The General Electric YJ93

turbojet The turbojet is an airbreathing jet engine which is typically used in aircraft. It consists of a gas turbine with a propelling nozzle. The gas turbine has an air inlet which includes inlet guide vanes, a compressor, a combustion chamber, and ...

engine was designed as the powerplant for both the

North American XB-70 Valkyrie The North American Aviation XB-70 Valkyrie is a retired prototype version of the planned nuclear-armed, deep-penetration supersonic strategic bomber for the United States Air Force Strategic Air Command. Designed in the late 1950s by North A ...

bomber and the

North American XF-108 Rapier The North American XF-108 Rapier was a proposed long-range, high-speed interceptor aircraft designed by North American Aviation intended to defend the United States from supersonic Soviet Union, Soviet strategic bombers. The aircraft would hav ...

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 .

Design and development

The YJ93 started life as the General Electric J79-X275, an enlarged version of the

General Electric J79 The General Electric J79 is an axial-flow turbojet engine built for use in a variety of fighter and bomber aircraft and a supersonic cruise missile. The J79 was produced by General Electric Aircraft Engines in the United States, and under lice ...

turbojet with "275" meaning Mach 2.75, the engine's target operating speed. This design evolved into the X279 when

Mach The Mach number (M or Ma), often only Mach, (; ) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a Boundary (thermodynamic), boundary to the local speed of sound. It is named after the Austrian physi ...

3 cruise became a requirement, and ultimately became the YJ93. B58j93pod

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 (approximately Mach 3) at an altitude of . 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. The XF-108 interceptor was cancelled outright, and the B-70 project was re-oriented to a research project only.

Variants

;J93-GE-1: thrust with afterburner. ;J93-GE-3: Production variant produced in small numbers for the

program. ;J93-GE-3R: Variant with thrust reverser, thrust with afterburner. ;J93-GE-3AR: Variant intended for the

Applications

* Convair NB-58A Hustler (testbed) *

(intended)

Specifications (J93-GE-3)

References

External links