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Allison J71

J71 engine in a F3H-2 Demon

The Allison J71 was a turbojet engine, designed and built in the United States. It began development in 1948 as a modified J35 and was originally designated the J35-A-23.

The Allison J71 turbojet powered the Douglas B-66 Destroyer and the McDonnell F3H-2 Demon after the failed Westinghouse J40 proved unworkable. The prototype P6M SeaMasters were also fitted with the engine.


J71-A-2E: 9,700 lb (43.1 kN) thrust (14,000 lb (62.3 kN) thrust with afterburner)
J71-A-11: 10,200 lb (45.4 kN) thrust


Allison J71-A-2B

Type: Afterburning turbojet
Compressor: 16-stage axial compressor
Combustors: Cannular, 10 chambers
Turbine: 3-stage
Overall pressure ratio: 8:1



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