General Electric YJ93: Difference between revisions
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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 (approximately Mach 3) at an altitude of 70,000 feet.<ref>[http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=876 National Museum of the USAF]</ref> |
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The XF-108 interceptor was cancelled outright and the B-70 project was reoriented to a research project only.<ref>[http://home.att.net/~jbaugher2/b58_9.html NB-58A Testbed for General Electric J93<!-- Bot generated title -->]</ref> |
The XF-108 interceptor was cancelled outright and the B-70 project was reoriented to a research project only.<ref>[http://home.att.net/~jbaugher2/b58_9.html NB-58A Testbed for General Electric J93<!-- Bot generated title -->]</ref> |
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Revision as of 01:38, 10 December 2010
| 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 | XB-70 Valkyrie |
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.[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 (approximately Mach 3) at an altitude of 70,000 feet.[3]
The XF-108 interceptor was cancelled outright and the B-70 project was reoriented to a research project only.[4]
Specifications
- Thrust dry: 19,000 lbf[1]
- Thrust wet: 28,800 lbf[1]
- SFC dry: 0.700 lb/(lb.h)[5]
- SFC wet: 1.800 lb/(lbf.h)[5]
- Core airflow: 275 lb/s[5]
See also
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
External links
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