General Electric YJ93: Difference between revisions
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[[Category:Turbojet engines 1950–1959]] |
[[Category:Turbojet engines 1950–1959]] |
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[[Category:General Electric aircraft engines]] |
[[Category:General Electric aircraft engines|YJ93]] |
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[[Category:Abandoned military aircraft engine projects of the United States]] |
[[Category:Abandoned military aircraft engine projects of the United States]] |
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Revision as of 13:19, 7 December 2012
| 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 | none; two XB-70 Valkyrie prototypes only |
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 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]
Specifications (GE4/J5P)
General characteristics
- Type: Turbojet
- Length: 6.2 m (237 in)
- Diameter: 1.33 m (52.5 in)
- Dry weight:
Components
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/h.lbf[convert: unknown unit][5] (1.800 lb/h.lbf[convert: unknown unit] with afterburner)[5]
See also
Related development
Comparable engines
Related lists
References
- ^ a b c Jenkins, Dennis R. and Tony R. Landis. North American XB-70A Valkyrie WarbirdTech Volume 34. North Branch, Minnesota: Specialty Press, 2002. ISBN 580070566.
- ^ 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
- ^ a b c Military Turbojet/Turbofan Specifications
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