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|National origin||United States|
|Manufacturer||Fairchild Engine Division|
|Major applications||XSM-73 Goose|
|Developed from||Fairchild J44|
Design and development
In March 1953, the United States Air Force released General Operational Requirement (GOR) 16, which called air- and ground-launched decoy missiles to increase the effectiveness of Strategic Air Command bombers by confusing and saturating an air defense system. In December 1955, Fairchild was awarded a contract to develop the ground-launched decoy Weapon System 123A which included the XSM-73 Goose. McDonnell Aircraft was chosen in February 1956 to build the ADM-20 Quail air-launched decoy.
Two engine contracts were awarded in November 1954 to minimize development risk for both decoys. Each engine was in the 2,450 lbf (10.9 kN) thrust class with a thrust to weight ratio goal of 10:1. General Electric was awarded a contract for the development of the J85 and Fairchild was awarded a contract for a competing engine, the J83. Fairchild proposed a lightweight engine of conventional design. GE used a more advanced design which yielded a higher thrust to weight ratio.
Fairchild competed with two other engine manufacturers to provide the powerplant for the Canadair Tutor. A license-built J85 was chosen. The Northrop XQ-4A, was developed to use the J83 engine, but when the engine could not be developed in time the XQ-4A was canceled.
In November 1958, the J83 was canceled one month before the XSM-73. The USAF determined that the J85 had a higher probability of meeting the desired performance goals. The J85 could also be used to power the ADM-20 Quail decoy, the XSM-73 missile, and the T-38 Talon trainer. The J83 could only be used to power the XSM-73.
- Type: turbojet
- Dry weight: 363 lb (165 kg)
- Compressor: seven stage transonic axial flow compressor
- Combustors: annular combuster
- Turbine: two-stage turbine
- Fuel type: JP-4
- Maximum thrust: 2,450 lbf (10.9 kN)
- Specific fuel consumption: 0.94 lb/(lbf⋅h) or 27 g/(kN⋅s)
- Thrust-to-weight ratio: 6.5
- The History of North American Small Gas Turbine Aircraft Engines, William Fleming and Richard Leyes, AIAA, 1999