COMPARISON OF J58 DEVELOPMENT OBJECTIVES WITH CURRENT PRODUCTION-TYPE ENGINES

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP90B00170R000200290005-7
• Release Decision: RIFPUB
• Original Classification: K
• Document Page Count: 12
• Document Creation Date: December 21, 2016
• Document Release Date: June 2, 2008
• Sequence Number: 5
• Content Type: REPORT

Approved For Release 2008/06/02 : CIA-RDP90B00170R000200290005-7
COMPARISON OF J58 DEVELOPMENT
OBJECTIVES WITH CURRENT
PRODUCTION-TYPE ENGINES
J57 and J75
JT 11 D-20
Mach Number
2.0 for 15 min (J75 Only)
3.2 (Continuous)
Altitude
55,000 ft
100,000 ft
Compressor Inlet
250?F (J75 Only)
800? F
Temperature
Turbine Inlet
1750? F (Takeoff)
2000?F
Temperature
1550?F (Cruise)
Maximum Fuel Inlet
110-130?F
300 ? F
Temperature
Maximum Oil Inlet
250? F
550? F
Temperature
Thrust/Weight Ratio
4.0
5.2
Military "Operation
30-min Time Limit
Continuous
Afterburner Operation
Intermittent
Continuous
AV 213217
812503
gen-917
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 Approved For Release 2008/06/02 : CIA-RDP90B00170R000200290005-7
INLET AND ENGINE
AIRFLOW MATCH
Corrected
Airflow
o Mach No. +
AV 216388
812004
bet 178
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NET THRUST COMPARISON
Bleed Bypass Cycle vs Turbojet Cycle
Percent
SLTO
Thrust
Flight Mach Number --~
AV 158945
812503
gen-911
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 Approved For Release 2008/06/02 : CIA-RDP90B00170R000200290005-7
HEATED ENVIRONMENT TEST STAND
100,000
90,000
Altitude - ft 1 80,000
70,000
;,, '0. 60,000
I I I
2.4 2.8 3.2 3.6 4.0
Mach No.
AV 218314
810604
gn1-449
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AIR FLOW PATTERNS
Static Aircraft
Spike Forward
Centerbody Bleed Suck-in Doors Open
Bypass Doors Open
Tertiary Doors Open
Ejector Flaps Closed
AV 219006
812503
gen-914
Approved For Release 2008/06/02 : CIA-RDP90B00170R000200290005-7
 Approved For Release 2008/06/02 : CIA-RDP90B00170R000200290005-7
AIR FLOW PATTERNS
High Speed
Cowl Bleed Supplies
Centerbody Bleed
Overboard
Engine Cooling Air ,--Suck-In Doors Closed
Spike in Aft Design
Bypass Doors Closed
Tertiary Doors Closed
Position. If Inlet
on Standard Day -
External Ejector
Should Unstart Spike
Open as Required
Flaps Full Open
Moves Forward To
To Position Shock
Restart the Inlet
or.Restart Inlet
AV 219007
812503
gen-915
Approved For Release 2008/06/02 : CIA-RDP90B00170R000200290005-7
 Approved For Release 2008/06/02 : CIA-RDP90B00170R000200290005-7
ENGINE MOUNT
`," Before
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 Approved For Release 2008/06/02 : CIA-RDP90B00170R000200290005-7
ENGINE MOUNT
;'? After
Approved For Release 2008/06/02 : CIA-RDP90B00170R000200290005-7
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EGT VERNIER CONTROL SYSTEM
EGT ERROR GAGE OPERATING MODES
Derichment Energized
EGT Over Limit
400 Hz Power Off
Operation Normal
EGT Under Limit
AV 218261
811004
bt3-966
Approved For Release 2008/06/02 : CIA-RDP90B00170R000200290005-7
 Approved For Release 2008/06/02 : CIA-RDP90B00170R000200290005-7
Approved For Release 2008/06/02 : CIA-RDP90B00170R000200290005-7 X`'Q
 Approved For Release 2008/06/02 : CIA-RDP90B00170R000200290005-7
 Approved For Release 2008/06/02: CIA-RDP90B00170R000200290005-7
Approved For Release 2008/06/02 : CIA-RDP90B00170R000200290005-7