The Allison J71 was a single spool turbojet engine, designed and built in the United States. It began development in 1948 as a much modified J35, originally designated 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-2Powered the
McDonnell F3H DemonJ71-A-2BJ71-A-2E9,700 lbf (43.15 kN)
thrust (14,000 lbf (62.28 kN) thrust with afterburner), for the McDonnell F3H-2 Demon.
YJ71-A-37,000 lbf (31.14 kN) thrust (9,500 lbf (42.26 kN) thrust with afterburner)
J71-A-4Afterburning turbojet engines for the Martin XP6M-1 Seamaster flying boat prototypes.
J71-A-6Afterburning turbojet engines for the Martin YP6M-1 Seamaster pre-production flying boats.
J71-A-9Powered the Douglas RB-66 Destroyer
J71-A-1110,200 lbf (45.37 kN) thrust
Data from
Type: Afterburning turbojetLength: 284.6in including reheatDiameter:Dry weight: 4869lb (2209kg) with reheatCompressor: 16-stage axial compressorCombustors: Cannular, 10 chambersTurbine: 3-stageMaximum thrust: 14000lbf (62.28kN) reheatedOverall pressure ratio: 8.75:1Air mass flow: 160 lb/s (72.57kg/s)Power-to-weight ratio:
