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 J79-X275, an enlarged version of the General Electric J79 turbojet with "275" meaning Mach 2.75, the engine's target operating speed.[2] This design evolved into the X279 when Mach 3 cruise became a requirement, and ultimately became the YJ93.[3]

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 5:1 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).[4] The first engine went on test in September 1958 and featured advanced technology achievements such as electrolytically drilling longitudinal air cooling holes in the turbine blades.[2]

The XF-108 interceptor was cancelled outright, and the B-70 project was re-oriented to a research project only.[5]

Variants

J93-GE-1
24,800 lbf (110 kN) thrust with afterburner.[6]
J93-GE-3
Production variant produced in small numbers for the North American XB-70 Valkyrie program.
J93-GE-3R
Variant with thrust reverser, 27,200 lbf (121 kN) thrust with afterburner.[7]
J93-GE-3AR
Variant intended for the North American XF-108 Rapier.

Applications

Specifications (J93-GE-3)

Data from Aircraft engines of the World 1966/77,[8] Military Turbojet/Turbofan Specifications,[9] North American XB-70A Valkyrie[1]

General characteristics

Components

Performance

See also

Related development

Comparable engines

Related lists

References

Wikimedia Commons has media related to General Electric YJ93.
  1. ^ a b Jenkins, Dennis R.; Landis, Tony (2002). North American XB-70A Valkyrie. North Branch [USA]: Specialty Press Publishers and Wholesalers. ISBN 1-58007-056-6.
  2. ^ a b Eight Decades of Progress : A Heritage of Aircraft Turbine Technology. GE Aircraft Engines. 1990. p. 117. LCCN 90082948.
  3. ^ 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.
  4. ^ National Museum of the USAF Retrieved: December 21, 2016
  5. ^ NB-58A Testbed for General Electric J93 Archived 2008-07-24 at the Wayback Machine
  6. ^ "Characteristics Summary: F-108A" (PDF). US Air Force. 2 May 1958. Retrieved 15 December 2018.
  7. ^ "Characteristics Summary: F-108A" (PDF). US Air Force. 15 December 1958. Retrieved 15 December 2018.
  8. ^ Wilkinson, Paul H. (1966). Aircraft engines of the World 1966/77 (21st ed.). London: Sir Isaac Pitman & Sons Ltd. p. 83.
  9. ^ "Military Turbojet/Turbofan Specifications". www.jet-engine.net. Archived from the original on 2 October 2011. Retrieved 31 December 2017.
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