
formed in the outer rim to facilitate assembly. Internally, the magazine is bored out to take
a prepressed pellet of CE (tetryl) and a small recess, which is filled with loose CE pressed in,
is drilled in the center at the bottom, leaving a thin diaphragm of metal between the recess
and the outer surface at the base of the magazine. The magazine is screwed into the open
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Original AST-1160 H-001-75
Fuze, BD, Model L29A1
FOM No. 1390-35-1-28
(C) Design Details (Continued)
end of the fuze body, with the magazine base resting on the delayed-arming shutter. The
outer end of the magazine protrudes above the body of the fuze; it is locked into the body
by the locking ring and closed by the magazine cap.
Magazine cap. The cap is made of anodized aluminum alloy. It is cup-shaped and
internally threaded to screw over the mouth of the magazine. The threads are coated with
RD 1286 prior to assembly. It is then secured by crimping the outer rim in three or more
equi-spaced positions. A box-cloth disk is attached to the inner surface by shellac adhesive.
(C) Safety
Safety is provided as follows:
? The rotating delayed-arming shutter is retained in the safe or unarmed
position by the spring-loaded safety plunger, which engages in the safety
locking plate. This provides bore and muzzle safety to cover a specified
minimum distance from the gun when arming commences.
? When the shutter is in the unarmed position, its detonator is screened off
from the striker and from the stemmed CE (tetryl) channel leading to the
CE pellet in the body of the magazine.
? The shutter is designed to provide a slight delay before it reaches the
armed position. The approximate time of operation is 0.02 to
0.055 second at 9000 r/min.
? The striker locking segments prevent the striker from moving forward
before firing and hold the striker in the "SAFE" position in transit,
handling, and loading.
? The creep spring prevents the tendency of the striker to move forward
during flight due to deceleration after leaving the muzzle.
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AST-116014-001-75
Fuze, BD, Model L29A1
FOM No. 1390-35-1-28
(C) Functioning (Fig 4-21)
BEFORE FIRING
DURING FLIGHT
COVER AND WASHER REMOVED
FOR ILLUSTRATIVE PURPOSES
ON IMPACT
LEAD WEIGHT T
LOCKING k
PLATE
SAFETY PLUNGER
DETONATOR
SHUTTER LOCKED IN THE
UNARMED POSITION
SHUTTER RELEASED ANO ROTATING
TOWARDS THE ARMED POSITION
SHUTTER LOCKED IN THE FULLY
ARMED POSITION
(CONFIDENTIAL)
Figure 4-21. Fuze, BD, Model L29A1, functioning views (U).
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CONFIDENTIAL
Original AST-1160H-001-75
Fuze, BD, Model L29A1
FOM No. 1390-35-1-28
(C) Functioning (Continued)
On firing, the shutter, striker-locking segments, and striker setback are retained in the
unarmed position by friction.
During flight, the segments in the striker-locking assembly move outward against their
springs, leaving a clear passage for the strike' to move forward. The safety plunger
overcomes its spring and moves outward to release the shutter. The shutter rotates until its
detonator reaches a central position directly in alignment with the striker needle and the
stemmed CE (tetryl) channel leading to the magazine. The delay is obtained by means of a
pallet and escape wheel mechanism positioned beneath the shutter. The escape wheel is
fitted with a pinion which is in mesh with a segment on the side of the shutter. The pallet
acts as a pendulum and engages successive teeth in the escape wheel to retard the rotary
movement of the shutter. When the shutter reaches the fully armed position, it is locked by
the locking plate, which moves outward along its slot in the top face of the shutter to
engage in a recess in the shutter housing.
On impact or graze, the momentum of the striker holder overcomes the creep spring
and carries the striker needle forward to pierce the detonator. The resultant wave is
transmitted through the stemmed CE in the magazine channel, to the CE pellet in the
magazine, and thence to the bunting charge in the shell.
(C) Summary of Differences
? Model Al fuze (obsolescent). The model Al is fitted with delayed-arming
shutter No. 3B.
? Model A2 fuze. This model is fitted with delayed-arming shutter No. 3C,
3C/1, or 3C/2.
These shutters differ from the 3E in that they incorporate a 2.6 gr (0.17 graM ) "LZ"
detonator in lieu of a 2.8-gr (0.18-gram) "AZ" detonator. In addition these shutters differ in
the following way:
? No. 3C ? same body as No. 3B, i.e., die cast.
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AST-1160H-001-75
Fuze, BD, Model L29A1
FOM No. 1390-35-1-28
(C)
Summary of Differences (Continued)
? No. 3C/1 ? body machined from bar, it also incorporates a shutter-gaging
hole of increased diameter.
? No. 3C/2 ? body die cast, but incorporating a shutter-gaging hole of
increased diameter.
(C) Applications (Ammunition and Weapons)
Original
Ammunition
Weapons
105-mm HESH projectiles, Models
L35A2, L37A2, L43A1
120-mm HESH projectiles, Model L31A1
105-mm tank gun, Model L7A1;
105-mm howitzer, Model L10A1
120-mm tank gun, Model L11A1
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Original
COMPONENT PARTS
SE ALING DISK
STOP SCREW
SETBACK SLEEVE
AST-1160H-001-75
Fuze, BD, Model L16A1
FOM No. 1390-35-2-1
EJECTION SPRING
C. E. PELLET
PLUNGER
1.50" WAN -j
f20 UNS-2A)
GENERAL ASSEMBLY
Neg. 552506
(C) Description
ACTUATING CREEP
SLEEVE SPRING
LOCKING PIN WITH
SPRING AND PLUG
ACTUATING SLEEVE
PLUNGER
EJECTION PIN
STRIKER
SHUTTER PLATE
SHUTTER PLUG
PLATE MAGAZINE
PLUG
SETBACK SLEEVE
Figure 4-22. Fuze, BD, Model Ll6A1, exploded
and cutaway views (U).
SAFETY BAND
(CONFIDENTIAL)
The L16A1 (fig 4-22) is a setback-armed, OD fuze designed to function upon impact
With the target. Safety is provided by a steel safety band and a bore-riding pin. This fuze was
developed for use with the 88.9-mm (3-inch) HEAT warhead fired from the UK rocket
launcher, This fuze is considered bore safe by US standards.
(C) Unique Features
? Bore-riding pin and safety band.
? Out-of-line detonator.
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CONFIDENTIAL
AST-1160H-001-75
Fuze, BD, Model L16A1
FOM No. 1390-35-2-1
(C) Characteristics
Fuze assembly:
Body material
Weight
Markings
Length
Maj thread diam
Booster:
Body material
Body length
Explosive
Explosive weight
Anodized aluminum alloy
Li 6A1
3.5 in (88.9 mm)
2.00 in (50.8 mm)
Anodized aluminum alloy
20.3 mm (0.80 in)
Tetryl
Functional data:
Arming method Setback
Firing method Impact
Safety devices
Arming distance
Arming time
(C) Design Details
Original
General. The L16A1 fuze (fig 4-22) consists principally of a body, plug, magazine,
sealing disk, plunger, creep spring, actuating sleeve, setback sleeve, striker, shutter assembly,
detonator, stop screw, locking pin and spring, ejection pin, and safety band.
Body. The body is made of anodized aluminum alloy. It is cylindrical in shape and
formed plain, with an external diameter of 2 inches (50.8 mm). Internally, a shoulder is
formed towards the rear of the body on which an aluminum disk seats, and beyond the
shoulder the body is threaded to receive a body closing adapter. The rocket motor screws
into the adapter. The front portion of the body is internally threaded at the mouth to
accept a plug into which is screwed the magazine. In the side of the body a slot is cut for the
ejection pin, and adjacent to it a hole is drilled and threaded for a stop screw. Opposite to
*Bore-nding pin and safety band.
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Original AST-1160H-001-75
Fuze, BD, Model L16A1
FOM No. 1390-35-2-1
(C) Design Details (Continued)
the slot for the ejection pin, a recess is made to house the locking pin and spring, which are
retained in the recess by a small screwed plug. Adjacent to the locking pin, another pin is
inserted through the side of the fuze body to locate the shutter assembly and prevent it
from rotating.
Plug. The plug is made of anodized aluminum alloy. It is cylindrical in shape and
externally threaded (left handed) to 1.5-inch (38.10-mm) diameter (20 TPI, UNS-2A)
partially to screw into the front of the body and partially to engage in the screw threads
formed in the rocket head. Internally, it is recessed on two diameters, the larger being
threaded to accept the magazine; the smaller is filled with loose tetryl stemmed in, leaving a
thin diaphragm of metal between the base of the recess and the outer surface at the base of
the plug. Two key holes are drilled in front to facilitate assembly.
Magazine (i.e., booster). The body is made of anodized aluminum alloy. It is
cup-shaped and externally threaded to screw into the plug. Internally, it houses the
prepressed tetryl pellet. Two flats are formed on the base to facilitate assembly into the
plug.
Sealing disk. This is a dished disk of anodized aluminum alloy. It is assembled into the
rear of the body, with the flattened rim pressed against the shoulder formed in the body.
Plunger. The zinc-plated brass plunger is cone-shaped with a flange formed at the rear.
It is housed inside the body, the flange resting against the inner side of the shoulder formed
toward the rear of the body.
Creep spring. This is a cylindrical-coiled, tinned, steel-wire spring, formed with
21/2 effective coils of 0.02-inch (0.50-mm) diameter wire. One coil at each end is close-coiled
and square with the axis of the spring. It is assembled around the actuating sleeve.
Actuating sleeve. The actuating sleeve is made of zinc-plated steel. It is cylindrical in
shape and formed with a small external flange at the rear. A longitudinal slot is formed near
the center, and three slots are cut in the forward end. It is assembled around the plunger.
Setback sleeve. The setback sleeve is made of zinc-plated steel. It is cylindrical in shape
with longitudinal and radial slots cut in one side. It is assembled over and around the
actuating sleeve.
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CONFIDENTIAL
AST-1160H-001-75 Original
Fuze, BD, Model L16A1
FOM No. 1390-35-2-1
(C) Design Details (Continued)
Striker. The striker consists of a zinc-plated steel pin formed with a needle point,
above which is a flange and a shank; a flat double phosphor-bronze spring; and a steel
triangular-shaped plate lever formed with a lug at each side. The pin is riveted to the center
of the apex of the lever and to one end of the spring.
Shutter assembly. This comprises a shutter plate, shutter, shutter spring,
shutter-retaining spring, shutter-spring pin, shutter-hinge pin, and shutter-retaining-spring
pin. The shutter plate is a flat circular disk, with a slot formed on the outside to fit over a
locating pin inserted through the side of the fuze body adjacent to the locking pin. The end
of this pin positions the plate and keeps it from rotating. The front surface of the plate is
cut away and shaped to act as a guide for the shutter; around the periphery a slot is made to
accommodate the retaining spring. The shutter-hinge pin, shutter-spring pin and
shutter-retaining-spring pin are also assembled in the front surface of the plate. The rear
surface of the plate is recessed, leaving a small portion of metal to act as a stop to the
shutter when it is in the armed position. The shutter which is a flat, irregular-shaped
component has a hole drilled through the center, and the rear portion of the hole is enlarged
to house the detonator. On one side, near the detonator recess, are two small pins. These
pins bear against the side of the ejection pin which, when ejected, allows the shutter, under
the influence of the shutter spring, to swing into the armed position, thereby bringing the
detonator into alignment over the point of the striker. The shutter is assembled over the
hinge pin on which it pivots; it is moved into the armed position, when the ejection pin is
ejected, by a double-armed spring, which is assembled under tension over a pin positioned to
one side of the shutter plate. One arm of the spring bears against the side of the shutter,
while the other bears against the side of the shutter plate. In the armed position, a shoulder
on the shutter locks behind a projection on the free end of the shutter-retaining spring.
Detonator. This is a 0.18-gram (2.8-gr) "AZ" lugless (tinned copper alloy cup)
detonator that is assembled with the open end toward the striker. It is assembled in a recess
formed in the shutter and is held in position by a retaining washer secured by burring over
an upstand formed around the recess.
Stop screw. The screw, which is made of zinc-plated steel, has a screwdriver slot in the
head. It is assembled in the side of the body and acts as a guide for the setback sleeve and a
stop for the actuating sleeve.
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Original AST-1160H-001-75
Fuze, BD, Model L16A1
FOM No. 1390-35-2-1
(C) Design Details (Continued)
Locking pin and spring. The locking pin is made of zinc-plated brass and formed with
a flange around the center. It is assembled in the side of the fuze body, followed by a small
cylindrical-coiled, steel-wire spring, and is retained in the fuze body by a small screwed plug.
Ejection pin. The ejection pin is made of zinc-plated steel. It is formed from a square
bar, with a number of steps or keyways. A dome-shaped cup welded to the outer end of the
pin houses one end of a coiled steel-wire ejection spring when the pin is assembled in the
fuze. The ejection pin passes through the fuze body and is held in position by the safety
band which encircles the body. This pin prevents any movement of the internal parts during
storage, transit, and handling; it also retains the shutter in the unarmed position, precluding
any accidental functioning.
Safety band. The safety band is made of zinc-plated steel. It is formed from a flat steel
strip and is hinged in the center, the ends being fitted with an eyelet and an engaging lever
for securing purposes. The band is varnished over the zinc plating. Printed in red on one side
are the words "SAFETY BAND?NOT TO BE REMOVED UNTIL ROCKET HEAD HAS
BEEN LOADED INTO LAUNCHER." On the opposite side the legend is a raised boss fitted
with a hard rubber washer around the underside. The washer is retained by lugs turned over
onto its outer edges. Earlier versions had a loop instead of an eyelet and were painted green.
(C) Safety
Safety is provided as follows:
? The safety band secures the ejection pin in position.
? The ejection pin, which is held in position by the safety band during
transit and storage, passes between the striker and fuze shutter, preventing
contact between them. The ejection pin also keeps the shutter in the
unarmed position until after firing.
? The shutter is made with two metal stops which bear against the side of
the ejection pin and keep the shutter in the unarmed position until the pin
is ejected. In the unarmed position, the detonator is held away from the
striker and is out of alignment with the tetryl channel in the fuze plug.,
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CONFIDENTIAL
AST-116011-001-75 Original
Fuze, BD, Model L16A1
FOM No. 1390-35-2-1
(C) Functioning
The safety band is not removed until just before the rocket head is finally pushed
home into the launcher. Under the influence of its spring, the ejection pin moves out of the
safe into the locked position. The fuze cannot arm when the ejection pin is moving or when
the ejection pin is in either the safe or locked position. As the rocket enters the launcher,
the bore of the launcher depresses the ejection pin into the intermediate position, freeing
the setback sleeve to move upon firing. Until the rocket is fired the fuze is still safe, since
the ejection pin prevents the actuating sleeve, firing pin, and shutter from moving. If it
becomes necessary to remove the rocket from the launcher, the ejection pin will move
outward under the influence of its spring and reengage the setback sleeve, thus returning the
fuze to its locked position. The safety band can then be replaced, thereby returning the
ejection pin to its original safe position.
When the rocket is fired. The force of setback opposing the strength of the creep
spring moves the setback sleeve to its rearward position where it is retained by the locking
pin.
When the rocket leaves the muzzle of the launcher. The ejection pin is thrown clear of
the fuze, the shutter revolves under the influence of its spring. The pin is locked in the
armed position when a shoulder on the shutter locks behind a projection on the end of the
shutter-retaining spring. The fuze is thus fully armed.
During flight. The setback sleeve and the actuating sleeve are prevented from rotating
by the stop screw which passes through a slot provided in both sleeves. The striker spring
also prevents the striker from impinging on the detonator, and the creep spring retards the
forward movement of the plunger and actuating sleeve. The strength of the creep spring is
strong enough to retard the plunger and actuating sleeve and to prevent the fuze from firing
should the rocket strike a light object such as light brush or undergrowth.
Upon impact or graze with a heavy object. The inertial plunger and actuating sleeve
overcome the strength of the creep spring and move forward. The actuating sleeve, aided by
the weight of the plunger, bears on the lugs of the triangular frame on which the striker is
mounted. The striker spring is depressed and the striker point forced into the detonator
which, in turn, detonates the tetryl pellet in the magazine and the filling in the rocket head.
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;
CONFIDENTIAL
Original AST-116011-001-15
Fuze, BD, Model L16A1
FOM No. 1390-35-2-1
(C) Applications (Ammunition and Weapons)
Ammunition
Weapons
88.9-mm (3.5-in) HEAT warhead
UK M20 Mk 2 rocket launcher
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AST-1160H-001-75 Original
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Original
t
2 00"
DI AM
CONFIDENTIAL
PLUNGER
AST-116011-001-75
Fuze, BD, Model L5, M404,Mk 1
FOM No. 1390-35-2-2
CREEP SPRING
1 50 DIA(20 UN.S-2A)
ACTUATING SLEEVE SETBACK
SAFETY BAND
SEALING DISC
SETBACK
SLEEVE
BODY --
STOP SCREW
CREEP SPRING I
PLUNGER
SAFETY BAND
EJECTION PIN
_._ PLUG
?
ACTUATING SLEEVE STRIKER \ DETONATOR (86 GR AZYI
SETBACK SLEEVE LOCKING PIN AND SPRING
C E PELLET
PAPER DISC
MAGAZINE
SLEEVE
DETONATOR
SAFE POSITION
EJECTION PIN
SETBACK SLEEVE DETONATOR
SAFETY BAND
LOCKED POSITION
ROCKET LOADED
Neg. 552507 (CONFIDENTIAL)
Figure 4-23. Fuze, PD, Model L5, M404, Mk 1, exploded
and cutaway views (11).
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CONFIDENTIAL
AST1160H-00145 Original
Fun, BD, Model L5, M404Mk 1
FOM No. 1390-35-2-2
(C) Description
The L5 fuze (fig 4-23) is a setback-armed, BD type designed for use with HEAT
ammunition fired from the UK, M20, 3.5-inch rocket launcher. This fuze is obsolescent.
(C) Unique Features
? Bore-riding ejection pin and safety band.
? Actuating and setback sleeve.
(C) Characteristics
Fuze assembly:
Body material Anodized aluminum alloy
Weight
Markings L5, UK, M404 Mk 1
Length 3.145 in (79.88 mm)
Max diam 2.00 in (50.8 mm)
Plug thread diam 1.50 in (38.1 mm)
Booster:
Body material Anodized aluminum alloy
Body length 7
Explosive Tetryl
Explosive weight 7
Functional data:
Arming method Setback
Firing method Impact
Safety devices Safety band & ejection pin
Arming distance 7
Arming time
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Original AST-1160H-001-75
Fuze, BD, Model L5, M404,Mk 1
FOM No. 1390-35-2-2
(C) Design Details
General. The L5, UK M404 Mk 1 fuze (fig 4-23) is a base percussion detonating type
functioning with non-delay action on impact. It consists principally of a body, plug,
magazine, sealing disk, plunger, creep spring, actuating sleeve, setback sleeve, striker,
detonator, stop screw, locking pin and spring, ejection pin, and safety band.
Body. The body is made of anodized aluminum alloy. It is cylindrical in shape, formed
plain, with an external diameter of 2 inches (50.8 mm). Internally, a shoulder is formed
toward the rear of the body on which an aluminum disk seats, and beyond the shoulder the
body is threaded to receive a body-closing adapter onto which the rocket motor is screwed.
The front portion of the body is threaded internally at the mouth to accept a plug into
which the magazine is screwed. In the side of the body a slot is cut for the ejection pin, and
adjacent to it a hole is drilled and threaded for a stop screw. A recess is made opposite the
slot for the ejection pin to house the locking pin and spring, which are retained in the recess
by a small screwed plug.
Plug. This plug is made of anodized aluminum alloy. It is cylindrical in shape and
threaded externally (left handed) to 1.5-inch (38.1-mm) diameter (20 TPI UNS-2A)
partially to screw into the front of the body and partially to engage in the screw threads
formed in the rocket head. Internally, it is recessed on two diameters, the larger being
threaded to accept the magazine, the smaller housing the detonator. A circumferential recess
is formed around the face of the rear of the plug, and two holes are drilled in the front to
facilitate assembly. A paper disk is inserted between the plug and the magazine, being
secured to the face of the plug by shellac.
Magazine (i.e., booster). The magazine is made of anodized aluminum alloy. It is
cup-shaped and threaded externally to screw into the plug. Internally, it houses the
prepressed tctryl pellet. Two flats are formed on the base to facilitate assembly into the
plug.
Sealing disk. This is a dished disk of anodized aluminum alloy. It is assembled into the
rear of the body, and the rim of the disk is flattened by the shoulder formed in the body.
Plunger. The plunger is made of zinc-plated brass. It is cone-shaped with a flange
formed at the rear. It is housed inside the body, the flange resting against the inner side of
the shoulder formed toward the rear of the body.
4-97
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CONFIDENTIAL
AST-1160H-001-75 OriGinal
Fuze, BD, Model L5, M404,/vllc 1
FOM No. 1390-35-2-2
(C) Design Details (Continued)
Creep spring. This is a cylindrical-coiled, tinned, steel-wire spring, formed with two
and one-half effective coils of 0.02-inch diameter wire, one coil at each end being
close-coiled and ground square with the axis of the spring. It is assembled around the
actuating sleeve.
Actuating sleeve. The actuating sleeve is made of zinc-plated steel. It is cylindrical in
shape and formed with a small external flange at the rear. A longitudinal slot is formed near
the center and three slots are cut in the forward end. It is assembled around the plunger.
Setback sleeve. The setback sleeve is made of zinc-plated steel. It is cylindrical in shape
and a longitudinal and radial slot are cut in one side. It is assembled over and around the
actuating sleeve.
Striker. The striker consists of a zinc-plated steel pin formed with a needle point,
above which is a flange and a shank; a flat double phosphor-bronze spring; and a steel
triangular-shaped plate lever formed with a lug on each side. The pin is riveted to the center
of the apex of the lever and to one end of the spring.
Detonator. This is a 0.56-gram (8.6-gr) "AZY" (copper alloy cup) detonator that is
assembled with the open end toward the striker, behind a glazed board washer in a hole
formed in the center of the plug.
Stop screw. The screw is made of zinc-plated steel with a screwdriver slot in the head.
It is assembled in the side of the body and acts as a guide for the setback sleeve and a stop
for the actuating sleeve.
Locking pin and spring. The locking pin is made of zinc-plated brass formed with a
flange around the center. It is assembled in the side of the fuze body with its small,
cylindrical-coiled, steel-wire spring, which is retained in the fuze body by a small screwed
plug.
Ejection pin. The ejection pin is made of zinc-plated steel. It is formed from square
bar, with a number of steps or keyways. A dome-shaped cup is welded to the outer end and
houses one end of a coiled, steel-wire ejection spring when the pin is assembled in the fuze.
The ejection pin passes through the fuze body and is held in position by the safety band
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CONFIDENTIAL
Origins AST-1160H-001-75
Fuze, BD, Model L5, M404Mk 1
FOM No. 1390-35-2-2
(C) Design Details (Continued)
that encircles the body. This pin prevents any movement of the internal parts during
storage, transit, and handling; it also masks the detonator from the striker, thus precluding
any accidental functioning.
Safety band. The safety band is made of zinc-plated steel. It is formed from flat spring
strip, hinged in the center, and the ends are fitted with a loop and engaging lever for
securing purposes. The band is painted green and printed in red on the side are the words
"SAFETY BAND?NOT TO BE REMOVED UNTIL ROCKET HEAD HAS BEEN LOADED
INTO LAUNCHER." On the side opposite the legend is a raised boss, around the underside
of which is fitted a neoprene washer, which is retained by lugs turned over on to the outer
edges.
(C) Safety
The ejection pin, which is held in position by a hinged safety band, prevents any
movement of the internal parts during storage and handling and, in addition, masks the
8.6-gr (0.56-gram) "AZY" detonator from the striker.
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CONFIDENTIAL
AST-1160H-001-75
Fuze, BD, Model L5, M404Alk 1
FOM No. 1390-35-2-2
(C) Functioning (Fig 4-24)
ON FIRING
Original
STOP SCREW
CREEP SPRING
ON IMPACT OR GRAZE
DURING FLIGHT
NORMAL
ON LEAVING
LAUNCHER
DURING FLIGHT ON IMPACT
OR GRAZE
ACTION OF STRIKER
Neg. 552508 (CONFIDENTIAL)
Figure 4-24. Fuze, BD, Model L5, M404,Mk 1, functioning views (U).
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CONFIDENTIAL
Original AST-1160H-001-75
Fuze, BD, Model L5, M404,Mk 1
FOM No. 1390-35-2-2
(C) Functioning (Continued)
The safety band is not removed until just prior to the rocket head finally being pushed
home into the launcher, and under the influence of its spring the ejection pin moves out of
the safe position to lock in the setback sleeve. The fuze cannot arm when the ejection pin is
in either the safe or locked position. The bore of the launcher depressei the ejection pin into
the intermediate position as the rocket enters the launcher. The setback sleeve is then free
to move upon firing. Until the rocket is fired the fuze is still safe, since the ejection pin
prevents movement of the actuating sleeve and firing pin. If it becomes necessary to remove
the rocket from the launcher, the ejection pin will move outward and re-engage the setback
sleeve, thus returning the fuze to its locked position. The safety band can then be replaced,
thereby returning the ejection pin to the original safe position.
When the rocket is fired. The force of setback opposing the action of the creep spring
moves the setback sleeve to its rearward position, where it is held by the locking pin.
When the rocket leaves the muzzle of the launcher. The ejection pin is thrown clear of
the fuze and the fuze is fully armed.
During flight. The setback sleeve and the actuating sleeve are prevented from rotating
by the stop screw, which passes through a slot provided in both sleeves. The striker spring
also prevents the striker point from impinging on the detonator, and the creep spring retards
the forward movement of the plunger and actuating sleeve. The strength of the creep spring
is sufficient to retard the plunger and actuating sleeve and to prevent the fuze from firing
should the rocket strike a light object such as light brush or undergrowth.
Upon impact or graze with a heavy object. The inertial plunger and actuating sleeve
overcome the force of the creep spring and move forward. The actuating sleeve, aided by the
weight of the plunger, bears on the lugs of the triangular frame on which the striker is
mounted. The striker spring is depressed and the striker forced into the detonator which, in
turn, detonates the tetryl pellet in the magazine and the filling in the rocket head.
(C) Applications (Ammunition and Weapons)
Ammunition
Weapons
3-in HEAT warhead
3.5-in rocket launcher, UK Model M20 Mk 2
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AST-1160H-001-75
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Original
Firing Pin
CONFIDENTIAL
LTh
AST-1160H-001-75
Fuze, BDSD, Type?
FOM No. 1390-37-1-8
Booster Cup
---Upper Fuze Body
Firing Sleeve
Firing Spring
Arming Ball (4)
Shock Element Housing
Shock Element
Detonator
Detonator Rotor
Firing Sleeve Guide
----Lower Fuze Body
?Stake Pin
Neg. 552247
Spanner Hole (2)
(CONFIDENTIAL-NED)
Figure 4-25. Fine, BDSD, Type ?, section view (U).
NO FOREIGN DISSEM
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CONFIDENTIAL
AST-116 0H-001-75 Original
Fuze, BDSD, Type?
FOM No. 1390-37-1-8
(C) Description
This (fig 4-25) is a conventional, BD fuze with a self-destruct feature actuated by
projectile spin decay. The out-of-line detonator is mounted in a ball rotor. This fuze is used
with the 30x113 mm B APHE1 cartridge, Type 9532, which is designed for air-to-air use in
DEFA, Type 552 aircraft guns. The fuze is a copy, with minor modifications, of the
Oerlikon BDSD fuze, Type BZD-0236, which was developed prior to 1962. The fuze is
unmarked.
(C) Characteristics
Fuze assembly:
Body material Aluminum
Weight 41.3 g (0.09 lb)
Markings None
Booster:
Body material Steel
Body length 15.2 mm (0.60 in)
Explosive
Explosive weight 0.8 g (12.3 gr)
Functional data:
Arming method Spin
Firing method Impact
Safety devices Out-of-line detonator in ball rotor
Arming distance ?3 m (est)
Arming time 7
Self-destruct time 5-13 s (est)
Delay time 7
NO FOREIGN DISSEM
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Original AST-1160Hs001-75
Fuze, BDSD Type ?
FOM No, 139O-3718
(c-NFD) Design Details
Except for two Minor internal changes, this fuze is a copy of the Oetlikon fuze. BDSD,
Type BZD-0236. Changes include provision of a separate firings pin instead of the Oerlikon
one piece firing pin and firingspin bushing, and a booster cup that projects into the explosive
cavity. The fuze dig 4-26) consists of an aluminum turd hods) that contains a self-destract
mechanism, a firing pin, a hall rotor that contains an out-of-line detonator, and a booster. In
storage and shipment the fuze is kept safe by the out--of-hoe position of the detonator In the
rotor. Rotor position is maintained by pressure from the self-destruct spring and the shock
element. acting through the fning-pin bushing.
03tn* ?Sbank
Mt** 8*n
Firing . _
-
VS tAux 'Spring ?
Dtt.***s* ,irtze
4*
'rOihcrk X)arept
*bock amant 91*****
taut* thu* Aady
Neg. 552246 (CONFIDEN11A1.-NFD)
Figure 4-26. Fuze, BDSD, Type ?, exploded view (ln,
NO FOREIGN DISSEM
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CONFIDENTIAL
AST-1160H-001-75 Original
Fuze, BDSD, Type?
FOM No. 1390-37-1-8
(C-NFD) Functioning
Upon firing, setback forces cause the firing pin bushing to move to the rear, crushing
the shock element and further compressing the self-destruct spring. At this point centrifugal
force causes the arming balls to move outward and rearward, against the conical interior
surfaces of the self-destruct housing. This action moves the firing pin bushing further
rearward and restrains the self-destruct spring. Pressure on the rotor is now released.
Centrifugal force causes the unbalanced rotor, now free, to rotate until the detonator is
aligned with the firing pin. Upon impact, inertia added to the pressure of the compressed
self-destruct spring overcomes centrifugal force, acting on the arming balls. These balls are
forced inward into their recess in the firing-pin bushing, and the firing pin is driven into the
detonator, initiating detonation of the booster. If impact does not occur, projectile spin will
decay and centrifugal force decrease until the compressed self-destruct spring overcomes the
spin force on the arming balls and drives the firing pin into the detonator.
(C-NFD) Applications (Ammunition and Weapons)
Ammunition
Weapons
30x113-mm B APHEI cartridge, Type 9532
30-mm aircraft gun, DEFA, Type 552
NO FOREIGN DISSEM
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UNCLASSIFIED
Original
Section V.
TIME FUZES
5-1
(Reverse Blank)
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UNCLASSIFIED
Original AST-1160H-001-75
Section V.
TIME FUZES
GENERAL
(U) Time fuzes have been designed or are under development for artillery, rocket,
mortar, and recoilless ammunition applications. These fuzes are designed to function after a
predetermined time. "Time" refers to the length of time from the instant of firing the
weapon to the instant of functioning of the fuze. Some of the older obsolescent fuzes utilize
pyrotechnic time train rings, while the most recent developments utilize clockwork-type
time mechanisms.
(U) The mechanical timers employed are usually detented or restrained by a trigger
mechanism which is released on setback during firing or, in the case of the older types, the
pyrotechnic time train rings are initiated on setback by a stab-type firing pin.
(U) Recent mechanical time (MT) fuzes include a backup impact function, usually
incorporating a superquick action upon impact.
(U) The fuzes described in this section are for either high- or low-"g" acceleration,
and for fin- or spin-stabilized projectiles or warheads. Most of these fuzes require either
setback or centrifugal force environmental stimulus for arming.
(U) With the exception of some older obsolescent types, the fuze designs presented in
this handbook are well within the current state-of-the-art and, in some instances,
incorporate unique features.
5-3
(Reverse Blank)
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Original AST-II60H-001-75
INDEX
FOM No. Nomenclature* Page
1390-16-1-8-1
Fuze, MTSQ, Model DM 93
5-7
1390-16-1-14
Fuze, MTSQ, Model DOPPZ DM 53
5-13
1390-16-1-18
Fuze, MTSQ, Model DM 123
5-15
1390-16-1-29
Fuze, BD, Model BDZ DM 701
5-19
1390-16-1-32
Fuze, MTSQ, Model DOPPZ DM 43
5-21
1390-16-1-33
Fuze, MTSQ, Model DOPPZ DM 63
5-23
1390-16-1-34
Fuze, MTSQ, Model DOPPZ DM 73
5-25
1390-16-1-35
Fun, MTSQ, Model DOPPZ DM 103
5-27
1390-16-1-36
Fuze, MTSQ, Model DOPPZ DM 113
5-31
1390-17-1-15
Fuze, Time, Model ?
5-33
1390-17-1-20
Fuze, MT, Model MH 55
5-39
1390-17-3-1
Fuze, MT, Model CD-17
5-45
1390-18-1-8
Fun, MTSQ, Model 544 (Dixi)
5-49
1390-18-1-16
Fuze, MTSQ, 30-second (Tavaro)
5-53
1390-18-1-19
Fuze, MT, Model STIDR M/70, URVgrk
5-57
1390-35-1-6
Fuze, MTSQ, Model No. 213 Mk 5
5-59
1390-35-1-29
Fuze, Time, Model No. 390 Mk 1
5-67
1390-37-1-4
Fuze, Time, Model?
5-75
1390-37-1-6
Fuze, Time, Model?
5-79
*All fine nomenclatures are UNCLASSIFIED.
5-5
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UNCLASSIFIED
AST-1160H-001-75
LIST OF ILLUSTRATIONS
Figure Title*
Original
Page
5-1
Fuze, MTSQ, Model DM 93, contour view
5-7
5-2
Fuze, MTSQ, Model DM 93, section view
5-9
5-3
Fuze, MTSQ, Model DM 93, setback device
5-11
5-4
Fuze, MTSQ, Model DM 93, packaging container
5-12
5-5
Fuze, MTSQ, Model DOPPZ DM 53, full view
with packaging container
5-13
5-6
Fuze, MTSQ, Model DM 123, full view
5-15
5-7
Fuze, MTSQ, Model DOPPZ DM 103, full view
5-27
5-8
Fuze, MTSQ, Model DOPPZ DM 103, section
view
5-28
5-9
Fuze, time, Model ?, contour view with 60-mm
mortar projectile
5-33
5-10
Fuze, time, Model ?, exploded view
5-35
5-11
Fuze, time, Model ?, section view
5-36
5-12
Fuze, MT, Model MH 55, with 60-mm illumination
projectile
5-39
5-13
Fuze, MT, Model MH 55, exploded view
5-41
5-14
Fuze, MT, Model CD-17, full view
5-45
5-15
Fuze, MT, Model CD-17, contour and section
views
5-47
5-16
Fuze, MTSQ, Model 544, full view
5-49
5-17
Fuze, MTSQ, Model 544, section view
5-51
5-18
Fuze, MTSQ (Tavaro), contour and section
views
5-54
5-19
Fuze, MT, Model STIDR M/70, URVgrk
5-57
5-20
Fuze, MTSQ, Model No. 213 Mk 5, full and
section views
5-59
5-21
Fuze, time, Model No. 390 Mk 1, full and
section views
5-67
5-22
Fuze, time, Model ?, exploded view and
52-mm projectile
5-75
5-23
Fuze, time, Model ?, contour and section
views
5-77
5-24
Fuze, time, Model ?, full view with
projectile
5-79
5-25
Fuze, time, Model ?, exploded view
5-81
5-26
Fuze, time, Model ?, contour and section views
5-82
*All figure titles are UNCLASSIFIED.
5-6
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original AST-116014-00145
Fuze, MTSQ, Model DM 93
FOM No. 1390-16-1-8-1
Neg. 516978
ALL DIMENSIONS IN MM
(UNCLASSIFIED)
Figure 5-1. Fuze, MTSQ, Model DM 93, contour view (U).
(U) Description
The DM 93 fuze (fig 5-1) is a delayed-arming-type MT fuze desired with a
backup SQ impact function. It was developed by Junghans of West Germany for use with
illumination and colored-marker mortar projectiles. The clockwork employed is a 60-second
timer with 2-second graduations indexed on the fuze body. The backup impact function is
provided by a protruding-type striker, permitting a graze-sensitivity feature.
5-7
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75
Fuze, MTSQ, Model DM 93
FOM No. 1390-16-1-8-1
(U) Unique Features
? Pull wire for positive safety during handling.
? Spring-loaded eccentric rotor housing out-of-line detonator.
? Locking shaft-pinion-gear arrangement for delay arming.
? Protruding striker-firing pin assembly.
? Double-safety mechanism via two setback pins.
(U) Characteristics
Fuze assembly:
Body material
Weight
Markings
Length
Body diam
Expelling charge cup:
Body material
Body length
Explosive
Explosive weight
Aluminum (est)
202 ?-5 g (0.44 lb ? 77 gr)
DOPPZ DM 93
87.7 mm (3.45 in)
49 mm (1.93 in)
Aluminum
Black powder
Functional data:
Arming method
Firing method
Safety devices
Arming distance
Arming time
Setback
Mechanical time & impact
50 m
is
'2 setback pins, 2 locking balls, locking spnng, pull wire, and ou t-of.line detonator.
5-8
UNCLASSIFIED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
Original
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original AST-1160H4101-75
Fuze, MTSQ, Model DM 93
FOM No. 1390-164-8-1
(U) Design Details
The DM 93 MTSQ fuze (fig 5-2) consists primarily of a two-piece movable setting cap
(1), a fuze body (2), a rear plug (3), and an expelling charge cup (4).
(UNCLASSIFIED)
Figure 5-2. Fuze, MTSQ, Model DM 93, section view (U).
The movable nose cap is bored out to house the protuding-type striker-firing pin
assembly which consists of a striker head (5), conical-shaped striker bushing (6),
striker-bushing compression spring (7), striker stem (8), bushing support (19), firing-pin
5-9
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1113011-001-75
Fuze, MTSQ, Model DM 93
FOM No. 1390-16-1-8-1
Original
(U) Design Details (Continued)
head (10), and firing pin (29). The firing pin extends through the timer drum (12), setback
device (20) and engages a blind hole of the eccentric rotor (9) when in the safe position.
The mechanical timer (see sec VIII for detailed illustrations) includes the release lever
(24) connected to the firing lever (23), which has a bent tongue that leans downward against
a cam on the timer drum cover (14), which is riveted to the timing ring (13). Other
components include a coupling ring (11), setting stop pin (not shown), timer drum (12)
housing a wound band spring, and pinion-gears (17). The first of the pinion gears (16)
meshes with a toothed segment of the rotors' locking shaft (18) that engages a slotted
keyway of the eccentric rotor (9). The anchor or pallet (28) of the clockwork is held in
check by the two upper stems (26) of the two setback pins (25).
The setback device (see sec VIII for design illustration) is a double-safety mechanism
including two setback pins (25) with an upper stem (26) and a lower collar (27), two
setback springs, and a setback sleeve. The setback pins are locked in place by two locking
balls held in position by a V-shaped locking spring. For positive safety during handling, a
pull wire (21) secures the setback pins.
The rear plug (13) is bored out to house the eccentric rotor (9). The rotor has a slotted
keyway for engaging the locking shaft (18). Two holes are drilled around the periphery of
the rotor: one houses the SQ detonator; the other is a blind hole for the firing pin (29). In
addition, a central hole has been drilled for housing the torqued spring that rotates the rotor
until it is stopped by a pin. The rotor is then in the armed position (i.e., the detonator is in
line with the firing pin).
The rear plug (3) is threaded externally to facilitate assembly into the fuze body (2)
and assembly of the expelling charge cup (4) housing a black powder expelling charge (22).
(U) Functioning
Prior to firing, the movable nose cap is turned to the desired time setting indicating
time of flight and the pull-wire is released.
Upon firing, setback force moves the setback sleeve (3) of the setback device (fig 5-3)
rearward, forcing the two locking balls and V-shaped locking spring outward. This undetcnts
the two setback pins (4), which move rearward compressing their springs. This allows the
anchor or pallet of the timer (see fig 5-2) to swing free as a result of the upper stems (2) of
the setback pins (4) moving rearward on setback.
5-10
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
-UNCLASSIFIED
Original
(U) Functioning (Continued)
AST-1160H-001-15
Fuze, MTSQ, Model DM 93
FOM No. 1390-16-1-8-1
Neg. 517469
(UNCLASSIFIED)
Figure 5-3. Fuze, MTSQ, Model DM 93, setback device (U).
In the meantime, the lower collars of the setback pins (4) disengage from their seats in
the eccentric rotor, undetenting the rotor which is freed to rotate to the armed position.
Arming is delayed until the locking shaft moves out of the slot of the rotor. This takes
about 1 second.
As soon as the timer has reached the prescribed time delay, according to the setting on
the fuze body, the striker bushing spring moves downward, pushing the firing-pin lever and
release lever apart and hitting the firing-pin head. The firing pin is driven into the detonator
(1), which initiates the relay charge and, in turn, the black powder expelling charge.
5-11
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, MTSQ, Model DM 93
FOM No. 1390-16-1-8-1
(U) Packaging
1
Neg. 516988 (UNCLASSIFIED)
Figure 5-4. Fuze, MTSQ, Model DM 93,
packaging container (U).
The DM 93 fuze is individually packaged in a special contour-shaped plastic container
(fig 5-4).
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
60-mm illumination projectiles;
60-mm colored smoke projectiles
81-mm illumination projectiles;
81-mm colored smoke projectiles
120-mm illumination projectiles;
120-mm colored smoke projectiles
60-mm mortars
81-mm mortars
120-mm mortars
5-12
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
FOR OFFICIAL USE ONLY
Original
A 6 -7
Fuze, MTSQ, Model DOPPZ DM 53
FOM No, 1390-16414
(1INCLASSIFI
5-5. Fuze MTSQ, Model DOPPZ DM 53, full view
with packaging coot
FOR OFFICIAL USE ONLY
(This ',age I UNC1,ASS I FIEF
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
FOR OFFICIAL USE ONLY
AST-1160H-001-75 Original
Fuze, MTSQ, Model DOPPZ DM 53
FOM No. 1390-16-1-14
(FOUO) Description
Fuze DOPPZ DM 53 is a West German (Diehl) produced copy of US fuze, MTSQ,
M501A1. No booster is used. This fuze was standard in the West German Armed Forces at
least as late as 1969. See pertinent US publications (e.g., TM-9-1300-203) for a functioning
description and technical data for this fuze.
(FOUO) Applications (Ammunition and Weapons)
Ammunition
Weapons
Various illuminating, smoke,
and colored smoke rounds from
76 mm to 203 mm
76-mm to 203-mm guns and
howitzers
(FOUO) Interchangeability
Fuze DOPPZ DM 53 has no booster. Fuze DOPPZ DM 53 is redesignated DOPPZ DM
63 when booster ZDL DM 12 is used. Fuze DOPPZ DM 53 is redesignated DOPPZ DM 103
when German booster ZDL DM 32 (a copy of US booster M125A1) is used. Fuze DOPPZ
DM 53 is redesignated DOPPZ DM 113 when German booster ZDL DM 42 is used.
(U) Packaging
Each fuze is packed in an individual watertight can. Each fuze can is equipped with a
pull-ring opener to ensure easy access to the fuze for firing. Fifteen or 40 fuze cans are
packed into each shipping box. Although definite information is not available, the packaging
described here may be standard for all fuzes manufactured by Diehl.
5-14
FOR OFFICIAL USE ONLY
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UNCLASSIFIED
Origins AST-1160H-001-75
Neg. 516989 (UNCLASSIFIED)
Figure 5-6. Fuze, MTSQ, Model
DM 123, full view (U).
(U) Description
Fuze, MTSQ, DM 123
FOM No. 1390-16-1-18
The DM 123 fuze (fig 5-6) is a setback, delayed-arming MT fuze with an SQ impact
function. It was developed by Junghans for use with 60-, 81-, and 120-mm high explosive
projectiles. It is similar in design and functioning to that of the DM 93 fine (FOM No.
1390-16-1-8-1), except that the black powder expelling charge has been replaced by a tetryl
booster.
(U) Unique Features
? Pull-wire for positive safety during handling.
5-15
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75
Fuze, MTSQ, DM 123
FOM No. 1390-16-1-18
(U) Unique Features (Continued)
? Locking shaft-pinion-gear arrangement for delay arming.
? Protruding striker-firing pin assembly.
? Double-safety mechanism via two setback pins.
(U) Characteristics
Fuze assembly:
Body material
Weight
Markings
Length
Body diam
Aluminum (est)
202?5 g (0.44 lb ? 77 gr)
DOPPZ DM 123
87.7 mm (3.45 in)
49 mm (1.93 in)
Booster:
Body material Aluminum (est)
Body length
Explosive Tetryl
Explosive weight
Functional data:
Arming method Setback
Firing method Mechanical time and impact
Safety devices
Arming distance 50 m
Arming time 1 s
?2 setback pins, 2 locking balls, locking spting, pull-wire, and out-of-line detonator.
5-16
UNCLASSIFIED
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Original
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Origind AST-1160E1-001-75
Fuze, MTSQ, DM 123
FOM No. 1390-16-1-18
(U) Design Details and Functioning
Design details and functioning are the same as the DM 93 MTSQ fuze (FOM No.
1390-16-1-8-1). See Section VIII for further details on the 60-second timer employed. The
contour of the DM 123 fuze being the same as the DM 93 permits packing in the special
contour plastic container developed for the DM 93 fuze.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
60-mm HE projectiles
81-mm HE projectiles
120-mm HE projectiles
60-mm mortar
81-mm mortar
120-mm mortar
5-17
(Reverse Blank)
UNCLASSIFIED
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BLANK PAGE
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
FOR OFFICIAL USE ONLY
Original AST-1160H-001-75
Fuze, BD, Model BDZ DM 701
FOM No. 1390-16-1-29
(FOUO) Description
According to an official West German source, fuze BDZ DM 701 th a German-produced
copy of US fuze, BD, M68 Al. This fuze was standard in the West German Armed Forces, at
least as late as 1969. See pertinent US publications (e.g., TM 9-1300-203) for technical
details of this fuze.
(FOUO) Applications (Ammunition and Weapons)
Ammunition
Weapons
90x602-mm HE cartridge,
Model PBK-LS
90-mm guns
5-19
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FOR OFFICIAL USE ONLY
AST-1160H-001-75
(This page intentionally left blank)
5-20
FOR OFFICIAL USE ONLY
(This page is UNCLASSIFIED)
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Original
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
FOR OFFICIAL USE ONLY
Original AST-11601I-001-75
Fuze, MTSQ, Model DOPPZ DM 43
FOM No. 1390-16-1-32
(FOUO) Description
Fuze DOPPZ DM 43 is a West German-produced copy of US fuze, MTSQ, M502A1.
This fuze was standard in the West German Armed Forces at least as late as 1969. See
pertinent US publications (e.g., TM 9-1300-203) for technical details of this fuze.
(FOUO) Applications (Ammunition and Weapons)
Ammunition
Weapons
90x602-mm HE cartridge,
Model (?)
90-mm antiaircraft guns
5-21
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
FOR OFFICIAL USE ONLY
AST-1160H-001-75 Original
(This page intentionally left blank)
5-22
FOR OFFICIAL USE ONLY
(This page is UNCLASSIFIED)
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
FOR OFFICIAL USE ONLY
Original AST-1160H-001-75
Fuze, MTSQ, Model DOPPZ DM 63
FOM No. 1390-16-1-33
(FOUO) Description
Fuze DOPPZ DM 63 is a DOPPZ DM 53 fuze (see FOM No. 1390-16-1-14) with a
German booster, Model ZDL DM 12, attached. The characteristics of the ZDL DM 12
booster are not known to US intelligence elements. Except for this booster assembly, which
may. be of German design, the characteristics of fuze DOPPZ DM 63 are those of US fuze,
MTSQ, M501A1. This fuze, manufactured by Diehl of West Germany, was standard in the
West German Armed Forces, at least as late as 1969.
(FOU0) Applications (Ammunition and Weapons)
Ammunition
Weapons
90x602-mm practice cartridge,
Model (?)
105x373-mm cartridges,
Models (?)
155-mm projectiles,
Models (?)
175-mm practice projectile,
Model (?)
203-mm HE projectile,
Model (?)
90-mm antiaircraft guns
105-mm guns or howitzers
155-mm howitzers
175-mm gun, M107 (US)
203-mm howitzers
(U) Interchangeability
Fuze DOPPZ DM 63 is redesignated DOPPZ DM 53 when used without a booster. Fuze
DOPPZ DM 63 is redesignated DOPPZ DM 103 when German booster ZDL DM 32 (a copy
of US Booster M125A1) is used. Fuze DOPPZ DM 63 is redesignated DOPPZ DM 113 when
German booster ZDL DM 42 is used.
5-23
FOR OFFICIAL USE ONLY
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
FOR OFFICIAL USE ONLY
AST-1160H-001-75 Original
Fuze, MTSQ, Model DOPPZ DM 63
FOM No, 1390-16-1-33
(U) Packaging
Packaging for this fuze is believed to be the same as for fuze DOPPZ DM 53 (see FOM
No. 1390-16-1-14) except for slight differences necessary to accommodate the different
lengths of the different fuze models.
5-24
FOR OFFICIAL USE ONLY
(This page is UNCLASSIFIED)
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
FOR OFFICIAL USE ONLY
Original AST-1160H-001-75
Fuze, MTSQ, Model DOPPZ DM 73
FOM No. 1390-16-1-34
(FOUO) Description
According to an official West German Government publication, this is the No. 554
fuze, designed by the Dixi Company of Switzerland, assembled with German booster, Model
ZDL DM 42. It is uncertain whether the fuze body is Swiss manufactured or merely Swiss
designed. Diehl is known to produce booster ZDL DM 42, but it is unknown whether Diehl
is the sole producer of this booster. We presently hold no information on the Dixi No. 554
fuze. Some information on booster ZDL DM 42 is available in the article on PD fuze, Model
AZ DM 211 (see FOM No. 1390-16-1-26) elsewhere in this handbook. This fuze was
standard in the West German Armed Forces, at least as late as 1969.
(FOUO) Applications (Ammunition and Weapons)
Ammunition
Weapons
105x373-mm cartridges, Models?
155-mm HE projectile, Model ?
105-mm guns or howitzers
155-mm howitzers
5-25
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FOR OFFICIAL USE ONLY
AST-1160H-001-75
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5-26
FOR OFFICIAL USE ONLY
(This page is UNCLASSIFIED)
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Original
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
FOR OFFICIAL USE ONLY
Original AST-115011-001-75
Fuze, MTSQ, Model DOPPZ DM 103
FOM No. 1390-16-1-35
Neg.515124 (UNCLASSIFIED)
Figure 5-7. Fuze, MM, Model DOPPZ
DM103, full view (U).
(FOUO) Description
Fuze DOPPZ DM 103 (fig 5-7), a West German-manufactured (Diehl) copy of US fuze.
MTSQ, M520A1, was standard in the West German Armed Forces at least as late as 1969.
German booster ZDL DM 42 (a copy of US booster Ml 25A1) is used. Times between 2 and
75 seconds may be set in 0.5-second increments. When no time is set (fuze setting "S-), this
fuze functions as an SQ PD fuze. This fuze contains a clockwork mechanism (see fig 5-8) to
5-27
FOR OFFICIAL USE ONLY
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
FOR OFFICIAL USE ONLY
AST-1160H-001-75 Original
Fuze, MTSQ, Model DOPPZ DM 103
FOM No. 1390-16-1-35
(FOU0) Description (Continued)
ensure delayed arming. A safety wire is used during transport as an additional safety feature.
See pertinent US publications (e.g., TM 9-1300-203) for additional technical data.
(U) Characteristics
Material used:
Nose portion Aluminum
Central body portion Brass
Timing ring and lower body Aluminum
Timing mechanism Brass and aluminum
Booster (except booster cup) Brass
Booster cup Aluminum
Head
relay
detonator
eat ety pin
lead charge
clockwork mechanism
detonator
:toaster M 125 Al, altemativ
boaster DM 42
Neg. 515122
(UNCLASSIFIED)
Figure 5-8. Fuze, MTSQ, Model DOPPZ DM 103,
section view (U).
5-28
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
FOR OFFICIAL USE ONLY
Original AST-1160H-001-75
Fuze, MTSQ, Model DOPPZ DM 103
FOM No. 1390-16-1-35
(FOU0) Applications (Ammunition and Weapons)
Ammunition
Weapons
105x373-mm smoke ("fog") cartridge,
Model (?)
155-mm HE projectile, Model (?)
175-mm practice projectile,
Model (?)
203-mm HE projectile, Model (?)
105-mm guns or howitzers
155-mm howitzers
175-mm guns (US M107)
203-mm howitzers
(FOUO) Interchangeability
Fuze DOPPZ DM 103 is redesignated DOPPZ DM 53 when used without a booster.
Fuze DOPPZ DM 103 is redesignated DOPPZ DM 63 when reassembled with German
booster ZDL DM 12. Fuze DOPPZ DM 103 is redesignated DOPPZ DM 113 when
reassembled with German booster ZDL DM 42.
(U) Packaging
It is believed that this fuze uses the same packaging (with minor changes in container
dimensions) as is described in the article on fuze DOPPZ DM 53 (FOM No. 1390-16-1-14)
elsewhere in this handbook.
5-29
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FOR OFFICIAL USE ONLY
AST-1160H-001-75
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(This page is UNCLASSIFIED)
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Original
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
FOR OFFICIAL USE ONLY
Original AST-1160H-001-75
Fuze, MTSQ, Model DOPPZ DM 113
FOM No. 1390-16-1-36
(FOUO) Description
Fuze DOPPZ DM 113 is a West German-manufactured (Diehl) US fuze, MTSQ,
M501A1 (German Model DOPPZ DM 53) with a German-designed booster, Model ZDL DM
42, attached. This fuze was standard in the West German Armed Forces at least as late as
1969. For information on booster ZDL DM 42, see the article on fuze AZ DM 211 (FOM
No. 1390-16-1-26). For technical details of this fuze (except for the booster), see pertinent
US publications (e.g., TM 9-1300-203).
(FOUO) Applications (Ammunition and Weapons)
Ammunition
Weapons
90-mm practice cartridge, Model (?)
105x373-mm cartridges, Models (?)
155-mm projectiles, Models (?)
175-mm practice projectile,
Model (?)
203-mm HE projectile, Model (?)
90-mm guns
105-mm guns or howitzers
155-mm howitzers
175-mm guns (US M107)
203-mm howitzers
(FOUO) Interchangeability
Fuze DOPPZ DM 113 is redesignated DOPPZ DM 53 when used without a booster.
Fuze DOPPZ DM 113 is redesignated DOPPZ DM 63 when reassembled with German
booster ZDL DM 12. Fuze DOPPZ DM 113 is redesignated DOPPZ DM 103 when
reassembled with German booster ZDL DM 32 (a copy of US booster M125A1).
(U) Packaging
It is believed that packaging for this fuze is the same as for fuze DOPPZ DM 53 (see
FOM No. 1390-16-1-14), except for small differences in package dimensions necessary to
accommodate the DOPPZ DM 113.
5-31
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FOR OFFICIAL USE ONLY
AST-116011-001-75 Original
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(This page is UNCLASSIFIED)
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CONFIDENTIAL
Original
AST-1160H-001-75
Fuze, Time, Model ?
FOM No. 1390-17-1-15
..--Z.SaCini,V01{44X
Itattil4Ail PiAlit
t20Tril
fab%OisSM $S4 acsn ,
Neg. 516409
(UNCLASSIFIED)
C L ASS I F IE D)
Figure 5-9. Fine, time, Model ?, contour view with 60-mm
mortar projectile (U).
(C) Description
The French time fuze, Model ? (fig 5-9), was developed for the M50 illuminating
mortar projectiles. It is a setback-initiated fuze with an adjustable pyrotechnic time train
delay from 4 to 20 seconds, It also has a night adjustment of 12, 15, and 20 seconds delay.
The fuze is not bore safe. The only safety device is a pin that passes through the body and
firing pin.
5-33
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CONFIDENTIAL
AST-116011-001-75 Original
Fine, Time, Model?
FOM No. 1390-17-1-15
(C) Characteristics
Fuze assembly:
Body material Aluminum
Weight 0.89 lb (403 g)
Length (overall) 2.27 in (57.6 mm)
Length (exposed) 2.05 in (46.3 mm)
Max diam 2.32 in (59 mm)
Thread diam 2.05 in (51.8 mm)
TPI 20
No. of vent holes 9
No. of relay pellets 2
Relay pellet expl. Black powder
Relay expl. weight 0.08 g (1.23 gr)
Expulsion charge expl. Black powder
Expulsion charge weight 2.55 g (39.27 gr)
Time train ring explosive Black powder
Tinie train ring material Brass
Functional data:
Arming method Setback
Firing method Impact
Safety devices Safety pin
Arming distance 7
Arming time
Delay time 4 thru 20 s
5-34
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CONFIDENTIAL
Original AST-1160H-001-75
(C) Design Details
FIRING PIN
RETAINING PLUG
SETBACK SPRING
FUZE BODY
FIBER DISK
Fuze, Time, Model ?
FOM No. 1390-17-1-15
FIBER WASHER
METAL WASHER
RETAINING NUT
SAFETY PIN
TIME TRAIN RING
7ALUMINUM RING
LOCK WASHER
RETAINING RING
RETAINING
Neg. 516413 (UNCLASSIFIED)
Figure 5-10. Fuze, time, Model ?, exploded view (U).
The fuze (fig 5-10) consists of an aluminum fuze body and a movable brass time train
ring.
The nose portion of the fuze body is counterbored to house the stab-type primer,
setback spring, and firing pin, which are secured by a retaining plug.
The fuze body has nine vent holes drilled into the outer surface and downward to vent
the black powder charge located in the circle groove of the time train ring.
The movable time ring can be manually set to any of the locations marked on the fuze
body. There is a niche-and-groove arrangement on the time ring. A spring-wire pin enters the
niche dictated by the indenting arrangement. The delay settings for night use are 12, 15, and
20 seconds.
5-35
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CONFIDENTIAL
AST-1160H-001-75 Original
Fuze, Time, Model?
FOM No. 1390474-15
(C) Design Details (Continued)
The time ring houses the black powder relay, black powder time train, and another
black powder relay crimped into the passage through the time ring. The lower portion of
time ring contains the black powder expulsion charge, held in place by an aluminum ring,
and a cloth-covered disk and retainer that screws into the time ring.
(C) Functioning
Neg. 516411
7 5
(UNCLASSIFIED)
Figure 5-11. Fuze, time, Model ?, section view (U).
Prior to firing the safety pin is removed.
Upon firing, setback causes the firing pin (1) to compress thc setback spring (2) and to
stab the primer (3), which ignites the black powder relay (4), initiating the black powder
time train (5). After the time train burns its prescribed delay time according to the fuze
5-36
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Original AST-1160H-001-75
Fine, Time, Mode!
FOM No. 1390-17-1-15
(C) Functioning (Continued)
setting, the black powder relay pellet (6) is ignited, initiating the black powder expelling
charge (7) which ejects the parachute and the ignited candle.
(11) Applications (Ammunition and Weapons)
Ammunition
Weapons
60-mm illuminating projectile,
Model 51
Brandt 60-mm mortar
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AST-1160H-001-75
CONFIDENTIAL
Original
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UNCLASSIFIED
Original
AST-116011-00145
Fuze,MT. Model
FOM No, 139O
(UNCLASSIFIED)
Figure 542. Fuzc MT. Model MU 55, with 6Onini
I project). (I)
5-39
UNCLASSIFiED
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, MT, Model MH 55
FOM No. 1390-17-1-20
(U) Description
The French MH 55 MT fuze (fig 5-12) was developed by Hotchkiss-Brandt for 60-mm
illumination projectiles fired from the Commando mortar. It employs a 35-second
mechanical timer graduated from 7 to 35 seconds.
(U) Design Details
The fuze consists of three principal parts: the fuze body, the clockwork mechanism
(i.e., timer), and a movable head.
The fuze body is secured to the body of the projectile by steel rivets. It contains a
stab-type detonator and a black powder expelling charge. A spring plunger, located between
the body and movable head, enables the fuze to be set at any of three pre-selected click-stop
settings (18, 22, or 24 1/2 seconds).
The clockwork mechanism or timer contains a striker, mainspring, gear train, and
escapement, together with several mechanical devices controlling safety and arming.
The movable head of the fuze is keyed to the fuze body and pinned to the lower part
of the clock mechanism.
5-40
UNCLASSIFIED
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Original AST-11608-001-75
(U) Safety
13
14
25
_15
16
Fun, MT, Model MH 55
FOM No.1390-17-1-20
Neg. 516580
(UNCLASSIFIED)
Figure 5-13. Fuze, MT, Model MH 55,
exploded view (U).
5-41
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UNCLASSIFIED
AST-1160H-001-75
Fuze, MT, Model MH 55
FOM No. 1390-17-1-20
(LI) Safety (Continued)
Safety of the fuze (fig 5-13) is provided as follows:
? The spring-loaded striker (17,2) is prevented from striking the detonator
(1) by its flange, which engages firing arm (25). A cutout slot in rear of
the striker (2) engages an arm of the safety lever (19).
? The firing arm (25) is held in position by a torsion spring, and the safety
lever (19) is held by the tongue of the steel plate (9).
? A dowel pin (7) of the safety lever (19) prevents movement of the pellet
(8).
? A gas-operated piston (23), whose function is to bend the tongue of the
spring steel plate (9) away from the safety lever (19), is prevented from
moving by a safety pin (12) passing through the tail of the projectile.
(U) Functioning (fig 5-13)
Original
Prior to firing. Before the projectile is loaded in the mortar, the safety pin (12) is
removed from the fuze. Variations in time setting are obtained by altering the relative
positions of the pin of the firing lever and the perforations in the timing disk.
Upon firing. When the mortar is fired, gases from the burning propellant enter the
rear of the fuze and force the piston (23) forward. The top of the piston strikes the tongue
of the spring steel plate (9) and bends it upward free of the downward projecting arm of the
safety lever (19). Once the safety lever is free of the steel plate, the torsion spring (6) turns
the safety lever about its pivot point. As the safety lever turns, its upward projecting arm (5)
moves out of the cutout recess in the tail of the striker, and its dowel pin (7) moves clear of
the pallet (8).
Time mechanism operation. The pallet is then free to oscillate, driven by the
prewound mainspring (4) and controlled by its hair spring. As the mainspring runs down, it
turns the timing disk (3). A pin (15) in the firing arm (25) bears on the upper surface of the
rotating timing disk. When the set time has elapsed, a perforation (16) in the timing disk
coincides with the pin which drops into the recess. Further movement of the timing disk
causes the firing arm to swing about its pivot, overcoming the torsion spring and moving
clear to the flange of the striker.
5-42
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UNCLASSIFIED
Original
(U) Functioning (Continued)
AST-1160H-001-75
Fuze, MT, Model Ml-! 55
FOM No. 1390-17-1-20
Striker operation. The striker (2) is then free and is thrown forward into the
detonator (1) by its spring (17)..
5-43
(Reverse Blank)
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BLA
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UNCLASSIFIED
original AST-1160H-001-75
Neg. 517123
(UNCLASSIFIED)
Figure 544, Fuze, MT, Model CD-17,
full view (U),
(0) Description
Fuze, MT, Model CD-17
FOM No, 139047-34
The CD47 mechanical time fuze (fig 544) was developed by rhe French for use with
photo flash or cluster bombs. It is a vane arming type employing a mechanical timer. Fuze
may be set from 5 to 90 seconds time of flight by loosening a knurled head set screw and
rotating setting dial to ?prescribed time. Safety during handling and transportation is
accomplished via a seated wire inserted through the fuze nose clamp lever and timing disk
pin stop.
5-45
UNCLASSIF D
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, MT, Model CD-17
FOM No. 1390-17-3-1
(U) Unique Features
? Clockwork mechanism driven by runaway escapement detented by a stop
Pin.
? Spring-loaded firing pin detented by a safety block and locking ball.
? Air vane arming technique.
? Sealed wire locking nose clamp and timing disk stop pin.
(U) Characteristics
Fuze assembly:
Body material Aluminum
Weight 0.83 lb (376 g)
Length 4.10 in (104 mm)
Max diam 1.63 in (41 mm)
Max thread diam 1.48 in (37.6 mm)
Booster:
Body material Aluminum
Type Stab
Explosives:
1st charge Potassium chlorate, antimony sulfide,
nitride
2d charge Nitride
3d charge Tetryl
Explosive wt:
1st charge 0.03 g (0.46 gr)
2d charge 0.275 g (4.23 gr)
3d charge 0.1 g (1.5 gr)
Functional data:
Arming method Air vane
Firing method Impact
Safety devices
Arming distance **
Arming time
*Sealed wire locking fuze nose clamp and timing disk stop pm, safety block detent on spring-loaded firing pin, ball detent
on spring-loaded firing pm.
**Fuze arms after 10 revolutions of arming vanes.
5-46
UNCLASSIFIED
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UNCLASSIFIED
Original
(U) Functioning (fig 5-15)
4
36
AST-116011-001-75
Fuze, MT, Model CD-17
FOM No. 1390-17-3-1
II
ALL DIMENSIONS IN INCHES
Neg. 517124
(UNCLASSIFIED)
Figure 5-15. Fuze, MT, Model CD-17, contour and section views (U).
Arming during handling and transportation is prevented by means of a scaled arming
wire (17), which has to be replaced by another wire prior to bomb insertion. The fuze may
be set for 5 to 90 seconds by loosening the knurled head set screw (6) and rotating the
setting dial to desired time of flight.
Upon bomb release, the wire replacing the arming wire (17) must be removed to release
the spring-loaded timing-disk stop pin (14) and nose clamp (15). As the bomb drops, the
arming vanes (2) rotate in the air stream, and the threaded bushing (3) moves down to free
the safety block (1). With safety block drop off, the spring-loaded firing pin (12) is armed.
5-47
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, MT, Model CD-17
FOM No. 1390-17-3-1
(U) Functioning (Continued)
The fixed pinion (5) and gear (4) on the threaded bushing act as stops so that the bushing
will not rotate with the arming vanes. At completion of arming, gear (4) is no longer
engaged with the fixed pinon; therefore, the bushing (3) rotates freely with the arming
vanes. The disengaged gear prevents disarming once arming is accomplished.
Time delay is achieved by the mainspnng (10) dnven movement with runaway
escapement (11). With the pin stop (14) removed, the timing disk (9) rotates until the
prescribed time is reached. A segment (8) then drops into the slot in the timing disk. This
releases another segment (16), which releases the firing-pin decent pin (7). The detent pin
(7) then moves out, and the spring-loaded firing pin (12) is released, stabbing the booster
(13) and initiating the photo flash bomb.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
150-lb photo flash bombs;
500-lb cluster bombs
Fighter bombers or bombers.
5-48
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, MTSQ, Model 544 (Dixi)
FOM No. 1390-18-1-8
Neg. 507934 (UNCLASSIFIED)
Figure 5-16. Fuze, MTSQ, Model 544,
full view (U).
(U) Description
The Dixi MTSQ fuze, Model 554 (fig 5-16), was designed to be used primiarly in US
105-mm howitzer ammunition. The fuze is bore safe inasmuch as it is unarmed until it
reaches maximum rotational velocity at the muzzle of the weapon. Grooves in the nose and
body permit the fuze to be set in a fuze setter. Settings can be read to 0.2 second.
(U) Unique Features
Dixi Will modify this fuze to accommodate gravitational forces ranging from a low of
3,000 r/min to a high of 40,000 r/min to satisfy customer requirements.
5-49
UNCLASSIFIED
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, MTSQ, Model 544 (OW)
FOM No. 1390-18-1-8
(U) Characteristics
Fuze assembly:
Body material Brass w/aluminum base
Weight 0.65 kg
Markings 544
Booster:
Body material
Body length
Ex plosive
Explosive weight
Functional data:
Arming method Setback & spin
Firing method Time/impact
Safety devices Spin-freed firing pin
Arming distance 7
Arming time 0.2 s for SQ
Variable time 3 to 75 s
Delay time none
5-50
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UNCLASSIFIED
Original
(U) Functioning (fig 5-17)
Neg. 507935
24 DIAM
I? DIAM
14 TRI
ALL DIMENSIONS IN INCHES
AST-1160H-001-75
Fuze, MTSQ, Model 544 (Dixi)
FOM No. 1390-18-1-8
(UNCLASSIFIED)
Figure 5-17. Fuze, MTSQ, Model 544, section view (U).
To set the fuze, the nose (1) and the escapement housing (7) that are fixed on the
grooved base (10) in which the driving balls (11) are housed form a unit that is rotated in
respect to the body (18). When the nose is turned right or left, the distance between the
notch on the timing disk (12) and the trigger (13) is changed. The setting indicated on the
nose corresponds directly with the time that the disk needs to travel until the trigger falls
into the notch of the timing disk. On firing, inertia causes the setback weight (5) to press
against the locking pins (8), which fit into a recess between the body and the grooved base.
At the same time, the escapement lock (6) is moved rearward, unlocking the movement.
Spin causes the escapement lock to tip the side, preventing its return when acceleration
5-51
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, MTSQ, Model 544 (Dixi)
FOM No. 1390-18-1-8
(U) Functioning (Continued)
ceases. When acceleration ceases, the mechanism is driven by the driving balls. At the end of
the set time, the notch of the timing disk readies the place where the point of the triKer,
driven by spin enters the notch. This action unlocks the detonator housing (15), which
moves outward under the effect of spin. This motion drives the detonator (16) against the
firing pin (14), initiating the round.
During both transportation and the first few seconds of flight, the PD firing pin (2) is
blocked from the primer (4) by the washer (3). At the end of the designated time, the
movement unlocks the firing pin, arming the fuze. On impact of the projectile, the firing pin
is driven into the primer, initiating the relay, which is contained in the housing (17).
(U) Applications (Arnmunition and Weapons)
Ammunition
Weapons
105-mm HE cartridge
US M101/M101A1 howitzers,
Italian 105-mm pack howitzer, Model M14
5-52
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UNCLASSIFIED
Original
(U) Description
AST-116011-001-M
Fuze, MTSQ, 30 second (Tavaro)
FOM No. 1390-18-1-16
The Tavaro MTSQ fuze was designed to be fired with high-explosive projectiles from
90-mm antiaircraft guns. It can be set in 0.2-second increments to function from 1 to 30
seconds after finng. Safety during handling is achieved by means of pin-activated detents on
the clock escapement mechanism. This fuze is similar to the US M43A5 fuze.
(U) Characteristics
Fuze Assembly:
Body material Steel
Weight 0.60 kg (1.32 lb)
Markings Does not apply
Booster:
Body material
Body length
Explosive
Explosive weight
Functional data:
Arming method
Firing method
Safety devices
Arming distance
Arming time
Variable time
Delay time
Does not apply
Does not apply
Does not apply
Does not apply
Setback & spin
Time/impact
Spin-activated detents
Does not apply
Does not apply
1 to 30 s
None
5-53
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UNCLASSIFIED
AST-1160H-001-75
Fuze, MTSQ, 30 second (Tavaro)
FOM No. 1390-184-16
(U) Functioning (fig 5-18)
A
o
,RPIIIF ?
kkit A
a
te-=-Ny Le.
Trys,
1 r i bi4
A- fit
' f t it AIM AVM Nk
i '-.11k ?jislatm?'4
1 OK !Easacih
- la ?gnu
&ism
lining
r I _vie
9, a-.
alirj
-swam
Original
Neg. 507943
ALL DIMENSIONS
IN INCHFc
(UNCLASSIFIED
Figure 5-18. Fun, MTSQ (Tavaro), contour and section views (U).
Upon firing, centrifugal force moves the rack (3) outward, freeing the upper plunger
(2) for impact action. Friction in the rack-and-pinion system retards the rack's motion. If
impact should occur before the timing device has freed the lower plunger (10), the upper
plunger will fire the detonator (5). The shock wave from the detonator follows a free path
around the timer to set off the primer (14).
5-54
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, MTSQ, 30 second (Tavaro)
FOM No. 1390-18-1-16
(U) Functioning (Continued)
The MT function is provided by a mainspring-driven clock mechanism (9) that
incorporates a cylindrical pallet and torsion bar escapement system. The fuze is set to the
desired time by rotating the nose (1). Torsion-spring action provides constant setting torque.
During setting, the timing cup of the clock mechanism rotates with the center section (4)
and the nose. Upon firing, setback causes the weight (6) to shear off the pin (17) and drive
the locking pin (18) into the fuze body (20). The set position of the fuze is then fixed. The
mainspring, regulated by the timing mechanism, drives the timing cup. The stop (13)
prevents the timing-cup pin from rotating. After setting, the stop is no longer an obstacle.
Setback causes the weight (11) to move back and rotate the timing-cup pin clear. The
spin-activated detents on the escapement are now liberated. As time elapses, the timing cup
rotates to set the location where the segment (19) moves into the opening in the timing cup
under centrifugal force; thus freeing the lower plunger (10). The spring-loaded plunger then
ignites the primer. The segment (16) rotates with the opening during setting, thus preventing
the segment (19) from moving out before the set time.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
90-mm HE projectile ?
90-mm AA guns
5-55
(Reverse Blank)
UNCLASSIFIED
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CONFIDENTIAL
OrirOnel
Neg. 517
?It
C) Description
AST-1160H-001-75
Fuze, MT, Model STIDR M/70, URVgrk
FOM No. 1390481 19
(UNCLASSIFIED)
Figure 5-19. Fuze, MT, Model STIDR M/70, URVgrk (U).
The M/70 MT fuze (fig 5-19) was developed by Forenacle Fabriksverken of Eskitsruna,
Sweden, for use with smoke and illumination mortar projectiles. It employs a 60-second
timer developed by Thiel of Sweden, The fuze is graduated in 0.5-second increments and is
reportedly accurate up to a ?03 second.
It employs three safeties to preclude early start of the clockwork. Upon elapse of the
time setting, a firing pin initiates a percussion cap, setting off a 10-gram (0.022-lb) black
powder expelling charge, Exact design details are not known at this time.
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CONFIDENTIAL
(This page is UNCLASSIFIED)
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Original
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CONFIDENTIAL
Original
CLOSING DISK
(WINDSHIELD)
AST-1160H-001-75
Fuze, MTSQ, Model No. 213 Mk 5
FOM No. 1390-35-1-6
DETONATOR ?
(5 7 GR AZ)
HAND RACE
HAND -
).? Z 0" DIAM ?4
(14 Threads Per Inch)
TENSIONING SCREWS (3)
DETONATOR HOLDER (LOWER) -
--SAFETY CAP
STRIKER HEAD
NEEDLE
STRIKER CUP
_ HEAD
DETONATOR HOLDER (UPPER)
PELLET HOLDER
- POWDER PELLET
)- LOCKING WEIGHT
SHEAR WIRE (31
LOCKING PIN (3)
-DOME
DETONATOR (5 7. GR. AZ)
SHUTTER
RETAINING SCREW
STEMMED C E.
BOTTOM CAP
UNARMED
TENSIONING RING
BODY
TIME MECHANISM
-- DOWEL PIN
MAGAZINE
SECURING RING
BOXCLOTH DISC
? ? C E. PELLET
PAPER TABLET
SHUTTER
SPRING --
SHUTTER UNARMED
ON FIRING
Neg. 552520
SHUTTER ARMED
ON IMPACT
(CONFIDENTIAL)
Figure 5-20. Fuze, MTSQ, Model No. 213 Mk 5, full and section views (U).
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AST-1160H-001-75 Original
Fuze, MTSQ, Model No. 213 Mk 5
FOM No. 1390-35-1-6
(C) Description
The Mk 5 No. 213 fuze (fig 5-20) is an MT fuze with a backup impact function. It
employs an 80-second time mechanism (FOM No. 1390-35-10-1). (See section VIII for
detailed description.) This fuze was designed by the United Kingdom for use with
high-explosive and color bursting artillery projectiles.
(C) Characteristics
Fuze assembly
Body material Steel or brass
Weight
Markings 213 Mk 5
Max length 4.875 in (123.8 mm)
Thread diam 2.00 in (50.8 mm)
TPI 14
Booster:
Body material
Body length
Explosive
Explosive weight
Functional data:
Arming method
Firing method
Safety devices
Arming distance
Arming time
(C) Design Details (fig 5-20)
Brass
2
Tetryl
7
Setback & centrifugally armed
Time & impact
Safety cap & out-of-line detonator
7
7
General. The Mk 5 No. 213 fuze is fitted with a mechanical timing mechanism which
is operated by a mainspring and controlled by an escapement. The time of bursting of the
shell can be varied to actuate between 0 and 80 seconds after the gun is fired. The upper
part of the fuze is arranged for direct percussion action on impact. The fuze consists
principally of a body, dome, head, locking weight, striker head with needle, detonator
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Original AST-1160H-001-75
Fuze, MTSQ, Model No. 213 Mk 5
FOM No. 1390-35-1-6
(C) Design Details (Continued)
holders (upper and lower), pellet holder, shutter, magazine and cap, tensioning ring, timing
mechanism (80 seconds) No. 1A, and a safety cap. The exterior of the body is threaded at
the bottom to 2-inch diameter (14 TPI, right hand) to screw into the nose of the shell. The
top of the body is enlarged and shaped to conform to the contour of the shell: this contour
is maintained by the dome and lower portion of the head of the fuze; the upper portion of
the head is shaped to the same contour as the No. 117 and 119 (b) (cap off) fuzes.
A platform divides the interior of the body. The upper part contains the movement, a
recess in the underside of the platform takes the lower detonator holder, and the bottom
part contains the shutter and magazine.
A brass dome covers the top of the clock and can be rotated in the fuze body. The
dome is retained by a spring-tensioning ring which fits in an internal groove near the foot of
the dome. Inside the head of the fuze is a locking weight. On firing, the setback of this
weight breaks the shear wires and drives the locking pins downward. The locking pins cut
through the upper edge of the body surrounding the time mechanism, thus locking the
dome in the position in which it has been set. Beneath the locking weight is a platform or
hand race, across which a shaped slot is cut. Rotation of the dome positions the slot and
thereby sets the fuze.
The clockwork mechanism rotates a spring-loaded hand beneath the hand race; it is
driven by a mainspring and controlled by an escapement through a train of gear wheels. The
clock work mechanism is started by firing the gun, the hand being released for rotation by
the setback of a trigger.
Clockwork mechanism. The clock Is assembled as a complete unit and fixed to the
top of the platform in the fuze body. The "Mechanism, time, 80 seconds, No. 1A" is
described in section VIII.
Head. The head, made of an aluminum alloy, is shaped to fit the contour of the fuze
dome into which it screws. The top is threaded externally to accommodate the safety cap.
Internally, it is bored from the bottom to accommodate the locking weight, a pellet holder,
and, on a smaller diameter, to accommodate the upper detonator holder. From the top it is
bored to accommodate the striker cup and striker head with needle (firing pin). After
assembly of the striker, the recess in the top of the head is closed by a closing disk and
washer which are secured by turning over a lip formed in the top of the head.
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AST-1160H-001-75 Original
Fuze, MTSQ, Model No. 213 Mk 5
FOM No. 1390-35-1-6
(C) Design Details (Continued)
Body. The body, made of brass or steel, is formed with a shoulder, below which it is
threaded to 2-inch diameter [14 threads per inch (TPI), right hand] to fit the fuze hole of
the shell. Above the shoulder is an inclined surface graduated "0" to "80" and engraved in
black with an arrow head and the word "SAFE" and filled in with red in the ungraduated
space between the figures "80" and "0". Internally, the upper body contains the clockwork
mechanism, below which is the lower detonator holder. A slot in the top of the magazine
houses a movable shutter retained in the unarmed or safe position by a steel spring.
Striker. The striker consists of a steel striker head and needle. The needle formed with
a flange, seats in a recess formed in the striker head and is secured by turning over a lip. The
striker is held from the upper percussion detonator by a striker cup through which the
needle protrudes.
Detonator holder. (Upper). This is a cylindrical aluminum alloy holder with a flange
formed at the base. Internally, the top is recessed to take a varnished 5.5-gr (0.36-gram)
"LZ" detonator (QX 216 AF); below this it is bored to form a flash channel. It is inserted in
the fuze head from underneath, with the detonator immediately beneath the striker needle.
Detonator holder. (Lower). This is assembled off center on the underside of the
platform above the sliding shutter. The brass holder is recessed to accommodate a 5.5-gr
(0.36-gram) "LZ" detonator, which is secured in position by burring over a lip formed on
the holder. A hole is bored through the bottom of the detonator recess to permit the flash
from the detonator to pass to the oblique channel in the shutter when in the armed
position.
Pellet holder. The cylindrical pellet holder is made of aluminum alloy. Externally, it is
threaded at the top, and a hole is formed in the base. It contains a perforated black power
pellet. It is assembled in the head below the flange on the detonator holder (upper).
Shutter (i.e., slider). The brass shutter slides in a slot on top of the magazine (i.e.,
booster). At one end is an oblique channel filled with tetryl. A small hole in the side takes
the end of a steel shutter spring, which pivots on a dowel pin and keeps the shutter at the
center in the unarmed or safe position. In this position the oblique channel is clear of both
the detonator and magazine channel.
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Original AST-1 1MO-001-75
Fuze, MTSQ, Model No. 213 Mk 5
FOM No. 1390-35-1-6
(C) Design Details (Continued)
When the shell is in flight, centrifugal force overcomes the spring and pulls the shutter
outward to the open or armed position. In this position the lower detonator, shutter
channel, and magazine channel are all in alignment.
Detonators. The upper detonator is a 5.5-gr (0.36-gram) "LZ" percussion detonator
in a lugless, tinned, copper-alloy cup. The disk is varnished and colored blue for
identification purposes. The lower detonator is a 5.5-gr(0.36-gram)"LZ" time detonator in
a lugless, tinned, copper-alloy cup. It differs from the upper detonator in that the disk is
NOT varnished and it is colored red.
Magazine (i.e., booster) securing ring. This is a brass collar threaded on the outside to
enter the fuze body from underneath. It surrounds the magazine and secures it by bearing
on the undersurface of the flange formed on the upper part of the magazine. The ring is
secured by a No. 2 BA steel set screw inserted from the side of the threaded portion near
the bottom of the fuze body. Four slots at the bottom are for an assembly cool.
Magazine (i.e., booster). The magazine is made of brass and threaded externally at the
bottom to take a bottom cap. It is bored from the underside to form a recess to take a terryl
pellet sealed by a box-cloth disk, and retained in position by the bottom cap. A flange is
formed towards the top of the magazine, the undersurface of which forms a bearing for the
magazine securing ring. The top forms a platform for the shutter assembly. A slot across the
top accommodates the sliding shutter. A dowel pin in the recess forms a pivot for the
shutter spring, and another positions the magazine to the fuze body platform. A small
channel off center, with a diaphragm of metal left at the top, leads from the shutter slot to
the recess in the magazine. It is filled with tetryl. The magazine is held in position by the
magazine securing ring.
Magazine cap (QX 1599). Made of lead-free brass designed to withstand the required
closing torque, the magazine cap is internally threaded. It screws over the bottom of the
magazine and retains the tetryl pellet and box-cloth disk in position. After filling the
magazine, the cap is screwed on and then crimped in two or more equidistant-spaced places
to prevent it unscrewing.
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AST-1160H-001-75 Original
Fuze, MTSQ, Model No. 213 Mk 5
FOM No. 1390-35-1-6
(C) Design Details (Continued)
Safety cap. Made of steel or malleable cast iron, the safety cap is dome shaped with a
flattened top and a flat steel spnng riveted into an oblique slot on one side. The free end of
the spring engages in the milling on the fuze head and retains the cap in position. The cap is
formed with a milled ring around its circumference and is internally threaded at its lower
end for engagement with the threads formed on top of the fuze head. The cap is painted or
lacquered black externally.
Tin-plating. Some components are tin-plated to overcome possible deterioration of
the fuze during storage and thus improve its safety. The components so treated are
magazine, body (internal), detonator holders, shutter, and striker cup.
(C) Safety
? The safety cap protects the windshield and striker head during storage and
transit.
? When the fuze is set at SAFE, the hand race in the dome is coincident
with the hand that is prevented from rising by the muzzle safety device
bridge.
? The tensioning ring prevents the dome being accidentally moved during
storage and transit.
? Three equidistant-spaced shear wires secure the locking weight to the wall
of the head, preventing movement of the locking weight before firing.
? When in the unarmed position, the shutter masks off the stemmed tetryl
in the magazine channel and prevents a prematurely fired lower detonator
from initiating the tetryl pellet in the magazine.
? The tngger prevents the hand from rotating and the time mechanism from
starting until the gun is fired.
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Original AST-1160H-001-76
Fuze, MTSQ, Model No. 213 Mk 5
FOM No. 1390-35-1-6
(C) Safety (Continued)
? The centrifugal safety catch is housed under the striker cam until the shell
rotates in flight. It serves a dual purpose:
(1) In the event of the clockwork mechanism being set in action
accidentally the catch prevents the striker reaching the detonator.
(2) If a fuze with the clockwork mechanism accidentally set in action
were loaded and the gun fired, the centrifugal safety catch would be
prevented from swinging out from under the cam as the latter would,
immediately as the hand is lifted, jam down on to a step cut in the
catch for this purpose.
? The muzzle safety bridge prevents the hand rising until the shell is well
clear of the muzzle. This device operates if the fuze is set too short.
(C) Functioning
Prior to loading, the fuze is set to the time required, and the safety cap is removed.
Timing mechanism operation:
On firing. The locking weight in the head sets back, shearing the copper pins and
forcing the locking pins downward. The pins cut through the top lip in the body and enter
the recess formed in the dome. This locks dome and body together and prevents movement
from the time set position. The trigger sets back and the trigger locking bolt is forced
outward by its spring to retain the trigger. The hand is now released from the trigger, but
prevented from rising by the muzzle safety device bridge. During acceleration in the bore, it
is unlikely that the pellet will oscillate owing to the force of the setback. When the muzzle is
reached, the hand begains to rotate in a counter-clockwise direction by the action of the
mainspring. When acceleration ceases, the centrifugal safety catch flies outward, due to
centrifugal force, and leaves the striker supported by its cam resting on the pillar.
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AST-1160H-001-75 Original
Fuze, MTSQ, Model No. 213 Mk 5
FOM No. 1390-35-1-6
(C) Functioning (Continued)
During flight. The shutter moves outward against its springs, by centrifugal force,
bringing the fire channel coincident with the lower detonator and the channel leading to the
magazine. When the clockwork mechanism has run the prescribed time according to the
setting, the hand has been brought immediately under the slots in the hand race and rises
under the influence of its spring to release the lever that controls the striker. The release of
the lever allows the spring to rotate the cam off the pillar and force the striker down on the
detonator. The striker is forced by its spring into the detonator, which fires. The flash passes
through the stemmed tetryl channel in the shutter to the tetryl pellet in the magazine.
Percussion arrangement:
On firing. The acceleration of the shell in the bore causes the shutter to set back and
set up sufficient frictions in its recess to retain the shutter in the unarmed position while the
shell is in the bore.
During flight. When acceleration ceases, the shutter moves forward by momentum
and outward by centrifugal force, to bring its fire channel in alignment with the lower
detonator and the channel to the magazine.
On impact. The cap having been removed before loading, the striker head is crushed
in and the needle pierces and fires the upper detonator. The resultant wave ignites the
gunpowder pellet, the flash from which passes through the dome and fuze body to detonate
the lower (time) detonator. The subsequent action is described under "Timing Mechanism."
(C) Applications (Ammunition and Weapons)
Ammunition
Weapons
HE and color-bursting
projectiles
25-pounder gun, 5.5-in gun,
and 7.2-in howitzer
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Original
COVER
CAP
MECHANISM SLEEVE
DETONATOR
HOLDER N
DETONATOR
(1 93 GR BP/ -
SPRING
0 705
LT__
2 00" DIAM
(14 Threads per Inch)
SET SCREW
TOP RING ?
BOTTOM RING ?
BODY --
AST-1160H-001-75
Fuze, Time, Model No. 390 Mk 1
FOM No. 1390-35-1-29
FUNCTION OF TIME RINGS
TOP RING
MECHANISM
SLEEVE PLUG
CLOTH DISK
BOTTOM RING
FUZE POWDER
SECURING PIN
NEEDLE
CLOTH
WASHERS
NEEDLE
MAGAZINE RING -. PELLET
POWDER'
MAGAZINE...._. PELLETS
BASE PLUG ? CLOSING
DISK
Neg. 552521
(C) Description
UNARMED
ON FIRING
(CONFIDENTIAL)
Figure 5-21. Fuze, time, Model No. 390 Mk 1, full and
section views (U).
The UK No. 390 Mk 1 fuze (fig 5-21) was designed for base-ejection smoke projectiles
fired from mortars and field guns. It is a pyrotechnic time train fuze with a top and bottom
ring designed to give a burning time between 0 and 23 seconds time of flight. The haze has a
cover secured by a wire that has to be removed prior to setting the fuze to the desired time
of flight.
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AST-116011-001-75 Original
Fuze, Time, Model No. 390 Mk 1
FOM No. 1390-35-1-29
(C) Characteristics
Fuze assembly:
Body material Brass
Weight
Markings 390 Mk 1
Length 4.90 in (12.416 mm)
Expelling charge magazine:
Body material
Body length
Explosive Black powder
Explosive weight
Functional data:
Arming method Setback
Firing method Setback
Safety devices
(C) Design details (fig 5-21)
General. The Mk 1 No. 390 fuze consists principally of a body, base plug, needle,
spring, detonator-holder, mechanism sleeve and plug, magazine ring, detonator, bottom ring,
top ring, cap, and cover.
Body. The body is made of brass. The main feature of the body is the platform,
below which it is reduced in diameter and threaded 14 TI'] right handed to fit a
2-inch-diameter hole. A stepped shoulder may or may not be formed on the lower edge of
the platform. Above the platform, the body is formed with a stern, which is reduced in
diameter at the upper end and threaded externally to receive a cap. Thc side of the platform
is bevelled and graduated in quarter divisions for almost its entire circumference, the
divisions reading from 0 to 30. At the center of the ungraduated portion, between the
figures 30 and 0, is engraved a setting mark (a red arrowhead) below which appears the word
"SAFE." The graduations are read in conjunction with a line engraved on the bottom ring;
when the fuze is set at "safe," the setting mark engraved on the bottom ring coincides with
When fine is set on safe, the ridges of the upper and lower tune rings provide a mechanical block of the flash holes
between the lower ring and the black powder expelling charge.
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Original AST-116014001-75
Fuze, Time, Model No. 390 Mk 1
FOM No. 1390-35-1-29
(C) Design Details. (Continued)
the arrowhead. A hole is bored in the side of the platform for use with a fixing key. The
stem is bored centrally from the top to receive the needle, spring and mechanism sleeve, and
the detonator-holder and its detonator. Two oblique flash channels lead from the center
bore (Le., the detonator channel) to the top time ring to allow the flame and gas from the
detonator to circulate in the fuze body, thus ensuring less violent ignition of the time ring.
The lower end of the body is bored and recessed to form a magazine and prepared with
threads to receive a base plug; a short oblique and vertical channel, containing perforated
powder pellets, connects the magazine with the top surface of the flange. The magazine is
filled with not less then 80 grains of G.20 gunpowder. A wooden, plastic, or compressed
paper ring fitted over a boss formed on the body inside the magazine recess serves to reduce
the weight and also the capacity.
Base plug. The base plug is made of either brass or zinc-alloy. It is dished on the inner
surface and has a flash hole drilled in the center which is closed by a thin brass disk to which
a paper disk is affixed with shellac. The plug is screwed into the base of the body and retains
the gunpowder charge in the magazine recess, the base of the fuze being sealed with shellac
varnish colored red.
Needle. The steel needle (i.e., firing pin) is formed with an enlarged head, which acts
as a needle pellet, and a long shank. The upper end of the shank is pointed to pierce the
detonator. When assembled, it is housed in the center of the body.
Spring. This is a spiral of 15 coils of 0.02-inch (0.51 mm) circular section steel wire. It
is assembled between the base of the detonator-holder and the head of the needle and
surrounds the needle shank.
Detonator holder. The brass detonator holder is bored vertically and prepared to
house the detonator.
Mechanism sleeve. The brass mechanism sleeve is in the shape of a cylindrical tube. It
is threaded externally at its lower end to screw into the top of the stem formed on the fuze
body and threaded internally at the other end to accept the mechanism sleeve plug.
Mechanism sleeve plug. The brass mechanism sleeve plug is formed with a flange,
below which it is screw-threaded to engage in the top of the mechanism sleeve. A cloth disk
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AST-1160H-001-75
Fuze, Time, Model No. 390 Mk 1
FOM No. 1390-35-1-29
(C) Design Details (Continued)
Original
is shellacked to its inner face, and a screwdriver slot is formed in the head to facilitate
insertion. It is screwed into the upper end of the sleeve where it retains the detonator-holder
with its detonator, spring, and needle in position. The spring, being in initial compression,
prevents the detonator-holder from setting back and the needle from moving forward until
the gun is fired.
Magazine ring. The magazine ring is a shaped ring of either wood, plastic, or
compressed paper. It is inserted and positioned over a boss formed in the magazine portion
of the body.
Detonator. The "BP" detonator weighs 1.93 grains (0.13 grams) and is assembled in
the base of the detonator-holder.
Bottom ring. The brass bottom ring is bevelled externally to conform to the shape of
the flange of the fuze body. It has a concentric groove, filled with composition SR.227,
pressed in and covered by a paper disk washer extending nearly all around its undersurface.
A small recess is bored in the top surface and houses a perforated powder pellet. This recess,
coincident with the beginning of the groove, is connected to the latter by an oblique
channel. A gas escape hole, with an oval, aluminum-alloy sealing disk, is formed in the side
of the ring. The ring has setting slots for engagement by a fuze-setting key, and a "setting"
line is engraved for reading against the graduations on the flange of the fuze body. It is
assembled over the stem of the body on which it is free to rotate, for setting purposes.
Top ring. The brass top ring is similar to the bottom ring, but the external
circumference is slightly smaller. The oblique channel is filled with pressed-in meal powder
and connects the concentnc groove with the port in the stem of the film body when the
ring is assembled in position. A gas escape hole, containing a gunpowder pellet retained by
an oval, brass sealing disk, is formed in the side of the nng and also connects with the
concentric groove and the oblique channel filled with the mealed powder. The concentric
groove is filled with fuze powder SR 227 and covered by a paper washer shellacked over the
base. Setting slots, for use in conjunction with those in the bottom ring, are cut in the
periphery. The ring is assembled over the stem of the fuze body and on top of the bottom
ring; it is prevented from rotating by a brass pin which fits coincident recesses prepared in
the ring and stem.
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Original AST-1160H-001-75
Fuze, Time, Model No. 390 Mk 1
FOM No. 1390-35-1-29
(C) Design Details (Continued)
Cap. The cone-shaped cap is made of aluminum alloy. Internally, at the base, it is
screw-threaded for assembly over the stem formed on the fuze body. Two holes are drilled
radially in the sides to facilitate assembly. After the cap is screwed onto the fuze body, and
the fuze is tensioned at 450 -?50 inch-ounces, a hole is drilled through into the stem, the
inner portion of the hole in the cap being threaded. A set screw is then inserted and screwed
home, the recess behind the screw being sealed with waterproofing composition.
Cover. At the time of issue, a 2-inch cover (50.8 mm), time or time and percussion
fuze No. 5, is assembled to the fuze. Made of brass and conical in shape, it is fitted with a
rounded rubber ring at its lower end, the cover and ring being clamped to the fuze body by
a securing band. The band fits under the platform of the body and is pressed tightly around
and the ends secured by copper wire; the ends of the wire are twisted and tucked under the
band. Alternatively, the cover may be held in position by a securing band secured by a
tongue engaging in a slot, the tongue being turned over. A hole in the band coincides with
one of the tommy holes in the body of the fuze. When issued, the cover is hermetically
sealed.
Waterproofing. The joints between the time rings, body and between ring and top
cap, escape hole disks, and the set screw in the cap are sealed with Mark 8 Luting.
Washers - time rings. Cloth, all wool, melton finish washers are affixed to the upper
surface of the platform and of the bottom time ring to ensure a tight joint when assembled
and also to prevent any flash-over.
Washer for joint between shell and fuze. In the case of fuzes manufactured without a
stepped shoulder formed on the fuze body, a brass or tin-plate washer 2.3 inches in diameter
is placed under the flange of the fuze body before the fuze is assembled in the shell. This is
to prevent pinching the securing band between the flange of the fuze and the lip of the shell,
which would make removal difficult.
(C) Safety
? Initial compression of needle spring keeps the detonator clear of the
needle.
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AST-1160H-001-75
Fuze, Time, Model No. 390 Mk 1
FOM No. 1390-35-1-29
(C) Safety (Continued)
? When the fuze is set at safe, the flash holes in the lower time ring and to
the magazine are blocked by the ridges of the upper and lower time rings,
respectively. This provides a double safety device against ignition of the
magazine, should the initiating mechanism (i.e., detonator) function
prematurely.
(C) Preparation for Firing
Original
The cover must remain on the fuze until immediately before firing, when it is removed
by using pliers on the securing wire or tongue of the cover band. The cover should then be
eased off the fuze with a screwdriver. The fuze is then set to the required graduation on the
body by rotating the setting mark on the bottom ring.
(C) Functioning
On firing. The detonator sets back on the needle, compressing the spring. The
detonator is detonated, and the flash passes through the flash channels in the stem of the
body and ignites the mealed powder in the oblique channel in the top ring. This, in turn,
ignites the fuze composition, which blows out the closing disk in the gas-escape hole and
thus provides a vent for the gases generated as the burning of the time train progresses.
During flight. The composition in the top ring burns around until, after an interval of
time determined by the setting, the flame reaches the powder pellet in the bottom ring; the
pellet is fired and ignites the composition in the bottom ring, which blows out the closing
disk in the gas escape hole. The composition in the bottom ring burns around in the reverse
direction until, after an interval of time determined by the setting, the flame reaches the
powder pellet in the vertical portion of the channel in the body of the fuze which is fired
and ignites the pellet in the oblique channel and, in turn, the powder in the magazine. The
powder in the magazine explodes, blows out the brass disk in the base plug and the resultant
flame passes through to ignite the bunting charge in the head of the shell.
(C) Summary of Differences
? Body. A stepped shoulder will always be formed on the underside of the
platform of this fuze. A washed 2.3-inch (58.4-mm) diameter is therefore
not required when fitting this fuze to a mortar bomb.
5-72
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CONFIDENTIAL
Original AST-1160H-001-75
Fuze, Time, Model No. 390 Mk 1
FOM No. 1390-35-1-29
(C) Summary of Differences (Continued)
? Bottom time ring. This fuze is filled with RD 202 instead of SR 227,
making this fuze a 46-second fuze; the circular gas escape hole is sealed
with an aluminum disk.
? Cap. Tensioned at 750 ?-50 inch-ounces before being secured.
(C) Notes
Prior to mid-1949, to distinguish them from Mk 1 No. 390 fuzes, the bottom rings of
Mk 2 and 2A fuzes were painted or lacquered red to denote that they were filled with
slow-burning composition; after that date, this identification was dispensed with.
Approval has been given for all marks of fuze, other than those manufactured with a
stepped shoulder, to have a brass or tinned-plate 2.3-inch (58.4-mm) diameter washer
(QX/88) assembled, at the time of production, under the flange of the fuze to prevent
pinching the securing band between the flange of the fuze and the lip of the projectile, thus
making removal difficult. This washer was never introduced as a separately demandable item
of supply.
(C) Applications (Ammunition and Weapons)
Ammunition
Weapons
BE smoke shell or mortar bomb
Mk 1 for QF 20-pounder gun,
Mk 2 and 2A for 3-in ML mortar
5-73
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AST-1160H-001-75 Original
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5-74
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CONFIDENTIAL
Original
Neg. 516420
BASE
FUZE
AST 60H-001-75
Fuze, Time, Model
FOM No. 1390-3714
FUZE
ADAPTER
FLAY HOUSING
FUZE HOUSING
RELAY (2!
5-22. Fuze, time, Model P. exploded
and 52-mm p (U).
5-75
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(CONFIDENTIAL)
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CONFIDENTIAL
AST-1160H-001-75 Original
Fuze, Time, Model?
FOM No. 1390-37-14
(C) Description
The Israeli pyrotechnic time fuze is a base-delay type designed to initiate the black
powder expelling charge of 52-mm illuminating mortar projectiles. It consists of the fuze
adapter, delay housing, and fuze housing.
(C) Unique Features
Uses hot gases during firing to initiate two relay elements (dualized for reliability) that
in turn initiates the pyrotechnic delay.
(C) Characteristics
Fuze adapter:
Length 1.06 in (26.9 mm)
Max diam 1.80 in (45.7 mm)
Thread diam 1.19 in (30.2 mm)
TPI 16
Fuze housing:
Material Steel
Length 1.93 in (49.0 mm)
Max diam 1.66 in (42.2 mm) -
Thread diam 0.49 in (12.0 mm)
TPI 16
Delay holder housing:
Length 1.05 in (26.7 mm)
Max diam 0.63 in (16.0 mm)
Thread diam 0.50 in (12.7 mm)
TPI 20
Ex plosive Black powder ?
Relay elements:
No 2
Ty pe Heat sensitive
Explosive Black powder ?
5-76
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CONFIDENTIAL
Original
(C) Characteristics (Continued)
Functional data:
Firing method Hot gases
Safety devices Pyrotechnic delay
Delay time 8.25 s
(C) Functioning
30 DIAM
LSO DIAM
1 22 DIAM
1.66 DIAM
2.50
48 DIAM
0.25 DIAM
0.78 DIAM
0.51 DIAM
Neg. 552572
49 DIAM
16 TPI
ALL DIMENSIONS IN INCHES
AST-1160H-001-75
Fuze, Time, Model?
FOM No. 1390-37-14
Figure 5-23. Fuze, time, Model ?, contour and
section views (U).
(CONFIDENTIAL)
Upon firing, the hot gases generated initiate two relay elements (6) located in the fuze
housing (4). This, in turn, initiates the delay composition (3) contained in the delay housing
(2), which screws into fuze adapter (1). After burning for about 8.25 seconds, the expelling
charge (5) is initiated. The gas generated upon burning propels the illuminant candle and
parachute assembly from the projectile.
5-77
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CONFIDENTIAL
AST-1160H-001-75
Fuze, Time, Model?
FOM No. 1390-37-1-4
(U) Applications (Ammunition and Weapons)
Original
Ammunition
Weapons
52-mm illuminating projectiles
52-mm mortar
5-78
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CONFIDENTIAL
Original
Neg. 516414
AST?1160H-001-75
?Fuze Time, Mode!
[OM No, 139U-374-6
(CONFIDENTIAL)
Figure 5-24, Fuze, time, Model ?, full view with pr
5-79
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CONFIDENTIAL
AST-1160H-001-75 Original
Fuze, Time, Model?
FOM No. 1390-374-6
(C) Description
The Israeli time fuze, Model ? (fig 5-24), was designed for use with 81-mm illuminating
mortar projectiles. It utilizes a black powder time ring. The fuze can be set to provide time
delays of 17.3, 19.2, 20.7, and23.9 seconds, respectively. A safety pin, used to prevent the
firing pin from moving during handling, also locks the time setting cap.
(C) Characteristics
Fuze assembly:
Body material Aluminum
Weight
Length 2.68 in (68 mm)
Time ring material Brass
Time train type Black powder
Time train wt. 0.05 lb (22.7 g)
Expulsion charge type Black powder
Expulsion charge wt. 0.068 lb (30.8 g)
Relay pellets (no.) 2
Relay pellets (type) Black powder
Functional data:
Arming method Setback
Firing method Hot gases
Safety devices Safety pin
Arming distance
Arming time
Delay time 17.3, 19.2, 20.7, and 23.9s
5-80
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CONFIDENTIAL
Original AST-1160H-001-75
(C) Design Details (fig 5-25)
SAFETY PIN
AND
INSTRUCTION TAG
RUBBER
0-RING
BLACK POWDER
RELAYS ;
Fuze, Time, Model?
FOM No. 1390-37-1-6
CI RCLIP
SPRING
LOCKING PIN
PLASTIC FUZE
DELAY-TIME
SETTER
RETAINING PLUG
(11- FIRING PIN
SETBACK SPRING
?
FUZE BODY
STEEL BUSHING
TIME TRAIN RING
SCREWS 3 .:>.....SCREWS
BLACK POWDER - COVER PLATE
RELAY
0 PAPER GASKET
FLAT WASHER
0
EXPELLING CHARGE LOCKING NUT
(BLACK POWDER)
Neg. 516414
ALUMINUM SEAL
410 CLOSING CUP
(CONFIDENTIAL)
Figure 5-25. Fuze, time, Model ?, exploded view (U).
5-81
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CONFIDENTIAL
MT-1160H-001-75 Original
Fuze, Time, Model?
FOM No. 1390-374-6
(C) Design Details (Continued)
The time fuze consists of two major assemblies: a conical-shaped aluminum body and a
brass time train ring. A cylindrical steel insert, counterbored at the top and threaded at the
bottom, is pressed axially through the fuze body. The joint between the fuze body and the
time train ring is sealed with an 0-ring. A closure assembly is threaded into the base of the
time train ring and moisture-proofed with varnish. The fuze body has one vent, which is
sealed with epoxy. A transparent plastic time setting cap covers the fuze body. It locks into
a slot provided and is ribbed longitudinally on the circumference for gripping purposes. A
safety pin prevents movement of the setting cap and firing pin.
(C) Functioning (fig 5-26)
2.68
35
.05
1.20
.25-?
21-
40-
Neg. 552573
50 DIAM
97 DIAM
3.10 DIAM
3.11 DIAM
2.70 DIAM
20 TM
ALL DIMENSIONS IN INCHES
14
13
(CONFIDENTIAL)
Figure 5-26. Fuze, time, Model ?, contour and section views (U).
5-82
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C
Nit U
Original AST-1160H-001-75
Fuze, Time, Model?
FOM No. 1390-37-1-6
(C) Functioning (Continued)
Prior to firing, the plastic time setting cap (13) and fuze body (14) are rotated to align
the arrow (see fig 5-24) on the cap with the selected number on the projectile. The safety
pin (1) and plastic time cap are then removed.
Upon firing, setback forces causes the firing pin (2) to compress-the spring (3) stabbing
the primer (4). The flash from the primer ignites relay pellets (5 and 7) in succession. Heat
from the flash melts the epoxy (6), opening the vent in the fine. The burning relay pellet
(7) then ignites the black powder charge (8) in the time ring (9).
After the time ring charge completes the burning cycle predetermined by the fuze time
setting, it ignites a relay pellet (11) in the time train ring. This, in turn, ignites the black
powder expelling charge (10) for expulsion of the illuminant candle and parachute assembly
of the projectile.
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
81-mm illumination projectiles
81-mm mortar
5-83
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AST-1160H 1-75
5-84
CONFIDENTIAL
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Original
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UNCLASSIFIED
Origins AST-1160H-001-75
PROXIMITY (VT) FUZES
6-1
(Reverse Blank)
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UNCLASSIFIED
Origins AST-1160H-001-75
Section VI.
PROXIMITY (VT) FUZES
GENERAL
(U) Proximity (VT) fuzes have been designed or are under development for artillery,
rocket, mortar, and bomb applications. These fuzes normally operate on the doppler or
infrared principle by proximity sensing of the target; however, in the case of the indirect fire
role, some designs are capacitance operated to provide lower burst and minimize
electro-countermeasure detection.
(U) Some of the earlier fuzes use tube electronics and chemical power, while some of
the later ones are transistorized and in some cases use integrated-circuit chip technology and
are mechanically powered via a turbine generator concept.
(U) Most of the fuze developments included in this handbook require setback or
centrifugal force environmental stimulus for arming; almost all have delayed arming?usually
accomplished by mechanical, electrical, or pyrotechnic means.
(U) Some of the fuzes described in this section surpass the current state-of-the-art of
both tube electronic and chemically-powered fuzes. The fuzes presented in this handbook
arc designed for either high- or low-"g" acceleration and for fin-(nonrotated) and
spin-(rotated) stabilized projectiles or warheads.
(U) Proximity fuzes arc sometimes designated as variable time (VT). Although "VT"
is a misnomer, it has become an accepted term for proximity fuzing.
6-3
(Reverse Blank)
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UNLLASSIFIEU
Original AST-1160H-001-75
INDEX
FOM No. Nomenclature*
Page
1390-17-1-24
Fuze, Proximity, Model FU-RA-Fl
6-7
1390-19-1-4
Fuze, Proximity, Model FFV574
6-9
1390-19-1-5
Fuze, Proximity, Model ZELAR
6-15
1390-19-1-18
Fuze, VT, ZONAR 70 grk-12
6-19
1390-20-1-1
Fuze, Proximity, Type NVT-23
6-21
1390-20-1-2
Fuze, Proximity, Type NVT-26
6-23
1390-20-1-3
Fuze, Proximity, Type NVT-227
6-25
1390-20-1-4
Fuze, Proximity, Type NVT-2
6-27
1390-20-1-5
Fuze, Proximity, Type NVT-224
6-31
1390-20-1-6
Fuze, Proximity, NVT-24
6-33
1390-20-1-7
Fuze, VT, Model PPD327
6-35
1390-29-1-4
Fuze, VT, Model NINA
6-39
1390-37-1-1
Fuze, VT, Model I.P
6-43
*All fuze nomenclatures are UNCLASSIFIED.
6-5
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UNCLASSIFIED
AST-1160H-001-75
LIST OF ILLUSTRATIONS
Figure Title*
Original
Page
6-1
Fuze, proximity, Model FP-RA-F1, full view
6-7
6-2
Fuze, proximity, Model FFV574, full view
6-9
6-3
Fuze, proximity, Model FFV574, section view
6-10
6-4
Fuze, proximity, Model FFV574, S&A device
6-11
6-5
Comparison of HOB of doppler vs. capacitance
fuzing
6-12
6-6
Fuze, proximity, Model ZELAR, full view
6-15
6-7
Fuze, VT, Model ZONAR 70 grk-12, full view
6-19
6-8
Fuze, proximity, Type NVT-23, full view
6-21
6-9
Fuze, proximity, Type NVT-23, section view
6-22
6-10
Fuze, proximity, Type NVT-26, full view
6-23
6-11
Fuze, proximity, Type NV'T-227, section view
6-25
6-12
Fuze, proximity, Type NVT-2, contour and full views
6-27
6-13
Fuze, proximity, Type NVT-2, section view
6-28
6-14
Fuze, VT, Model PPD 327, section and contour views
6-35
6-15
Fuze, VT, Model PPD 327, functioning sequence
6-37
6-16
Fuze, VT, Model I.P., contour view
6-43
6-17
Fuze, VT, Model I.P., exploded view
6-45
6-18
Fuze, VT, Model I.P., firing sequence
6-46
6-19
Fuze, VT, Model I.P., hermetically-scaled container and wooden
box
6-47
*ALE figure titles are UNCLASSIFIED.
6-6
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UNCLASSIFIED
Original
Neg. 516985 (UNCLASS
Figure 64. Fuze, proximity, Model
FU-RA-F1, full view (U).
AST-1160H4001-75
FU-KA-F1
FOM No 1390171-24
.Description
The FUR AF I proximity fuze (fig 6-1) was developed by Telecommunications
Radioelectriques ci Telephonigues (TAT) of Paris for use with French 155-mm,
high-explosive, artillery projectiles, Model 1956. The fuze, which operates on the doppler
principle, is standard for use by the French Army and is intended to increase the lethality of
the French howitzer firepower. The fuze incorporates an hi, radioelcctric head composed of
a detecting oscillator. The receiving element is an If amplifier terminating in a firing circuit.
The fuze is powered by a battery and includes pyrotechnic delayed arming. Fuze
functioning is initiated upon setback during firing.
6-7
(Reverse Blank)
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UNCLASSIFIED
Original AST-116011-001-75
Fuze, Proximity, Model FFV574
FOM No, 139019-14
(UNCLASSIFIED)
ASS ED)
igure 6-2. Fuze, proximity, Model
FFV574, full view (U).
(U) Description
The FFV574 proximity fuze (Fig 6-2) is manufactured by Fdirenade Fabriksverken of
Sweden. It is a transistorized, battery-powered fine used with 75- through 1SOmrn artillery
projec
6-9
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UNCLASSIFIED
AST-1160H-001-75
Fuze, Proximity, Model FFV574
FOM No. 1390-19-1-4
(U) Characteristics
Functional data:
Arming method Setback and centrifugal force
Firing method Impact and proximity
Safety devices S&A
Arming distance
Arming time
Self-destruct time 2
Delay time 0.12 s for impact
0.4 s
(U) Design Details
ANTENNA
ELECTRONIC UNIT
BATTERY
SAFETY AND
ARMING DEVICE
TIMER MECHANISM
ELECTRIC DETONATOR
IMPACT MECHANISM
SLIDER
BOOSTER
(UNCLASSIFIED)
Figure 6-3. Fuze, proximity, Model FFV574,
section view (U).
6-10
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Original
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UNCLASSIFIED
Original AST-1160H-001-75
Fuze, Proximity, Model FFV574
FOM No. 1390-19-1-4
(U) Design Details (Continued)
The FFV574 VT fuze (fig 6-3) consists of an antenna, electronic unit (which includes
an oscillator, frequency detector, amplifier, and noise filter), firing circuit, chemical battery,
and S&A device.
The S&A device, which functions on setback, includes a mechanical timer for delaying
the movement of a spring-loaded slider housing an electric detonator.
Figure 6-4 illustrates the component interface of the timer with the shutter (i.e.,
slider).
DETENT 10
BALL 3
ANCHOR
ELECTRIC
DETONATOR 14
SAFETY
11
PLUNGER
DETENT 10
SHUTTER 0
8 FLYWHEEL
7 ANCHOR WHEEL
6 GEAR WHEEL
4 SEGMENT
5 SEGMENT
2 SAFETY PIN
1 SETBACK PIN
16 DETONATOR
BOLT
15 SPRING
12 SHUTTER SPRINC
(UNCLASSIFIED)
Figure 6-4. Fuze, proximity, Model FFV574, SSA device (U).
6-11
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1
UNCLASSIFIED
AST-116011-001-75 Original
Fuze, Proximity, Model FFV574
FOM No. 1390-19-1-4
(U) Unique Features
The manufacturer claims that the capacitance principle insures a uniform 1-meter
height of burst (HOB) for a wide variety of soil conditions and is relatively impervious to
electronic countermeasures. Figure 6-5 illustrates HOB of dobbler versus capacitance VT
fuzing over different soil conditions.
gt.
CAPACITANCE
5 10 20 40
80
Neg. 518434 (UNCLASSIFIED)
Figure 6-5. Comparison cf HOB of doppler vstapacitance
fuzing (U).
While the 1-meter HOB is less than optimum, it offers a significant improvement over
impact detonation, and the FFV574 fuze is said to be considerably cheaper than
doppler-type proximity fuzes.
6-12
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UNCLASSIFIED
Original
(U) Functioning
AST-1160H-001-75
Fuze, Proximity, Model FFV574
FOM No. 1390-19-1-4
The fuze is capacitance operated. The oscillator is tuned by the capacitance between
the projectile and the isolated fuze "antenna." As the projectile approaches impact, the
effective capacitance between these elements (element-to-ground capacitance) changes very
rapidly, thus detumng the oscillator.
FREQUENCY
NOISE
FIRING
OSCILLATOR
DETECTOR
HAMPLIFIER
FILTER
CIRCUIT
L7141
VARIABLE
CAPACITANCE
TO GROUND
The frequency shift is detected, amplified, and conditioned to provide a trigger signal for
the firing circuits.
6-13
(Reverse Blank)
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FOR OFFICIAL USE ONLY
Original AST-1160H-001-75
Fuze, Proximity, Model ZELAR
FOM No. 1390-19-1-5
Neg. 517470 (UNCLASSIFIED)
Figure 6-6. Fuze, proximity, Model
ZELAR, full view (U).
(U) Description
The ZELAR (fig 6-6) is manufactured by AB Bofors and Phillips AB of Sweden. It is a
transistorized, battery-powered, proximity fuze used with 75- and 155-mm artillery
projectiles.
6-15
FOR OFFICIAL USE ONLY
(This page is UNCLASSIFIED)
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FOR OFFICIAL USE ONLY
AST-1150H-001-75
Fuze, Proximity, Model ZELAR
FOM No. 1390-19-1-5
(U) Unique Features
Original
The ZELAR permits selection of four impact delays and three proximity sensitivity
settings, plus a safe position.
Impact delays
? Position 1 provides a delay not to exceed 200 ms for producing ricochet
bursts.
? Position 2 provides a delay not to exceed 25 ms for penetration of light
Fortifications.
? Position 3 provides SQ functioning with high sensitivity. This feature
would permit surface bursts on snow.
? Position 4 provides a low-sensitivity SQ functioning for use in heavy rain.
Proximity delays
? Position 5 provides a proper burst height for normal soil conditions.
? Positions 6 and 7 provide a proper burst height for very dry and very wet
soil conditions, respectively.
( FOUO) Functioning
The proximity function is based on the doppler principle, powered by a reserve
battery. A loop-type antenna is used, making the proximity function independent of
projectile size.
(U) S&A Features
The battery electrolyte is encased in a glass ampule which is crushed at firing. When the
selector is set at "SAFE," all electrical connections between the electronic assembly and the
pyrotechnic chain are broken and initiation circuitry is short circuited. A spin-dependent
contact prevents power from reaching the ignition circuit before firing. One delayed-arming
6-16
FOR OFFICIAL USE ONLY
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original
(U) S&A Features (Continued)
AST-1160H-001-75
Fuze, Proximity, Model ZELAR
FOM No. 1390-19-1-5
device is not released until the projectile is at least 75 meters from the muzzle. A second
delay prevents initiation of the proximity function until 3 seconds after firing.
(U) Characteristics
Fuze assembly:
Body material
Weight
Markings
900 g (1.98 lb)
Functional data:
Arming method
Firing method
Safety devices
Arming distance
Arming time
Self-destruct time
Delay time
Frequency (for VT fuze
only)
Initial setback
Impact and proximity
Acceleration, rotation, delay
75 m (impact)
3 s (proximity)
Impact
Selectable
6-17
(Reverse Blank)
UNCLASSIFIED
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BLANK PAGE
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
CONFIDENTIAL
Original AST-116011-001-75
Fuze, VT, Model ZONAR 70 grk-12
FOM No. 1390-194-D
(CONFIDENTIAL)
Figure 6-7. Fuze, VT, Model ZONAR
70 grk-12, full view (U).
(C) Description
The ZONAR 70 grk-12 (fig 6-7) was designed by A/S Kongsberg Openfabrik of
Norway for use with the Swedish M58, 120-mm, HE, mortar projectile. The fuze is similar
in design to the Norwegian NVT-24 (FOM No. 1390-20-1-6). The ZONAR 70 operates
mechanically from the time of firing until 1 second has elapsed on the descending leg of the
trajectory; the fuze then operates on the doppler principle In Swedish tests using
high-powered and directional jammers, the ZONAR 70 could be jammed; however, Swedish
planners assume that the enemy is not likely to concentrate jamming signals of the required
magnitude on the battlefield.
6-19
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
CONFIDENTIAL
ASh l6OH-OO175
Fuze, VT, Model Z NAR 70 grk-12
FOM No, 1390-19.118
IC) Description (Continued)
Original
The ?norma c was 4% to a under no.-ja.rnmin conditions, Rep
ZONAR 70 gave a more consistent ROB 0.5 meters at 650 angle of ralb than the EFV574,
capacitance-type, VT fuze. The ZONAR 70 will be used by the Norlands brigades only,
because of deep snow country.
6-20
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original
ription
AST 01-75
Fuze, Proximity, Type NVT-23
FOM No. 1390-2041
(UNCL, MED)
Figure 6,9. Fuze, proximity Type NVT-23,
full view (U
The NVT-23 (fig 6-8), which is manufactured by Kongsberg Vapcn
a specific development uf the NVT-2 prototype, self-powered, proxirnt
the M43/M43A1 81-mm mortar projectiles. The features are the same as
No. 1390-20-1-4) (see app III).
6-21
UNCLASS F ED
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
)rik of Norway, is
fuze for use with
the NVI-2 (FOM
Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75
Fuze, Proximity, Type NlIT-23
FOM No, 1390-20-1-1
(,U) Design Details
Original
;
li
- FLRBINE
10
GEAR V
18
- ARMING FORK
26 - BOOSTER
2,3
it() MK
SCREEN PLATE
19
ARMING SHAFT
27 - CONTACT S
THREADS
4
GUAR I
12 -
ELECTRONIC
20
ARMING SPRING
28 - HOLE FOR
PACKAGE
CONTACT PIN
5
- BEARING
13
PRI NTL[)
21
- LOCKING PIN
29 - NOSE COVER
CIRCUIT
6
COIL FORMER
14
OSCILLATOR
22
- ARMING SHAFT
30 - DETONATOR
PLATE
THREADS
CONTACT
SrAToR
15
ELECTRONIC
23
- FORK SPRING
31 - DETONATOR
HoUS1NG
HOUSING
GEAR 110x
16 -
INSULATOR
24 -
TETRYL CHARGE32 - SHUTTER
17
ARMING SHAFT
25
- DETONATOR
33 - SA CONTAINER
177 34 - CONNECTION
SPRING
(UNCLASSIFIED)
Figure GM, Fun, proximity, Type NVT-23,
section view (U).
Figure 6-9 ?i!J.tocracto the cur/wore-ins of the NVT-23 design.
6-29
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
CONFIDENTIAL
Original
(C-NFD) Description
ASTI1?H
Fuze, Proximity, Type NV1'-26
FOM No. 1390-20-1-2
(UNCLASSIFIED)
Figure 6-10. Fuze, pro
The NVT-26 (fig 6-10)
elf-powered, proximity fuze
modification consists of a better
the object of obtaining nearer opt
mity, Type NVT-26,
full vie (Li).
modification of the Kongsberg V3penfabrik NVT-23,
use with the M49A2 60-mm mortar projectile. The
of the antenna to the M49A2E2, 60-mm shell with
urst height for all charges (see app
NO FOREIGN DISSEN
6-23
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CONFIDENTIAL
AST 60H-001-15
(This page intentionally left blank)
NO FOREIGN DISSEM
6-24
CONFIDENTIAL
(This page is UNCLASSIFIED)
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Or4gnaI ASTi16OHOO1J5
NOSE CAP
Fuze, Proximity, Type NVT-227
FOM No. 1390-20-1-3
SE PORTIO
REDUCTION
GEAR
UPPER
FUZE BODY
LOWER
FUZE BODY
ENERATOR
TURBI
UNIT
ELECTR
UNIT
SU DEA
Neg. 5111439
NERATOR
ARMINGHAFT
S&A DEVICE
ARMING FORK
BOOSTER
ASSEMBLY
(UNCLASSIFIED)
Figure 6-11. Fuze, proximity, Type NVT227, section view (U).
6-25
UNCLASSIF D
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75
Fuze, Proximity, Type NVT-227
FOM No. 1390-204-3
(U) Description
Original
The NVT-227 (fig 6-11), which is manufactured by Kongsberg V3pen1ahrik of Norway,
is a specific adaptation of the NVT-224, self-powered, proximity fuze for use with the
M49A4, 60-mm mortar projectile. This adaptation was pursued because of the generally
unsatisfactory performance of the NV*1-26 fuze (see app III).
(U) Modifications to NVT-224
Lowering the start and stop torques of the turbine generator to
accommodate the lower muzzle velocity of the 60-mm projectile.
Removing the apex sensor from the safety and arming chain to
accommodate the very low velocity change associated with the apex of
charge-2 trajectories.
Raising the oscillator frequency to improve antenna performance and
increase doppler sensitivity.
6-26
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Orisinal
c't
Neg. 5111440
1,12S" 20 N5-1 LI
15" -12 NE
tg- -465 -
FUZE WEIGHT 240 #
AST-1150H-001-75
Fuze, Proximity, Type NVT-2
FOM No. 1390-204-4
ALL DiMENSIGNS tJ NM UNLESS OTHERWISE STATED
FUZE WEIGHT. 3454
(UNCLASSIFIED)
Figure 6-12, Fuze, proximity, Type NVT-2, contour and full views (U).
rt.!) Description
The NVT-2 (fig 642) is ?a morotype, transistorized, self-powered, proximity fuze for
mortar projectiles. Kongsberg Openfabrik of Norway manufactures the NVT-2 in two
different sizes and weights to accommodate different size projectiles, Both fuzes function
identically.
6-27
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-0
7
Fuze, Proximity, Type NVT-2
FOM No. 1390-204-4
f,U, Unique Features
distinguishing feature of the NVT-2 is the use of a turbine that generates the
electrical energy necessary to operate the fuze, and provides the mechanical energy to
activate the S&A mechanism. The storage life of the fuze is thus indefinite. (See fig 6-13 for
main components.)
(UNCLAS D
Figure 6-13. Fuze, proximity, Type 2 section vie (U).
Functioning
The NVT-2 is a CW/cloppler-type fuze. The doppler signal is passed through a two-stage
amplifier, filter, and pulse-shaping circuit. A cumulative signal effect drives the amplifier
output into saturation, triggering the thyristors which ignite the tetryl primer. The height of
detonation is set during production for the optimum height for the projectile to be used.
6-28
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original AST-1160H-001-75
Fuze, Proximity, Type NVT-2
FOM No. 1390-20-1-4
(U) Functioning (Continued)
Thus, otherwise interchangeable fuzes will produce different heights of burst for different
projectile types. An impact switch is used to provide an electrical backup detonation in case
the proximity sensing electronics should fail.
(U) S&A
The high-speed turbine drives a rotating arming shaft through a suitable reduction gear.
This, in turn, withdraws the arming fork, permitting a tetryl pellet lead-through to rotate
into position, and also permitting electrical connections to the primer. This technique is
independent of setback and, within limits, muzzle velocity. The turbine requires a sustained
projectile velocity of at least 50 m/s so that mechanical arming takes place approximately
150 meters from the muzzle. The newest model incorporates an apex sensor to insure that
arming will not take place until after the projectile has passed the maximum trajectory
ordinate.
(U) Characteristics
Fuze assembly:
Body material
2
Weight
240 g (0.53 lb), 345 g (0.76 lb)
Markings
7
Booster:
Body material
2
Body length
Explosive tetryl
Explosive weight
Functional data:
Arming method
Firing method
Safety devices
Arming distance
Arming time
Self-destruct time
Delay time
Frequency (for VT fuze only)
6-29
Sustained projectile velocity
CW doppler
Protective nose cap locks turbine
150 m
Independent of muzzle velocity
Impact
s
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, Proximity, Type NVT-2
FOM No. 1390-20-1-4
(U) Applications* (Ammunition and Weapons)
Ammunition
Weapons
60-mm M49
81-mm M43,
81-mm L15A1
120-mm DM11
120-mm PEPA-LP (rocket-assisted)
107-mm M329
60-mm US
81-mm US,
81-mm UK L16A1
120-mm Tampella,
120-mm Hotchkiss-Brandt
107-mm US
The NVT-2 is a prototype (uze. These applications reflect manufacturer's claims. Specific adaptations have been
developed for a number of projectiles (see app III).
6-30
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original AST-1160H-001-75
Fuze, Proximity, Type NVT-224
FOM No. 1390-20-1-5
(U) Description
The NVT-224, which is manufactured by Kongsberg Vapenfabrik of Norway, is a
version of the NVT-23, self-powered, proximity fuze used with the M43A1 81-mm mortar
projectile. While the basic concept is the same as the NVT-23, the design is more flexible,
permitting modification for use with other weapons. The NVT-224 also incorporates silicon
transistors for greater reliability and a much stronger antenna insulating ring.
6-31
(Reverse Blank)
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RAI\
K PAGE
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original AST-1160H001-75
Fuze, Proximity, Type NVT-24
FOM No. 139O-2O-1-
(U) Description
The NVT-24 is manufactured by Kongsberg Vipenfabrik of Norway. It is a specific
adaptation of the NVT-23, self-powered, proximity fuze for use with 120-mm mortar
projectiles.
6-33
(Reverse Blank)
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BLANK PAGE
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UNCLASSIFIED
Origins AST-1160H-001-75
SAFE
Neg. 518436
TURBO-ALTERNATOR
IF
HF
PIMA
S&A MECH
PPD 327
SETBACK SWITCH
BOOSTER CHARGE
Fuze, VT, Model PPD 327
FOM No. 1390-20-1-7
(UNCLASSIFIED)
Figure 6-14. Fun, VT, Model PPD 327, section and contour views (U).
(U) Description
The proximity/PD fuze PPD 327 (fig 6-14) is based on the CW/doppler principle. The
fuze is designed to detonate the 60-mm mortar projectile at an optimum height above the
target in open terrain. If the proximity function fails, a sensitive stab detonator initiates the
explosive filling at impact. The fuze can be set (externally) for point detonation and can be
reset back to proximity function if desired.
6-35
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UNCLASSIFIED
AST-1160H-001-75
Fuze, VT, Model PPD 327
FOM No. 1390-20-1-7
(U) Design details
Original
Fuze arrangement. The fuze arrangement is shown in figure 6-14. The fuze consists of
an electronic section and a pyrotechnic section; the two section are joined just ahead of the
wrench slot. The turbo-alternator is placed in the front of the electronic section, then the
LF unit and the HF unit. The electronic section forms the front half of the antenna. The
pyrotechnic section contains the S&A mechanism and booster charges. The pyrotechnic
section together with the projectile forms the rear half of the antenna, which is a skew
dipole (fig 6-15).
The option switch is placed outside the electronic section and is resettable. For the PD
function, the alternator is shortcircuited.
Turbo-alternator. The turbo-alternator is an improved version of the existing KV
models, which have proved to have a very high reliability. The turbo-alternator is fitted with
a gearbox by which mechanical energy is transferred to the S&A mechanism.
LF unit. The generator ac voltage is rectified and ripple-filtered before regulator
input. The regulator is a part of a silicon integrated circuit specially designed for
turbine-powered proximity fuzes. A fixed-time delay in conjunction with a special apex
sensor makes the fuze safe for several seconds of flight. Another part of the integrated
circuit is an amplifier. The band-pass characteristics are set to the doppler signal band. The
amplifier is used to fire the detonator via the trigger and firing circuits. The amplifier gain
and the trigger-threshold level are well defined by the use of feedback technique.
S&A unit. The S&A mechanism is connected to the turbo-alternator via an arming
shaft with spline coupling. The S&A mechanism consists of a spring-loaded rotor with one
electric detonator and one stab detonator. In the safe position the rotor is locked with two
rollers held in two grooves in the rotor by the arming shaft, the explosive chain is
out-of-line, the electric detonator is short circuited, and the stab detonator is out-of-line
with its firing pin.
An integrating, setback detent is also contained in the rotor, so that in the safe position
the rotor is locked and the arming shaft prevented from rotation. This feature greatly
increases the safety of the system, since the setback detent must be released before the
arming shaft can be rotated. This prevents rotation of the turbine arming shaft, either
accidentally or by sabotage.
6-36
UNCLASSIFIED
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
Original AST-116011-001-75
(U) Functioning
ANTENNA
V
11F OSCi
DETECTOR -
Al
p-- FILTER
LEVEL
DETECTOR
RESET
Neg. 518435
SS
MECHANISM
TRIGGER
CIRCUIT
FIRING
CIRCUIT
TIME
DELAY
-1
-1
RI
Fuze, VT, Model PPD 327
FOM No. 1390-20-1-7
GATEABLE VOLTAGE
REGULATOR
ELECTRIC
DETONAT
IMPACT
DETONAT
TIME
DELAY
RIPPLE
FILTER
.11-
01005
BRIDGE
I APEX
SENSOR
PPD 317 BLOCK DIAGRAM
TURBINE
I I
AC
GEN
MECHANICAL
GEAR
(UNCLASSIFIED)
Figure 6-15. Fuze, VT, Model PPD 327, functioning sequence (U).
Mechanical arming. When the projectile is fired, the setback detent is released (5001
minimum), the blocking pin is free to move radially, and the arming shaft may be rotated.
When the projectile is outside the barrel, the turbine begins to rotate. Then the arming shaft
begins to rotate at a speed 1/312 times the turbine speed. After approximately five
revolutions, the rotor is free to rotate to the armed position, where it is locked. In this
position the electric detonator is switched from shortcircuiting, and the mechanical
detonator is positioned in line with its firing pin. Both detonators are in their explosive line.
The projectile has now travelled at least 100 meters from the tube.
6-37
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
UNCLASSIFIED
AST-1160H-001-75 Original
Faze, VT, Model PPD 327
FOM No. 1390-20-1-7
(U) Functioning (Continued)
Proximity arming. Due to the incorporated apex sensor, the whole fuze, including the
HF unit and firing circuit, is de-energized during the first half of the trajectory until the
apex is reached. Then the generator speed increases, turning on a time delay of 3 seconds.
Following this delay, the regulator comes on, energizing the HF unit and giving power to the
LF unit. The firing capacitor begins charging when the regulator comes on. This capacitor
has a separate delay which can be determined by the customer and set during production.
By using three separate time delays, together with an apex sensor, the fuze is extremely
safe against early bursts in the first part of the trajectory. This safety is partly reduced as the
target is approached.
Proximity function. As the fuze approaches the target, the doppler signal from the
HF detector increases and is amplified. When the amplitude reaches a certain level, set by
the level detector, the trigger circuit is activated. This turns on the firing circuit, discharging
the firing capacitor and firing the detonator.
Point detonation. When the fuze is set for point detonation, the turbo-alternator is
shortcircuited and no electric power is fed to the electronic sections. After mechanical
arming, the stab detonator is in line with its firing pin. When an object is hit, the stab
detonator is initiated and the projectile explodes.
6-38
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Declassified and Approved For Release 2014/03/04 : CIA-RDP09-01333R000100030001-0
CONFIDENTIAL
Original AST-1160H-001-75
Fuze, VT, Model NINA
FOM No. 1390-29-1-4
(C) Description
(C) The NINA proximity fuze is a prototype development being undertaken by
Phillips USFA of Eindhover, Netherlands, for use on all rotating artillery and mortar
projectiles fired from the 120-mm rifled mortar, 105-mm howitzer, 155-mm howitzer,
175-mm gun, and 8-inch howitzer.
(C) The fuze operates on the doppler principle and utilizes a loop antenna. It is
intended to function at accelerations from 800 to 22,000 g at 2800 to 20,000 rimin.
(U) The fuze is powered by a chromic acid battery molded in glass-filled nylon and
sealed against leakage by an ultrasonically-molded cover. The electrolyte is contained in a
glass ampoule with an attached weight to facilitate breakage under setback. The power is
voltage regulated and filtered.
(C) The fuze can be set for different arming times and HOB. An electrical setter
contacts seven pads near the base of the fuze, permitting selection of a proximity arming
time of 1.5 or 3 seconds and one of three HOB; 5, 8, or 10 meters. Turn on time is
determined by a resistor-capacitator (RC) timer. Accuracy is enhanced by the setter, which
measures the value of the R, the C, and the detector threshold and then applies an
appropriate charging voltage through two open lead relays in order to minimize bleed off.
Required time accuracy is maintained at least 15 min after setting.
(C) Impact functioning is provided by an exposed crush switch in the nose which is
connected to the firing circuit through choked leads to a double-element, locking, setback
switch and firing circuit. The S&A device, which establishes minimum arming distance, was
adopted directly from the Swiss Dixie fuze. A four-element explosive train is employed. The
first element is a low-output electric primer attached to the E head. This is followed by a
sensitive lead, an out-of-line tetryl lead, and a tetryl booster.
(C) The NINA VT fuze utilizes a longitudinal, one-turn loop with a circuitboard
mounted coplanar with the loop. A field effect transistor chip mounted at the top of the
board is the principal active device in the circuit. Doppler signals are amplified by an
integrated circuit (IC) with a 280 active device mounted on a two-sided printed circuit
board. Firing occurs when the first doppler cycle exceeds a set threshold. No integration or
other sophistication is used for signal processing.
6-39
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CONFIDENTIAL
AST-1160H-001-75 Original
Fuze, VT, Model NINA
FOM No. 1390-29-1-4
(C) Description (Continued)
(C) Protection against countermeasures is provided by circuitry that permanently
reduces the HOB to half or to impact, depending on the severity of the jamming before
electrical arming takes place. This is performed by switching and sensing functions in the IC.
A limiter circuit provides protection against radar pulses.
(C) Characteristics
Functional data:
An
Principle
Acceleration
Rotation
Applicable Mil. Std
Base safety
Impact
Proximity action
Time setting
HOB
Operating temperature range
Storage temp. range
Anti-jamming devices
Reliability
Battery
Stage of development
6-40
Loop
Doppler
Min 800 g
Max 22,000 g
Min 2800 r/min
Max 20,000 r/min
Mil. Std. 333, Mil. Std. 331
Pyrotechnic train armed between a min
of 40 m and a max of 300 m (between 0.5
and 1 s)
Superquick
Impact action armed between a min of
0.5 s and a max of 1 s
Functioning at impact angles of 0? -75?
with normal electric switch
After 3 s if no time setting, or 1 s
after time set, last 3 s of flight
MM 4s, max 120 sin steps of 0.1 s
Accuracy ?2.5%, or min of 1 s
RC timer
5, 8, or 10 m at reflection coefficient 0.5
32? to +52?C according to
Stanag 2831 (-25? to +125?F)
-34? to +63?C
By timing and by "ASPRO" system of
detection and reducing jamming
85%
Chromic acid
Prototype production mid 1974;
full production 1976
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CONFIDENTIAL
Original AST-1160H-001-75
Fuze, VT, Model NINA
FOM No.1390-29-1-4
(C) Characteristics (Continued)
Safety devices Electric and pyrotechnic
Primer Electric
Electronic components Integrated circuits & transistors
Price N fl. 120
6-41
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CONFIDENTIAL
AST-1160H-001-75 Original
(This page intentionally left blank)
6-42
CONFIDENTIAL
(This page is UNCLASSIFIED)
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UNCLASSIFIED
Original
WEIGHT : 594q
AST-1160H-001-75
Fuze, VT, Model 1.P.
FOM No. 1390-37-14
Ii.
48.3 max
053.2 ma x.
a
0
N
re
dimensions in mm
Neg. 515310
Figure 6-16. Fuze, VT, Model I.P., contour view (U).
(U) Description
(UNCLASSIFIED)
The Israeli Military Industries (IMI) fuze, Model I.P. (fig 6-16) is a transistorized,
electric-powered, VT fuze with a reliable arming mechanism and an electronic
target-detection unit to assure effective airburst above the target. The fuze operates on the
doppler principle. Due to the absence of a chemical power source, the storage life of the
fuze is practically unlimited. The fuze was designed for use with nonrotating ammunition.
(U) Unique features
? Back-up impact function in case of electronic failure.
? Electronic target-detection unit.
? Delayed-arming mechanism.
? Electrical arming.
6-43
UNCLASSIFIED
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UNCLASSIFIED
AST-11601-1-001-75 Original
Fuze, VT, Model 12.
FOM No. 1390-37-1-1
(U) Characteristics
Fuze assembly:
Body material
Weight 594 g (1.31 lb)
Markings
Length 227 mm (8.94 in)
Max diam 61.5 mm (2.42 in)
Booster:
Body material
Body length 27.7 mm (1.09 in)
Explosive
Explosive weight 7
Functional data:
Arming method Electric
Firing method Electronic or impact
Safety devices Delayed arming
Arming distance 7
Arming time
(U) Dcsign Details
The Model I.P. proximity fuze (fig 6-17) consists of an electronic unit of solid-state
components, electrical power supply, firing capacitor, electric squib, impact-switch delayed
arming mechanism, electric detonator, and booster assembly, as well as a back-up impact
detonator. The impact detonator has been incorporated in the fuze in case of electronic
failure.
6-44
UNCLASSIFIED
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UNCLASSIFIED
Original
(U) Design Details (Continued)
Fmng Capacitor,
AST-1160H-001-75
Fuze, VT, Model LP.
FOM No. 1390-374-1
Squib
Impact Switch
Neg. 515306
Power Supply
Electronic Unit
SOLID-STATE COMPONENTS
PRINTED CIRCUITRY
Booster
Time Delay Mechanism
Figure 6-17. Fuze, VT, Model LP., exploded view (U).
(U) Functioning
(UNCLASSIFIED)
Upon firing, the fuze is electrically powered; the altitude detector functions on the
doppler principle to generate an impulse to the thyristor-type firing circuit. Simultaneously
at launch, the time-delay mechanism is electrically initiated. (See fig 6-18 for firing
sequence.)
6-45
UNCLASSIFIED
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UNCLASSIFIED
AST-1160H-001-75
Fuze, VT, Model I.P.
FOM No. 1390-37-1-1
(U) Functioning (Continued)
Alfitude
Dotoctor
Firing Firing
Circuit Capacitor
Squib NM+ Detonator
Impact
Switch
Time
Delay
Device
Electrical
Arming
Original
Neg. 515307
(UNCLASSIFIED)
Figure 6-18. Fuze, VT, Model I.P., firing sequence (U).
(U) Applications (Ammunition and Weapons)
Ammunition
Weapons
120-mm HE projectiles
120-mm mortars
6-46
UNCLASSIFIED
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UNCLASSIFIED
Original
P4 eking
AST-11601-1-001-75
Fuze. VT, Model I.P.
['OM No. 1390-37-1-1
Neg. 515311
(UNCLASSIFIED)
Figure 649. Fuze, VT, Model I.P., hermetically-sealed
container and woodcn box (U).
n-47
UNCLASSIFIED
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, VT, Model I.P.
FOM No. 1390-37-1-1
(1J) Packing (Continued)
Each fuze is packed in a hermetically-sealed, sheet-metal container (fig 6-19). Fifteen
fuzes are overpacked in a rigid, foam-lined, wooden box with a volume of 0.08 m'and
weight of 24 kg.
6-48
UNCLASSIFIED
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UNCLASSIFIED
Original AST-1160 H-001-75
Section VII.
MINE AND GRENADE FUZES, IGNITERS,
AND NONELECTRIC FIRING DEVICES
7-1
(Reverse Blank)
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UNCLASSIFIED
Original
Section VII.
MINE AND GRENADE FUZES, IGNITERS,
AND NONELECTRIC FIRING DEVICES
GENERAL
(U) Mine and grenade fuzes have been designed or are under development for antitank
and antipersonnel applications. Mine fuzes usually are contact-type fuzes that are actuated
by direct application of pressure when tanks or personnel cross over the buried mines.
Grenade fuzes are of the pyrotechnic delay-type, in which a cocked striker stabs a detonator
after the delay element bums out.
(U) Removable safety clips are used with mine fuzing to keep the mines in the
unarmed state until they are laid or implanted; a safety ring and pin normally keep the
grenade in an unarmed state until removed prior to throwing or launching from the grenade
launcher.
(U) Igniters and firing devices are used with mines, grenades, and explosive charges in
a variety of applications including mine clearance, antipersonnel, antitank, and booby trap
operations.
(U) The fuzes and igniters described in this section are considered within the
state-of-the-art; in some instances, they incorporate unique features.
7-3
(Reverse Blank)
UNCLASSIFIED
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UNCLASSIFIED
Original
FOM No.
AS1'-1160H-001-75
INDEX
Nomenclature* Page
Mine Fuzes
1390-16-5-1 Fuze, Mine, Pressure/Pull,
Model DM-56 7-9
1390-17-5-2 Fuze, Mine, Pressure, Chemical,
Model 1951 7-11
1390-17-5-5 Fuze, Mine, Pressure, Nonmetallic,
Model 50
1390-17-5-6 Fuze, Mine, Pressure, Nonmetallic,
Model 52 7-15
1390-19-5-1-3 Fuze, Mine, Pull, Model 48 7-17
1390-19-5-2 Fuze, Mine, Pressure, Model 47 7-19
1390-19-5-3 Fuze, Mine, Pressure, Model 49 7-21
1390-29-5-2 Fuze, Mine, Pressure, Nonmetallic,
Model 26 7-23
1390-29-5-3 Fuze, Mine, Pressure, Nonmetallic,
Model 22 7-25
1390-33-5-3 Fuze, Mine, Pressure, Chemical,
Plastic, Model 52 7-27
1390-33-5-5 Fuze, Mine, Pressure/Pressure Release
Model 47-11 7-29
1390-35-5-1 Fuze, Mine, Pressure, No. 2
Mk 2/1 7-31
1390-35-5-2 Fuze, Mine, Pressure, No. 4
Mk 2 7-35
1390-16-4-8 Fuze, Grenade, Pyrotechnic Delay,
Integral, Model (Diehl)
1390-16-9-1 Fuze, Grenade, Pyrotechnic Delay,
Model DM 82 7-41
1390-35-4-2 Fuze, Grenade, Model L25A2
7-13
Grenade Fuzes
7-39
*All fun nomenclatures are UNCLASSIFIED.
7-5
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AST-1160H-001-75 Original
FOM No.
INDEX (Continued)
Nomenclature*
Igniters
Page
1375-17-3-1 Igniter, Pull Type, Model Mk F2 7-47
1375-17-3-2 Igniter, Nondetectable, Model
ALBACID 7-49
Nonelectric Firing Devices
1375-17-3-3 Firing Device, Pull Type,
Nondetectable, Model ALSETEX
*All fuze nomenclatures are UNCLASSIFIED.
7-6
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7-51
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Original AST-1160H-001-75
LIST OF ILLUSTRATIONS
Figure Title* Page
Mine Fuzes
7-1 Fuze, mine, pressure/pull, Model DM 56, general
and section views 7-9
7-2 Fuze, mine, pressure, chemical, Model 1951,
general view 7-11
7-3 Fuze, mine, pressure, nonmetallic, Model 50,
general and section views 7-13
7-4 Fuze, mine, pressure, nonmetallic, Model 52,
general and section views 7-15
7-5 Fuze, mine, pull, Models 41, 42, 42P, and 48,
general and section views 7-17
7-6 Fuze, mine, pressure, Model 47, section view 7-19
7-7 Fuze, mine, pressure, Model 49, section and
exploded views 7-21
7-8 Fuze, mine, pressure, nonmetallic, Model 26,
general and section views
7-9 Fuze, mine, pressure, nonmetallic, Model 22,
general and section views
7-10 Fuze, mine, pressure, chemical, plastic, Model
52, external views
7-11 Fuze, mine pressure/pressure release, Model
47-11, general and section views
7-12 Fuze, mine, pressure, No. 2 Mk 2/1, general
and section views
7-13 Fuze, mine, pressure, No. 4 Mk 2, general
and section views
Grenade Fuzes
7-14 Grenade, HE, 76 mm, Model (Diehl), section view
7-15 Fuze, grenade, pyrotechnic delay, integral,
Model (Diehl)
7-16 Fuze,-grenade, pyrotechnic delay, Model DM
82, general and section views
*All figure rules are UNCLASSIFIED.
7-7
UNCLASSIFIED
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7-23
7-25
7-27
7-29
7-31
7-35
7-39
7-39
7-41
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UNCLASSIFIED
AST-1160H-001-75 Original
Figures Title* Page
7-17 Fuze, grenade, pyrotechnic delay, Model
DM 82, cutaway view 7-42
7-18 Fuze, grenade, Model L5A2, section view 7-45
Igniters
7-19 Igniter, pull type, Model Mk F2,
general view 7-47
7-20 Igniter, nondetectablc, Model ALBACID,
general view 7-49
Nonelectric Firing Device
7-21 Firing device, pull ty pc, nondetectable,
Model A LSETEX, general view 7-51
7-8
UNCLASSIFIED
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UNCLASSIFIED
Original
AST-1160H-001-75
Fun, Mine, Pressure/Pull, Model DM 56
FOM No. 139046-54
SAFETY PIN
AND CAP
ASSEMBLY
STRIKER-
RETAINING
FORK
STRIKER
SPRING
BODY
STRIKER
DETONATOR
ASSEMBLY
Neg. 509523 (UNCLASSIFIED) Neg. 509524
(U) Description
(UNCLASSIFIED)
Figure 7-1. Fuze, mine, pressure/pull, Model DM 56,
general and section views (U).
The DM 56 (fig 7-1) is a combination pressure- or pull-activated fuze used with the DM
31 antipersonnel mine. Except for the aluminum detonator assembly, the fuze is made of
brass. The external fuze threads are protected by a red, molded-plastic shipping cap. A
safety-pin assembly insures safety until the fuze is to be armed.
7-9
UNCLASSIFIED
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, Mine, Pressure/Pull, Model DM 56
FOM No. 1390-16-5-1
(U) Functioning
The fuze is armed by unscrewing the safety-pin cap from the safety-pin assembly and
removing the safety pin from the striker. The striker is then held against the compressed
striker spring by the striker retaining fork. A pressure of 12 lb (5.5 kg) applied to the striker
head forces open the lugs of the retaining fork, allowing the striker spring to drive the
striker forward. Removal of the retaining fork by a trip wire will also initiate fuze action.
7-10
UNCLASSIFIED
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UNCLASSIFIED
Original AST1160H-001-75
Ficre, Mule, Pressure, Chenntai, Model 1951
EOM No, 13901T5-2
Neg. 509525 (UNCLASSIFIED)
Figure 7-2. Fuze, mine, pressure, chemical,
Model 1951, general view (U).
(U) Description
This universal, nonmetallic ?(plastic), pressure fuze (fig 7-2) is armed by removing the
detonaror retaining ring, inserting a Model 50 detonator in the fame well, and replacing the
ring. The fuze may he used in any antitank mine.
(U) Functioning
Pressure on the plunger ruptures the hear ?collar, allowing the plunger to move and
crush a vial of add. The acid reacts with a chemical pellet and initiates the detonator by
hypergolie reaction,
74!
(Reverse Blank)
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UNCLASSIFIED
Original
Neg. 514559
(U) Description
AST-1
OH
1-75
FLUE', Mine, Pressure, Nonmetallic, Model 50
FOM No. 1390-17-S-5
iffEga
-8110
011.14,10
(UNCLASSIFIED) !Neg. 514555
Figure 7-3. Fun, mine, pressure, nonmetallic,
Model 50, general and section views (14
II NC LASSIFIED
The Model 50 fuze (fig 7-3) is made of plastic, with no metallic components; it is
practically undetectable by electronic mine detectors. It was designed for use in the Model
51 antitank mine. The fuze is armed by installing the detonator; it has no safety devices,
(U) Functioning
When a force of 75 lb (34 kg) is applied to the plunger, the shear pin fails and the
plunger moves downward, crushing a vial of acid. Thc acid reacts with a chemical pellet to
produce a flame which initiates the detonator.
7-13
(Reverse Blank)
UNCLASSIFIED
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UNCLASSIFIED
Original
Neg. 514560 (UNCLASSIFIED)
( U) Description
AST-1160H-001-75
Fuze, Mine, Pressure, Nonmetallic, Model 52
FOM No. 1390-17-5-6
FRICTION-SENSITN
COMPOUND
STRIKER
Neg. 514561
Figure 7-4. Fuze, mine, pressure, nonmetallic,
Model 52, general and section views (U).
(UNCLASSIFIED)
The Model 52 fuze, like the Model 50, is made of plastic with no metallic components
(fig 7-4). It is designed for use in nonmetallic antitank mines. The fuze is armed by installing
the detonator; it has no safety devices.
7-15
UNCLASSIFIED
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UNCLASSIFIED
AST-116011-001-75 Original
Fuze, Mine, Pressure, Nonmetallic, Model 52
FOM No. 1390-17-5-6
(U) Functioning
When a force of approximately 33 lb (15 kg) is applied to the striker, the integral shear
collar fails. The conical lower end of the striker, which is charged with a mixture of red
phosphorus and ground glass, is forced against a mating surface. The resulting friction ignites
the red phosphorus, in turn initiating the detonator.
7-16
UNCLASSIFIED
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UNCLASSIFIED
Origins
REMOVABLE TOPS AND
STRIKER ASSEMBLIES
MODEL 41
Neg. 508883
(U) Description
COTTER TYPE SAFETY
TRANSIT PIN
STRIKER
RETAINING
PIN HOLE
AST-1160H-001-75
Fuze, Mine, Pull, Model 48
FOM No. 1390-19-5-1-3
FIXED TOPS AND
STRIKER ASSEMBLIES
CLIP-TYPE
SAFETY PIN
PERCUSSION
CAP
STRAIGHT STRIKER.
RETAINING PIN
MODEL 42 MODEL 42P
WINGED STRIKER.
RETAINING PIN
DETONATOR, FACTORY
INSTALLED
MODEL 48
(UNCLASSIFIED)
Figure 7-5. Fuze, mine, pull, Models 41, 42, 42P, and 48,
general and section views (U).
The Swedish Models 41, 42, 42P, and 48 pull fuzes (fig 7-5) are basically the same; all
are simple pull fuzes with spring-loaded strikers. They are activated by a pull of from 5 to
11 lb (2.27 to 5 kg) on the striker retaining pin. These fuzes are used on Models 41, 42, and
42P trip flare antipersonnel mines.
(U) Functioning
When a pull of from 5 to 11 lb (2.27 to 5 kg) is exerted on the striker retaining pin, the
pin is withdrawn, allowing the spring-loaded striker to snap forward, striking the stab primer
and initiating fuze action.
7-17
(Reverse Blank)
UNCLASSIFIED
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UNCLASSIFIED
Origins AST-1160H-001-75
SPRING
CASE
STRIKER
Neg. 508893
1.3 INCHES
teA
//.:4 /
? 1 ? xN
Fuze, Mine, Pressure, Model 47
FOM No. 1390-19-5-2
PLUNGER
SHEAR PIN
STRIKER-RETAINING
BALL
THREADED
BUSHING
PERCUSSION CAP
DETONATOR ASSEMBLY
(UNCLASSIFIED)
Figure 7-6. Fine, mine, pressure, Model 47, section view (U).
(U) Description
The Model 47 pressure fuze (fig 7-6) consists of a cylindrical metal case that houses a
plunger retained by a shear pin and a spring-loaded striker retained by balls. The plunger
protrudes through the top of the case; the shear pin passes through the plunger and rests on
the top of the case. A threaded bushing screwed into the bottom of the fuze retains the stab
primer and detonator assembly. The fuze is used in antitank mines.
7-19
UNCLASSIFIED
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, Mine, Pressure, Model 47
FOM No. 1390-19-5-2
(U) Functioning
When a pressure of 440 lb (200 kg) is applied to the top of the plunger, the shear pin
fails, freeing the plunger. When a second pressure pulse of 44 lb (20 kg) is applied, the
retaining balls are freed and the spring-loaded striker drives the firing pin into the stab
primer, initiating fuze functioning.
7-20
UNCLASSIFIED
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UNCLASSIFIED
Original
SAFETY-CLIP
CORD
PLUNGER
SAFETY CL IP
COLLAR
METAL MEMBRANE
SPRING
STRIKER
Neg. 508894
BUSHING
STRIKER-RETAINING
LUG
AST-116011-001-75
Fuze, Mine, Pressure, Model 49
FOM No. 1390-19-5-3
PERCUSSION CAP
DETONATOR ASSEMBLY Neg. 509529 (UNCLASSIFIED)
(UNCLASSIFIED)
Figure 7-7. Fuze, mine, pressure, Model 49, section and exploded views (U).
(U) Description
The lower part of the Model 49 fuze (fig 7-7) contains an integral primer-detonator
assembly and a spring-loaded striker retained in position by small lugs. The top of the
assembly is covered by a thin metal membrane. The entire assembly is held within a
cylindrical collar by a threaded bushing. A four-pronged plunger, held in position by a
safety clip, is set into the cylindrical collar. This fuze is used in antitank mines.
(U) Functioning
The fuzc is armed by removing the safety clip. Pressure applied to the plunger forces
the latter through the metal membrane, compressing the striker spring. Sufficient pressure
will cause the lugs retaining the striker to fail, allowing the striker spring to drive the
primer-detonator, initiating fuze functioning.
7-21
(Reverse Blank)
UNCLASSIFIED
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Original
AST-1160H-001-75
Fuze, Mine, Pressure, Nonmetallic, Model 26
FOM No. 1390-29-5-2
SHEAR COLLAR
FRICTION-SENSITIVE
COMPOUND
STRIKER
Neg. 509527 (UNCLASSIFIED) Neg. 509528
Figure 7-8. Fuze, mine, pressure, nonmetallic,
Model 26, general and section views (U).
(U) Description
(UNCLASSIFIED)
The Model 26 fuze (fig 7-8) resembles the French Model 52 fuze. Made almost entirely
of plastic, this fuze is used in the Model 26 heavy antitank mine. The absence of metallic
components makes this fuze/mine combination extremely difficult to detect with electronic
mine detectors. Model 26 fuzes and their detonators are packed in individual plastic
containers.
(U) Functioning
The fuze is armed by installing a detonator when the fuze is assembled to the mine.
When pressure between 35 and 100 lb (16 to 45 kg) is applied to the top of the striker, a
shear collar fails, allowing the striker's tapered end, which is coated with a friction-sensitive
compound, to enter a mating tapered recess within the fuze body. Friction creates a flame
which initiates the detonator.
7-23
(Reverse Blank)
UNCLASSIFIED
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Origins
AST-1160H-001-75
Fun, Mine, Pressure, Nonmetallic, Model 22
FOM No. 1390-29-5-3
Neg. 509530
Neg. 509529 (UNCLASSIFIED)
Figure 7-9. Fuze, mine, pressure, nonmetallic,
Model 22, general and section views (U).
(U) Description
(UNCLASSIFIED)
The Model 22 fuze (fig 7-9) consists of a plastic body, a cone-shaped cup, and a striker
with an integral shear collar. The bottom end of the striker is conical to mate with the cup.
Both conical surfaces are coated with a friction flash compound. The fuze is used in the
Model 22 antipersonnel mine.
(U) Functioning
When a force of 11 to 55 lb (5 to 25 kg) is applied to the upper end of the striker, the
shear collar fails and the striker is forced downward. Friction between the conical mating
surfaces results in a flame which initiates the detonator.
7-25
(Reverse Blank)
UNCLASSIFIED
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BLA PASE
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UNCLASSIFIED
Original
AST-1160H-001-75
Fuze, Mine, Pressure, Chemical, Plastic, Model 52
FOM No. 1390-33-5-3
Neg. Si:45 (UNCLASSIFIED)
Figure 7-10. Fuze, mine, pressure, chemical, plastic,
Model 52, external views (U).
(U) Description
This polystyrene fuze (fig 7-10) encloses two chemical-filled vials. Four of these fuzes
are used in the Model 52 antitank mine (FOM No. 33-1345-1-5). A plastic plunger, retained
over the vials by a plastic shear collar, fits into the top of the fuze.
(U) Functioning
Pressure applied to the top of the mine breaks the mine's shear lugs, transferring
pressure to at least one of the four fuze plungers. The fine's shear collar fails under pressure,
and the plunger crushes the two vials. The chemicals (sulphuric acid and potassium
perchlorate) react, causing a flame that initiates the detonator-booster and the main charge.
7-27
(Reverse Blank)
UNCLASSIFIED
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RAI\
K PAGE
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UNCLASSIFIED
Original
Neg. (UNCLASSIFIED)
508443
AST-11608-001 -75
Fuze, Mine, Pressure/Pressure Release, Model 47-11
FOM No. 1390-33-5-5
UPPER RECESS
LOWER RECESS
Neg. 508442
PRESSURE SHEAR PIN
Figure 7-11. Fuze, mine, pressure/pressure release,
Model 47-11, general and section views (U).
7-29
UNCLASSIFIED
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STRIKER SPRING
STRIKER RETAINING
BALLS (2)
ARMING SHEAR PIN
STRIKER
PERCUSSION CAP
DETONATOR
(UNCLASSIFIED)
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UNCLASSIFIED
AST-1160H-001-75 Original
Fuze, Mine, Pressure/Pressure Release, Model 47-11
FOM No. 1390-33-5-5
(U) Description
The Model 47-11 fuze (fig 7-11) is quite similar to the World War 11 German Tel'ermine
fuze 43. The fuze weighs 127.5 grams (0.28 lb). The fuze body is of steel. The Model 47-11
fuze is used in the Model 47-1 antitank mine (FOM No. 33-1345-1-2).
(U) Functioning
The fuze is armed upon installation in a mine by screwing down the pressure plate.
This action forces the plunger down, causing the arming shear pin to fail. The fuze is then
armed; the striker spring, which is partially compressed, keeps the plunger in contact with
the pressure plate. The latter limits further upward movement of the plunger, while two
striker retaining balls prevent the striker spring from forcing the striker down into the stab
primer. In this position the fuze cannot function by the addition or release of pressure.
If a load of 550 lb (250 kg) or greater is applied to the pressure plate, the plunger is
forced downward and the pressure shear pin fails, allowing further downward movement.
When the upper recess within the plunger becomes aligned with the striker retaining balls,
the balls are free to be cammed outward by the spring-loaded striker. This action frees the
striker to snap downward under pressure of the striker spring, so that it impacts the stab
primer and initiates the detonator.
Should the pressure plate be removed, the striker spring forces the plunger upward
until the lower edge of the plunger clears the striker retaining balls. The spring-loaded striker
then cams the balls outward into the lower recess, freeing the striker to snap downward and
impact the stab primer to initiate the detonator. The fuze has no other safety devices.
7-30
UNCLASSIFIED
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CONFIDENTIAL
Original
AST-1160H-001-75
Fuze, Mine, Pressure, No. 2 Mk 2/1
FOM No. 1390-35-5-1
STRIKER CROWN
1.47 IN DIAM
CAP
SAFETY PIN ?:
RUBBER SEALING RING
STRIKER SUPPORTING RING
SIKER
1.15 IN
RETAINING CUP
.1 DETONATOR, NO 1A PER&
MINE FUZE, MARK 1/1
DETONATOR
115 GR "A" CASED/
PRESSED A.S.A. COMPOSITION
(ABOUT 0.35 GRAM)
321N
PRESSED C. E. (ABOUT 0.55 GRAM)
Neg. 552522
(C) Description
?..
ALL DIMENSION'S ARE IN INCISES-
Figure 7-12. Fuze, mine, pressure, No. 2 Mk 2/1,
general and section views (U).
IN ElIAM.1.
(CONFIDENTIAL)
The No. 2 Mk 2/1 mine fuze (fig 7-12) is a pressure-operated type developed by the
United Kingdom for use with the No. 6 Mk 1 antipersonnel mine. Except for the detonator
housing and the tip of the striker, the fuze assembly is made of nonmetallic materials. The
fuze is designed to resist activation by the blast of an antitank mine detonated not less than
6 ft away. The fuze consists principally of a body, cap, striker, striker supporting ring,
safety-pin sealing ring, retaining cup, and a 2.5-gr (0.16-gram) detonator.
7-31
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CONFIDENTIAL
AST-1160I1-001-75 Original
Fuze, Mine, Pressure, No. 2 Mk 2/1
FOM No. 1390-35-5-1
(C) Design Details
Body. The body is made of clear unpigmenied polystyrene. Externally it is cylindrical
in shape with ribs formed around the circumference. A large boss is formed in the center of
the base, and a recess is formed in this boss to house the assembled detonator. The external
portion of the boss is threaded to screw into the adapter of the mine; around the boss, the
body is hollowed out. A recess is also formed in the top surface of the body, and in the
center of this recess a cone-shaped hole is formed, the base of the hole connecting with the
detonator recess.
Cap. Made of polystyrene, colored camouflage brown, the cap is roughly
dome-shaped; the surface above where it fits into the body is left hatched. A hole is formed
in the center to take the striker. Before the cap is assembled in the top of the body, the rim
is coated with RD 1279 cement, and the two components are compressed until the cement
has hardened.
Striker. Made of polystyrene, colored camouflage brown, the striker consists of a
stem with the lower portion formed into a truncated cone, the tip of which is fitted with a
brass striker pin. A 3/32-inch-diameter hole is drilled through the stem at right angles to the
axis to accommodate the safety pin. To obviate the possibility of the safety-pin hole being
fouled by the ingress of adhesive composition, a hole is drilled concentrically through the
stem and is closed at the upper end with a parallel polystyrene plug secured in position with
RD 1279 cement.
Striker supporting ring. A split supporting ring of ebonite, molded in the form of a
horseshoe and tapered internally to suit the cone of the striker, is positioned just below the
highest diameter of the cone and rests on the fuze body. The striker is designed so that
when assembled in the fuze the truncated cone is clear of the supporting ring.
Safety pin. The safeiy pin consists of a length of No. 14 SWG 2.03-mm (0.08-inch)
(equivalent to No. 12 AWG) phosphor-bronze wire bent to form two separate arms: one
straight for insertion through the hole in the stem of the striker, the other with a
semicircular bend in it to clip around the external circumference of the striker. A finger
loop is also formed to facilitate extraction.
Sealing ring. A small rubber sealing ring fitted around the striker stem, just above the
truncated cone, is under radial compression between the stem of the striker and fuze cap,
providing a watertight seal.
7-32
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CONFIDENTIAL
Original AST-116011-001-75
Fuze, Mine, Pressure, No. 2 Mk 2/1
FOM. No. 1390-35-5-1
(C) Design Details (Continued)
Retaining cup. This is of white polystyrene, in the form of a cup, with a hole formed
in the base. It fits over the head of the No. 106 detonator and also accommodates the 2.5-gr
(0.16-gram) "A" detonator, which is assembled in the top of the open end of the former.
The cup with detonators assembled is coated with RD 1221 A cement, covered with a tin
foil disk, and then pushed home in the hole in the center of the body where the cement is
allowed to set hard.
Detonator 2.5-gr (0.16-gram) "A" cased. This is a tinned brass, cased cup formed with
an external flange and filled with 2.5 gr (0.16 gram) of "A" mixture. It is distinguished by
being marked with a green spot. It is assembled in the open end of the No. 106 detonator,
the flange resting on the rim or mouth of the No. 106 detonator.
Detonator No. 2 Mk 1/1, antipersonnel mine fuze. This consists of the retaining cup
(see above) and a No. 106 Mk 1 detonator. Before the No. 106 detonator with the 2.5-gr
(0.16-gram) "A" cased detonator assembled in the top is pushed down through the hole in
the cup, approximately two turns of waterproof fabric adhesive tape 0.17 inch (4.32 mm) in
width is wrapped around the No. 106 detonator above the flange and coated with RD 1219
composition. The flange of the detonator is also coated with RD 1219 composition, and the
detonator is then pushed into the retaining cap until the flange rests on the base of the cup.
A fillet of RD 1219 composition is applied to the joint where the detonator emerges from
the base of the cup.
Detonator No. 106 Mk 1. This is in the form of a tube with an inverted domed base
with a flange formed just below the open end. It is filled, commencing from the base, with
about 0.55 gram (8.4 grains) of CE (i.e., tetryl) pressed in, above which is about 0.35 gram
(5.3 gr) of A.S.A. composition also pressed in, leaving the top portion of the tube empty.
(C) Laying of Mine
To facilitate actuation of the fuze when assembled to the mine, a striker crown is
provided. The striker crown, of brown polystyrene, consists of a crown-shaped piece having
three equispaced diverging prongs. It is positioned over the projecting end of the fuze striker
to increase the effective area of the head after laying. There are two current marks of striker
crown, the Mark 1/1 and the Mark 2. The differences are as follows:
7-33
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CONFIDENTIAL
AST-1160H-001-75 Original
Fuze, Mine, Pressure, No. 2 Mk 2/1
FOM No. 1390-35-5-1
(C) Laying of Mine (Continued)
Mark 1/1. - This is a Mark 1 pattern modified by the insertion into the recess of
a 0.1-in (2.54-mm) thick white polystyrene disk, thereby reducing the depth of the recess to
that of the Mark 2 pattern.
Mark 2. - The Mark 2 is generally similar to the Mark 1/1, and differs from the
original Mark 1 pattern by haying the depth of the body recess reduced from 0.4 to 0.3 inch
(10.6 to 7.62 mm) and a recess 0.156x0.1 inch (3.96x2.54 mm) deep formed in the center
of the base of the larger recess. A 1/4-inch (6.25-mm) figure '2' is moulded on top of the
body.
(C) Functioning
The fuze is pressure-activated. The amount of pressure required to activate the
fuze is unknown.
7-34
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CONFIDENTIAL
Original
RUBBER SEALING RING
NEEDLE
DETONATOR
(5 GR. AZ)
STEMMED C E.
ARMED
? CAP
SCREW
LOCKING PIN
SPRING
? PLUNGER
- BODY
COLLAR
STRIKER DIAPHRAGM
POSITIONING RING
STRIKER HOUSING
SEPTUM
AST-1160H-001-75
Fuze, Mine, Pressure, No. 4 Mk 2
FOM No. 1390-35-5-2
SAFETY CLIP
RUBBER SEALING RING
DETONATOR HOUSING
UNARMED FUZE CLIP
Of fitted. attached to SAFETY CLIP)
Neg. 552523
ON ACTUATION
ALL DIMENSIONS IN INCHES
(CONFIDENTIAL)
Figure 7-13. Fuze, mine, pressure, No. 4 Mk 2,
general and section views (U).
7-35
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CONFIDENTIAL
AST-1160H-001-75
Fuze, Mine, Pressure, No. 4 Mk2
FOM No. 1390-35-5-2
(C) Description
Original
The No. 4 Mk 2 fuze (fig 7-13) is a pressure-operated fuze developed by the United
Kingdom for use with the Mk 7 series antitank mines. It consists principally of a body, main
spring, cap, screw, plunger, striker assembly, positioning ring, striker housing, detonator
housing, and a 5.7-gr (03.7-gram) "AZ" detonator and safety clips.
(C) Design Details
Body. Made of aluminum alloy anodized, the body is cylindrical in shape and is
reduced in diameter at the top to form a guide, below which is a flange to support the
spring. A hole is formed centrally to accommodate the plunger, positioning ring, and striker
diaphragm?below which the body is screw-threaded to accept the striker housing. The
words "MINE UNARMED" are stamped around the bottom face of the body and filled in
with red.
Cap. The cap is made of electrozinc-plated steel. Externally, it is dome shaped with a
flat top and is formed with a flange at the base. The words "MINE ARMED" are stamped
on the top and filled in with red. Internally, it is hollowed out to accommodate the spring;
it has a boss formed in the center to fit into the recess made in the top of the plunger and a
central clearance hole drilled through the top to allow the screw to pass through and engage
in the top of the plunger. When the cap is assembled and the screw is screwed home in the
top of the plunger, a pin of hard brass is driven obliquely through the cap, plunger, and
screw, locking these three components together, after which the end of the pin is stabbed to
retain it in position.
Plunger. The plunger is made of electrozinc-plated steel. Externally, it is cylindrical in
shape and is formed with a flange near the base, below which it is reduced in diameter to
form a small boss. A small recess is formed in the top face to fit over the boss formed inside
the cap, and a hole is drilled in the center and threaded to accept the shank of the
hexagon-head screw which secures the cap in position. A rubber sealing ring seats in a groove
around the plunger and seals the mating surfaces between the body and the plunger.
Spring. The spring is a cylindrical coiled spring of rectangular-section spring steel. It is
composed of two working coils, the ends being close coiled and ground flat. It is
rustproofed by a phosphate process and coated with lanolin. It is assembled under the cap
and seats around the top portion, with the bottom coil resting on the flange of the body.
7-36
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CONFIDENTIAL
Original AST-1160H-001-75
Fuze, Mine, Pressure, No. 4 Mk 2
FOM No. 1390-35-5-2
(C) Design Details (Continued)
Shutter assembly. The shutter assembly comprises a diaphragm, point (i.e., needle),
and collar.
? The diaphragms, made of beryllium copper, are dome-shaped disks with a
hole drilled in the center. Two diaphragms are placed one on top of the
other; the shank of the point passes through the center of the diaphragms
from underneath, after which the collar is placed over the shank, which is
then opened up with a center punch to secure it in the collar. The whole
assembly is then chamfered.
? The steel point is formed with a sharp needle point, above which is
formed a flange and a shank.
? The steel collar is cylindrical in shape with an internal chamfer formed at
both top and bottom.
Striker housing. The housing is made of electrotin-plated brass. Externally, it is
cylindrical in shape, formed plain at the top and screw-threaded below. A hole is drilled and
screw-threaded in the center of the base to accept the detonator housing. Two diametrically
opposed holes are also drilled in the base to facilitate assembly. It is bored out on several
diameters from the top, and a small hole is drilled through the center to connect with the
recess formed in the base. Eight equidistant-spaced slots are cut in the rim of the upper face.
Detonator housing. The detonator housing is also made of electrotin-plated brass.
Externally, it is cylindrical in shape and threaded to screw into the base of the striker
housing. Two diametrically opposed holes are also drilled in the base to facilitate assembly.
Internally, it is bored out on two diameters, leaving a thin diaphragm of metal at the base.
The smaller cavity at the base is filled with loose CE stemmed in, the detonator being
assembled in the larger cavity above. A circular recess is formed in the upper face to accept a
rubber sealing ring.
Detonator. This 5.7-gr (0.37-gram) "AZ" lugless (tinned copper alloy cup) detonator
is assembled in the detonator housing base downwards. After assembly, a lead/tinfoil
septum is placed over the top of the housing.
7-37
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CONFIDENTIAL
MT-1160H-001-75 Original
Fuze, Mine, Pressure, No. 4 Mk 2
FOM No. 1390-35-5-2
(C) Functioning
The fuze functions upon contact with tank tracks. The exact pressure for functioning
is not known.
7-38
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UNCLASSIFIED
Original
Fuze, Grenade
AST-1160H-001-75
nic Dday, Integral, Model (Diehl)
FOM No, 1390164-8
Neg. 515126
((JNCLASSIFIED)
Figure 744. Grenade, HE, 76 mm, Model (Diehl),
section view (U).
Neg. 515127
Figure 745, Fuze, grenade, pyrotechnic delay.
integral, Model (Diehl) (U).
7-39
UNCLASSIFIED
UNCLASSIFIED)
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UNCLASSIFIED
AST-1160/1-001-75 Original
Fuze, Grenade, Pyrotechnic Delay, Integral, Model (Diehl)
FOM No. 1390-16-4-8
(U) Description
The Diehl pyrotechnic delay fuze is an integral design used with 76-mm fragmentation
grenades (fig 7-14). It is intended for use with grenades electrically fired from a modified
smoke grenade projector mounted on armored vehicles. The fuze uses the high pressure
generated from the grenade's propelling charge for arming and initiation of the pyrotechnic
delay. Safety is provided by a safety pin (1) and a shear collar (9) which detents the
cocker-type striker (7). The illustration shown on the right (fig 7-15) is a section view of the
pyrotechnic delay and detonator assembly.
(U) Functioning
Prior to loading, the safety pin (1) must be removed. The ignition current from the
electrical firing unit flows through contact rings (2) and the cable (3) to the igniter cap (4),
which then ignites the propellant (5). The gas pressure generated by the combustion of the
propellant expands through the gas ports (6) into the remaining space in the launcher,
propelling the grenade. Simultaneously, the initial pressure shears off the collar (9),
undetcnting the cocker striker (7), which then initiates the fuze (8). The pyrotechnic delay
burns for 3 seconds, resulting in the initiation of the detonator which, in turn, detonates the
high-explosive filler of the grenade.
7-40
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UNCLASSIFIED
Original
AST-116011-001-15
Fuze, Grenade, Pyrotechnic Delay, Model DM 82
FOM No. 1390-16-9-1
Neg. 515129
(U) Description
(UNCLASSIFIED)
Neg. 515123 (UNCLASSIFIED)
Figure 7-16. Fuze, grenade, pyrotechnic delay,
Model DM 82, general and section views (U).
The Diehl hand grenade fuze, Model DM 82 (fig 7-16), was developed to insure
maximum safety to the soldier throwing the grenade. It is a pyrotechnic delay-type that
burns for 4 seconds. The DM 82 has been tested to function at -40? to +50?C with a 99.9%
reliability. It uses a 5/8-inch (15.9-mm) 11 UNC-2A thread, allowing use with most
conventional grenades. The fuze is currently being used with the FRG DM 51
HE/fragmentation grenade.
7-41
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UNCLASSIFIED
AST-1160H-001-75
Fuze, Grenade, Pyrotechnic Delay, Model DM 82
FOM No. 1390-16-9-1
(U) Unique Features
? Detonator
? Throwback safety.
(U) Functioning
Original
Neg. 515131
(UNCLASSIFIED)
Figure 7-17. Fuze, grenade, pyrotechnic delay, Model DM 82, cutaway view (U).
7-42
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UNCLASSIFIED
Original AST-1160H-001.75
Fuze,Grenade, Pyrotechnic Delay, Model DM 82
FOM No. 1390-16-9-1
(U) Functioning (Continued)
Prior to throwing the grenade, the safety cotter pin (1) is removed. After the grenade
leaves the thrower's hand, the hammer (3)* hits the DM 1024 primer cap (4) of the primer
charge as a result of pressure applied by the torsion spring (2). Simultaneously, the
protective cap (5) and safety cover (6) are thrown off.
The flash of the percussion primer initiates the delay charge (7) in the delay tube (8).
After burning for 2.5 seconds, the heat generated melts the soldering joint between the
soldering wing (9) and the delay tube (8) and detonator holder (10). This allows the
pressure spring (11) to push the detonator holder rearward against the booster (13).
After the delay charge has burned out (4.0 seconds), the flash penetrates two bores of
the throttle clip (14), bending the flap valve (15) up, enabling the flash to initiate the
detonator (12) and, in turn, the booster (13).
*Note. The bead against which the hammer (3) rests prevents the hammer from completing its rotation and hitting the
pnmcr until the safety lever reaches an opening angle of 6e.
7-43
(Reverse Blank)
UNCLASSIFIED
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UNCLASSIFIED
Original
CAP
AST-1160H-001-75
Fuze, Grenade, Model L25A2
FOM No. 1390-354-2
DELAY PELLET
Figure 7-18. Fuze, grenade, Model L5A2, section view (11).
(U) Description
The L25A2 fuze (fig 7-18) was designed for use with the controlled-fragmentation
grenade, Model L2A1. The fuze incorporates a conventional lever release mechanism with a
safety pin and a percussion cap which fires a pyrotechnic delay that burns for 4.3 ?-0.3
seconds. The grenade with its fuze is marketed by the Director of Sales, Ministry of Defense,
SStuart House 23-25 Soho Sq., London WIV5FS.
7-45
(Reverse Blank)
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UNCLASSIFIED
Original AST-1160H-001-75
Igniter, Pull type, Model Mk F2
FOM No. 1375-17-3-1
(U) Description
(UNCLASSIFIED)
Figure 7-19. Igniter, pull type, Model Mk F2,
general view (U).
This pull-type igniter (fig 7-19) contains two safety devices to insure safety in
transport, storage, and handling. It can initiate standard mines and booby traps by means of
a percussion primer. Two versions of this igniter exist: the metal version, now in production
and in use by the French Army, weighs 48 grams (0.10 lb); its diameter is 26.6 mm (1.05 in)
and its overall height is 63.5 mm (2.5 in). A nonmetallic, nondetectable version is
undergoing standardization tests. This igniter is manufactured by SociEte E. Lacroix, Muret,
France.
7-47
.(Reverse Blank)
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UNCLASSIFIED
Original
AST-1160H-001-75
Igniter, Nondetectable, Model ALBACID
FOM No. 137547-3-2
Figure 7-20. igniter, nondetectable, Model ALBACID, general view (U).
(U) Description
This omnidirectional swinging igniter (fig 7-20) is initiated by a swinging antenna,
which delays functioning of the fuze until the tank hull is directly above the mine, thus
increasing the effectiveness of the explosive charge. When used with Model 51 and 52
nondetectable antitank mines, this igniter makes them effective as tank belly mines. The
igniter weighs approximately 210 grams (0.46 lb); is approximately 110 mm (4.33 in) in
diameter and 105 mm (4.13 in) long, and extends 55 mm (2.17 in) above the mine body.
The antenna, which extends 0.64 meter (25 in) above the top of the mine, can be locked at
its base to provide safe handling. All components are made of plastic, sealed against adverse
environmental conditions. This igniter was under development in 1973 by Societe
Alsatienne d'Etudes et d'Exploitation (ALSETEX).
7-49
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Original
AS7-116011-001-75
?
Firing Device, Pull type, Nondetectable, Model ALSETEX
FOM No. 1375-17-3-3
Neg. 516987
(U) Description
(UNCLASSIFIED)
Figure 7-21. Firing device, pull type, nondetectable,
Model ALSETEX, general view (U).
This device (fig 7-29) has a plastic body, with all pyrotechnic elements hermetically
sealed to prevent deterioration in storage or in service. Overall length including the threaded
portion is 72 mm (2.82 in); the visible (external) portion is 64 mm (2.52 in). Diameter is 25
mm (2.95 in) and weight is approximately 20 grams (0.044 lb). This pull-type firing device
can be used with all types of metallic or nonmetallic mines or other explosive devices with a
standard fuze well. Safety is provided by a safety pin, which can be removed at a distance.
This device is under development by the Societe Alsacienne d'Etudes et d'Exploitation
(ALSETEX).
(U) Functioning
After arming, the device functions when the trip wire is pulled.
7-51
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Original AST-1160H-001-75
Section VIII.
DELAY-ARMING MECHANISMS,
TIMERS, AND S&A DEVICES
8-1
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Original AST-1160H-001-75
Section VIII.
DELAY-ARMING MECHANISMS, TIMERS, AND S&A DEVICES
GENERAL
(U) Time mechanisms, delay-arming mechanisms, and S&A devices are used in a
number of different fuzes. This section provides a more detailed description and functioning
of 'Components which are cross referenced to the individual fuze described in other sections
of the handbook.
8-3
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Original
FOM No.
INDEX
Nomenclature*
Delay-Arming Mechanisms
AST-1160H-001-75
Page
1390-16-10-4
Delay-Arming Mechanism for Fuze, PD, Model AZ DM 111A3 .
8-9
1390-35-10-3
Delayed-Arming Shutter, No. 3B
8-15
1390-35-10-4
Delayed-Arming Shutter, No. 4A
8-21
Timers
1390-16-10-3
Mechanical Timer,-60 seconds, Model
Junghans
8-27
1390-35-10-1
Clockwork Time Mechanism, 80 seconds, No. 1
8-31
1390-35-10-2
Clockwork Time Mechanism, 43 seconds, No. 4
8-43
S&A Devices
1390-17-10-2
S&A Device for VT Fuze, Model FU-RA-F1
8-45
1390-17-10-3
S&A Device for French Crotale SAM
8-47
1390-20-10-1
S&A Device for VT Fuze, Model NVT-227A1
8-53
1390-35-10-5
S&A Device, Model K40A1
8-57
'All fuec
lomenchituro..ire UNCLASSIFIED.
8-5
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Original
AST-1160H-001-75
LIST OF ILLUSTRATIONS
Figure Title* Page
Delay-Arming Mechanisms
8-1
Interface of delay-arming mechanism components for
fuze, Model AZ DM 111A3
8-9
8-2
Interface of delay-arming mechanism components for
Rize, Model AZ DM 111A3, unarmed position
8-11
8-3
Interface of delay-arming mechanism components for
fuze, Model AZ DM 111A3, armed position
8-13
8-4
Delayed-arming shutter, No. 3B, external view
8-15
8-5
Delayed-arming shutter, No. 3B, exploded view
8-16
8-6
Delayed-arming shutter, No. 3B, functioning view
8-19
8-7
Delayed-arming shutter, No. 4A, external view
8-21
8-8
Delayed-arming shutter, No. 4A, exploded view
8-22
8-9
Delayed-arming shutter, No. 4A, functioning sequence
8-25
Timers
8-10
60-second mechanical timer, Model Junghans,
interface of components
8-27
8-11
60-second mechanical timer, Model Junghans,
timer and setback device
8-29
8-12
80-second mechanical timer, No. 1, exploded view
8-31
8-13
80-second mechanical timer, No. 1, functioning views
8-40
8-14
43-second mechanical timer, No. 4, contour,
exploded, and functioning views
8-43
S&A Devices
8-15
S&A device for VT fuze, Model TRT, section
view
8-45
8-16
Crotale S&A device, bottom view
8-47
8-17
Detonator/pressure plug assembly for Crotale S&A device
8-48
8-18
Crotale S&A device, section view
8-49
8-19
Crotale S&A device, functioning sequence
8-50
8-20
Turbine generator device for fuze, Model
NVT-227A1
8-53
*All Figure titles are UNCLASSIFIED.
8-7
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AST-1160H-001-75 Original
Figure Title* Page
8-21
S&A device for fuze, Model NVT-227A1, section
view, unarmed position
8-54
8-22
S&A device for fuze, Model NVT-227A1, section
view, armed position
8-55
8-23
Rapier S&A device, Model K40A1
8-57
8-24
Electrical delay switch for Rapier S&A device
8-58
8-25
Expansive motor for Rapier S&A device
8-58
*All figure titles are UNCLASSIFIED.
8-8
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Original AST-1160H-001-75
Delay-Arming Mechanism for
Fuze, PD, Model AZ DM 111A3
FOM No. 139046404
DELAY-ARMING MECHANISMS
(U) General
The delay-arming mechanism for the AZ DM 111A3 (FOM No. 1390-16-1-9-1) consists
of an interface of the fuze's firing-pin assembly, escapement, rotor, selector stud, and detent
system. The escapement, rotor, and detent system of the AZ DM 111A3 is similar to that of
the AZ DM 111 and AZ DM 111A1 fuzes (FOM Nos. 1390-16-1-1 and 1390-16-1-2). The
AZ DM 111A3 differs in that it employs a protruding-type firing-pin assembly which
permits supersensitivity functioning upon impact. The fuze is considered so sensitive that it
will function when grazing thin branches or brushwood after the fuze has been armed. The
protruding-type striker ensures a high-fragmentation effect from the high-explosive
projectiles it is used with. Except for this action, the AZ DM 111A3 fuze functions like the
AZ DM 111 and AZ DM 111A1 fuzes.
(U) Design Details
(UNCLASSIFIED)
Figure 8-1. Interface of delay-arming mechanism components
for fuze, Model AZ DM 111A3 (U).
8-9
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UNCLASSIFIED
AST11601400145 Original
Delay-Arming Mechanism for
Fuze, PD, Model AZ DM 111A3
FOM No. 1390-16-104
(U) Design Details (Continued)
Figure 8-1 illustrates the interface of the escapement, firing-pin assembly, rotor,
selector stud, and detent system.
The escapement run-off safety (shown on the left) is provided by the ball release pin
(L) and the safety pin (m), which prevents the escapement lever (k) from oscillating. This, in
turn, prevents the rotor (o) containing the delay or SQ detonators from rotating to the
in-line position. As an additional safety feature of the escapement, the firing pin (a) engages
in a matching hole in the rotor (o). The firing pin (a) is pressed rearward against the
compression spring (r) by the interlock of the firing-pin recess and the radial slot in the
firing-pin locking lever (b).
The firing-pin locking lever (b), which is swivel mounted and preloaded by the torsion
set-screw spring (c), is locked in place by the pressure of the trigger lever (f) against the
safety pin (m). In this position, the firing-pin locking lever (b) cannot release the firing pin
(a), thereby preventing it from moving forward.
The setback-type pins (m and L) represent a double safety mechanism. The pins are
connected in series by means of a locking ball (n). When the projectile is fired, the ball
release pin (L) is first pushed rearward. Due to the cone on this detent pin, the locking ball
(n) can release the safety pin (m) which then moves rearward. The trigger lever (f) and the
escapement are then released.
As shown on the right of figure 8-1, the engagement of the pull wire (C) in the recess
of the ball release pin (L) blocks the movement of this detent pin in the axial direction. The
pull wire (C) provides a positive safety during handling. It must be removed prior to firing.
Other components shown in figure 8-1 include the projecting striker head (A), the
escape wheel (h), the selector stud (E) and its stop pin (e), the booster lead (g), and the
tetryl booster (F).
8-10
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UNCLASSIFIED
Origins
(U) Design Details (Continued)
AST-1150H-001-75
Delay-Arming Mechanism for
Fuze, PD, Model AZ DM 111A3
FOM No. 1390-16-10-4
(UNCLASSIFIED)
Figure 8-2. Interface of delay-arming mechanism components for
fuze, Model AZ DM 111A3, unarmed position (U).
Figure 8-2 depicts additional design details of the firing-pin assembly, escapement,
rotor, selector stud, and dctent system interface. The safety leaf (m1) (shown at right)
mounted on the safety pin (in) engages a deepened toothed space of the rotor (o) and
8-11
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UNCLASSIFIED
MT-1160H-001-75 Original
Delay-Arming Mechanism for
Fuze, PD, Model AZ DM 111A3
FOM No. 1390-16-10-4
(U) Design Details (Continued)
consequently prevents it from rotating to the armed position. This ensures, from a
production standpoint, that the rotor (o) can only be mounted in the unarmed position.
The firing-pin locking lever (b) resting against the trigger lever (f) and the pressure of
the trigger lever against the safety pin (m) are clearly visible.
If the fuze is set to OV (superquick action), the selector stud (E) is in the position
depicted by its bisected tap (Es ). In this position, when the rotor (0) is disengaged to rotate
to the armed position, it can only rotate until the stop pin (Os) meets the bisected tap (Es )
of the selector. In this position, the OV detonator is in line with the firing pin.
If the selector stud (E) is set for MV (delay action), the rotation of the rotor (0) to
the armed position is not obstructed by the stop pin (Or) and continues until it is locked by
the interrupted gearing of the rotor (0). The MV detonator is then inline with the firing pin
(i.e., the fuze is armed).
Shown at the right in figure 8-2 is the rotor (0) with the MV detonator (S). This view
depicts the firing pin engaging a hole in the rotor. Also depicted is the rotors torsion spring
(P) which drive the escapement and consequently causes the rotor to rotate to the armed
position after it has been disengaged.
Figure 8-3 depicts the interface of the most important fuze components in the armed
position.
Following a minimum acceleration of approximately 500 g's during a period of at least
0.01 second, the double safety mechanism (i.e., safety pin [m] , locking ball [n] , and ball
release pin [Id ) is disengaged. The locking spring (q) engages the recess of the safety pin
(m). The ball (n) locks the ball release pin (L). In this manner both detent pins are retained
in their rear position.
Together with the detent pin (m), the safety leaf (m1) has also been disengaged from
the rotor gearing (see view at right in figure 8-3). In addition, the triKer lever (f) is also
released. The firing-pin locking lever (b) is free to turn, and the firing pin (a) is released. It
jumps forward together with the striker head (A) as the result of the expansion of
8-12
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Original
(U) Design Details (Continued)
AST-116014-001-75
Delay-Arming Mechanism for
Fuze, PD, Model AZ DM 111A3
FOM No. 1390-16-10-4
(UNCLASSIFIED)
Figure 8-3. Interface of delay-arming mechanism components
for fuze, Model AZ DM 111A3, armed position (U).
compression spring (r). The rotor (0) has also been released by the firing pin (a) and within
approximately 1 second rotates to the preset OV or MV position (i.e., 50 or delay action).
The fuze is armed within 1.01 seconds.
8-13
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AST-1160H-001-75 Or igina
Delay-Arming Mechanism for
Fuze, PD, Model AZ DM 111A3
FOM No. 1390-16-10-4
(U) Design Details (Continued)
Direct-action (i.e., SQ) ignition requires a minimum energy of 1.8 kg/cm on the
projected or protruding striker. The same amount of energy is achieved on a 1-mm
cardboard disk (specific weight-0.65 kg/cm3) at a projectile velocity of 45 m/s. On the same
target, the direct-action ignition requires a minimum energy of 3.6 kg/cm, which
necessitates a projectile velocity of 60 m/s. Below a projectile velocity of 350 mls, the air
drag is not sufficient to prevent arming of the fuze.
Delay-action funceioning occurs 0.05 second after impact.
The explosive train runs from detonators (s or t) through the booster lead (g) to the
booster charge (F) (see fig 8-1).
8-14
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CONFIDENTIAL
Original AST-1160H-001-75
Delayed-Arming Shutter, No. 3B
FOM No. 1390-35-10-3
- LOCKING PLATE ENGAGED WITH
SPIGOT OR PLUNGER
SAFETY GAUGING HOLE FOR GAUGING SAFETY POSITION
OF SHUTTER WHEN UNIT IS ASSEMBLED IN FUZE
Figure 8-4. Delayed-arming shutter,
No. 311, external view (U).
POSITIONING SLOT FOR
ASSEMBLY INTO FUZE
(CONFIDENTIAL)
(C) General
The No. 311 delayed-arming shutter (fig 8-4) is a mechanical safety unit. When it is
assembled to a fuze, it insures that the projectile will not arm until it has travelled a
predetermined distance from the weapon. Although this shutter is obsolete, it is
incorporated in this handbook for review by fuze designers.
8-15
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CONFIDENTIAL
AST-1160H-001-75 Original
Delayed-Arming Shutter, No. 3B
FOM No. 1390-35-10-3
(C) Design Details
0