VARIABLE-PITCH PROPELLORS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000600060393-0
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 4
• Document Creation Date: December 22, 2016
• Document Release Date: August 17, 2011
• Sequence Number: 393
• Publication Date: December 7, 1954
• Content Type: REPORT

Sanitized Copy Approved for Release 2011/08/18: CIA-RDP80-00809A000600060393-0
SUBJECT Variable-Pitch Propellors (IM)
.N ~N N/.~IN'7N Y.IINN N~NN
N NI ..IN..?..... N?u. /N NNp. Y/ fM. U. NtlIN....
w?.. a I.I .... u?n.. NIN... Ib ?.N..N.I.. 1? N?..
~.,IIN .. IN ...?~.?? N ??NNNI ?? "is to .NN. 16
.INISI... N \N. ?.. N..?.?.IIN of., .... I. ..NIN N?. ,
Sanitized Copy Approved for Release 2011/08/18: CIA-RDP80-00809A000600060393-0
CLASSIFICATION ; y =
CENTRAL INT' ;~.NCE AGENCY
INFORMA'"."ION REPORT.,
f~.
NO. OF ENCLS.
IUSTCD scwWM
THIS IS UNEVALUATED INFORMATION
I
50X1-HUM
1. In entreat to Sc?,, propsUors haeiai blsdss fiaeL in 028 position, tM variable-
pitch propellor bee b3sdss rhioh Na Us turssd on twir &m., two ehsst41 the
pitch of the propeLUr.
2. slbs Mnehsais thst ooetrols the twain of the b1eAes is boatel in tbs hollow
propellor hob. ftls asehsaiw is osmosotst vitb s actor in tM sagias row by
awes of s oo2tr01 rsaalai tlra tM 1d13aw psspsilor Blatt. lb* pitch Gan be
chalet aitbsr fras tM eatias rsw or diXSSW troa tls bridge.
3. A obsnpabls-p+toh propellor bad 11a ffollawiap bsalo stvwtspa:
(A) '!M awls esiias of Of MAP sac bb set at $ essfais aysbsr of
revo1stioss per alum t1 to stress as tbs eaii" osa be
ragdatsS by fsws of the vsr1d "i,91 M psi Ll
(a) with /1s esr1ab)ayili pavpsUa7 it A. no "swssry to reverse
the MIAs wit". MR 110 Game of stsaa 1ol1ie edIlliw it is not
"ssdssey to bas s siwlsi iwwm NMbisii
(C) of " dsAs: 1y teaid low mmove "mmew from a* br~
sse" fir tug spsist M, taw
red
k. >rpsallL ilsb swsisUsas an $Ltu cwt is via an is ra anrOaat flast of as
ear b go a" Ogg w snips bsvisi i doss st raat'.hs
t i 01 (SbAma m% s i s i S M a p s s r R O A N ~ s a s h e a t 0e001-
1A^s" v & A M a t van" i W e " i . ,llMssb r , f i ' E "mum act alumm"aae.
slydse pasie1ldws an s2ss bslas -its sjdd-II w MAP 11 rswtre d> ._I. 1 w-
sbility no e/ irdly balls, MIWw?sas[s pNSasile ablps, ell. sw slwe slant
is wasylai w sas* at as lsw~I-am a 11a w at Vint". tteb 1awe33ors.
CtAS31l1CATION -#-1@ 28 !
50X1-HUM
 Sanitized Copy Approved for Release 2011/08/18: CIA-RDP8O-00809AO00600060393-0
5. It met be noted that a whole eeriee of other measeuw is also being carried out in the
field of Increasing the effectiveness of screw propellors, amain mostly in the River Fleet.
For exemle, experiments are being and. with counter-propellors, Dressuure on the screen,
and t el by-passes throwO the hill of the ship. late we of these devices can increase
the efficiency of as wags' teat 10 to 30.
6. So theoretleal basis of the variable.pitch propellor (fah) can be described as follows:
or ilusof Now. the emteroa'l characteristics are one
this respect the effective power of
UP Romig ~ or speft lye on pmt of the ipemdsot ls vbl& hers Win be the
"am, io, Is. f(u). !ba eo[teraal characteristics
ae r of rsvo]atioas of the' 1, ,
o: the operational cepaeitiss of engines are represented by a series of curves
which haws areas LQsatad beneath them, Son 4ree give the geometrical place
of all operational ospacities for given nl'ert of see^olntions. Depending on
the fift lapo.ed by aavlgatfoaal coalitions of a given ship in opera-
tion, the following aspect. of eztsrn l characteristics may be used: (see
figure #1 below)
(1) She period of greatest operssioa.l capaosty (Ow" d) is a limited
ties, not more an eve-as" hear.;
(2) Nu a+ set* (sue 3) OWily oespapoaie With the "rated" oapa-
?ity (gsaMmsts.L by tY ss~iw misml -hex r for epesi1i4L eoaditioas)
amt i. ssas~ltsrad sa gssatl.a Wer as esllattsd posed of tom
(3) or teal to sit ) i. ?.ee~~i het wiwg rea~e:1 reeling
. for ?11 - - - - eelstteS of as eerw aeeord-
-
Ong - . - _ ----" -- ?---- -?- e
dpr..sii is w e.sw. MW PM 1
of as m?m.ngso-as ?W iw
6s1sei1y at aw. MV! ii We .bssmiJMalabia d MU to 09 al to w poser absorbed
by -IM MPN w 1ta-.Nils Masts ?t wee 'se> oieeti?ae. 'lie r srs3'
of up mow is fiRM 60 1- tissl$ or by NO of tosel as0el teats is a
used ball. u, an ISIsUSI ?sa 1e f91AN 111 1? osrr o>Mi-
?si pspss.s 1t f6i faliSVlmp wtbsie gains 'a ?s^H St dlsp1Me^ Ut
tie pmwe gbr.gb$L IV s ?am/IM/1Lfri sow Is ~sspsas>tiesaM is w ado of the
,r,e at Mwml+stfer of a* snow (.e 4w et to srlp).Wrs, is same
... 3W-Or-
WAS pss be s, OWING .lease is , e Is pmssblu amt is special men
ft-=Aft
rift ?se sg; 4UMSr t1Mw so awsr ssatiss, it its* meal be wt
!'be IM of as of isue ~ff~m = !bw as W o parslala,
own 01"t, " 00 ON~ Ia it w give 9M tine is of
Micas:'
Sanitized Copy Approved for Release 2011/08/18: CIA-RDP8O-00809AO00600060393-0
 Sanitized Copy Approved for Release 2011/08/18: CIA-RDP80-00809A000600060393-0
possible operational eapaaitiM of a ship .Miss (SAL VPOD the ship aed
typo of .amiss) lie. bebveea the =tesnal e4,taetasiatis'of the data op~zi-
ti p Pam (eerie 2) aM the ?trw chracteritic (cum 6). ben the engine
aorta lirsetly on tie ?crl* ehip'p engbo, as ens be Men by the diamraa,
daeelop tea^aNielre r {w .tats by sham a, b,
08bw In faft a"* . tr-s satwd
eaesot to neM is + opeieat t 'oal ca~ob
terblss cos itisa tint ii, at? a eh etlrletic iater-
eeeti . ). TA all resaisios :, I 10,6&M L o! ei