General Electric YJ93: Difference between revisions
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The XB-70 aircraft never had a thrust to weight ratio of 6. I'm not sure if this was meant to be the aircraft itself or the YJ-93 example engines used to power the two development prototypes of the jet. |
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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 |
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 0.3 at loaded takeoff weight, allowing for a speed of {{convert|2000|mph|km/h|abbr=on}} (approximately Mach 3) at an altitude of {{convert|70000|ft}}.<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 17:04, 21 December 2016
| 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 |
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 0.3 at loaded takeoff weight, 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
- Convair NB-58A Hustler (testbed)
- North American XB-70 Valkyrie
- North American XF-108 Rapier (intended)
Specifications (YJ93)
Data from [citation needed]
General characteristics
- Type: Turbojet
- Length: 6.2 m (237 in)
- Diameter: 1.33 m (52.5 in)
- Dry weight: 3800lb (1,728 kg)
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/(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）
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 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
- ^ a b c Military Turbojet/Turbofan Specifications