General Electric YJ93

YJ93

YJ93-GE-3 engine at National Museum of the United States Air Force
Type	Turbojet
National origin	United States
Manufacturer	General Electric Aircraft Engines
Major applications	North American XB-70 Valkyrie
Developed into	General Electric GE4

YB-58 at Edwards AFB with GE J93 engine pod

The General Electric YJ93 turbojet engine was designed as the powerplant for both the North American XB-70 Valkyrie bomber and the North American XF-108 Rapier interceptor. The YJ93 was a single-shaft axial-flow turbojet with a variable-stator compressor and a fully variable convergent/divergent exhaust nozzle. The maximum sea-level thrust was 28,800 lbf (128 kN).^[1]

Design and development

The YJ93 started life as the General Electric X275, an enlarged version of the General Electric J79 turbojet. This evolved to the X279 when Mach 3 cruise became a requirement, and ultimately became the YJ93.^[2]

The engine used a special high-temperature JP-6 fuel. The six YJ93 engines in the XB-70 Valkyrie were capable of producing a thrust to weight ratio of 5, allowing for a speed of 2,000 mph (3,200 km/h) (approximately Mach 3) at an altitude of 70,000 feet (21,000 m).^[3]

The XF-108 interceptor was cancelled outright and the B-70 project was reoriented to a research project only.^[4]

Applications

Specifications (YJ93)

Data from

General characteristics

Type: Turbojet
Length: 6.2 m (237 in)
Diameter: 1.33 m (52.5 in)
Dry weight: 3800lb (1,728 kg)

Components

Compressor: 11-stage axial
Turbine: Two-stage axial
Fuel type: Special high-temperature JP-6 Fuel

Performance

Maximum thrust: 19,000 lbf (85 kN)^[1] (28,800 lbf (128 kN) with afterburner)^[1]
Air mass flow: 275 lb/s (125 kg/s)^[5]
Specific fuel consumption: 0.700 lb/(lbf·h) or 19.8 g/(kN·s)^[5] (1.800 lb/(lbf·h) or 51.0 g/(kN·s) with afterburner)^[5]
Thrust-to-weight ratio: 7.58（with afterburner）

References

Wikimedia Commons has media related to General Electric YJ93.

1 2 3 Jenkins, Dennis R. and Tony R. Landis. North American XB-70A Valkyrie WarbirdTech Volume 34. North Branch, Minnesota: Specialty Press, 2002. ISBN 1-58007-056-6.
↑ Jenkins, Dennis R. and Tony R. Landis. Valkyrie: North American's Mach 3 Superbomber. North Branch, Minnesota: Specialty Press, 2005. ISBN 1-58007-072-8.
↑ National Museum of the USAF
↑ NB-58A Testbed for General Electric J93
1 2 3 Military Turbojet/Turbofan Specifications

General Electric aircraft engines

Turbojets	CJ610 CJ805 GE1 GE4/J5P J31 J33 J35 J47 J73 J79 J85 J87 YJ93 J97 YJ101

Turbofans	CF6 CF34 CF700 CFE738† CFM56/F108† CJ805-23 F101 F110 F118 YF120 F136† F404/F412/RM12 F414 GE90 GEnx GP7000† HF120† LEAP† Passport TF34 TF39 RM12

Turboprops/Turboshafts	GE27 GE36 GE38-1B H80 T31 T58/CT58 T64/CT64 T407 T408 T700/CT7 Advanced Turboprop

Aeroderivative gas turbine engines	LM500 LM1500 LM1600 LM2500 LM6000 LMS100 LV100†

† Joint development aeroengines

United States military gas turbine aircraft engine designation system

Turbojets	J30 J31 J32 J33 J34 J35 J36 J37 XJ38 J39 J40 XJ41 J42 J43 J44 J45 J46 J47 J48 XJ49 J51 J52 J53 J54 J55 J56 J57 J58 J59 J60 J61 J63 J65 J67 J69 J71 J73 J75 J79 J81 J83 J85 J87 J89 J91 YJ93 J95 J97 J99 J100 YJ101 J102 J400 J401 J402 J403 J700

Turboprops/ Turboshafts	T30 T31 T33 T34 T35 T36 T37 T38 T39 T40 T41 T42 T43 T44 T45 T46 T47 T48 T49 T50 T51 T52 T53 T54 T55 T56 T57 T58 T60 T61 T62 T63 T64 T65 T66 T67 T68 T69 T70 T71 T72 T73 T74 T76 T78 T80 T100 T101 T400 T405 T406 T407 T408 T700 T701 T702 T703 T706 T708 T800

Turbofans	TF30 TF31 TF32 TF33 TF34 TF35 TF37 TF39 TF41 F100 F101 F102 F103 F104 F105 F106 F107 F108 F109 F110 F112 F113 F117 F118 F119 YF120 F121 F122 F124 F125 F126 F127 F128 F129 F135 F136 F137 F138 F400 F401 F402 F404 F405 F408 F412 F414 F415

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