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-2
Powered the McDonnell F3H Demon
J71-A-2B
J71-A-2E
9,700 lbf (43.15 kN) thrust (14,000 lbf (62.28 kN) thrust with afterburner), for the McDonnell F3H-2 Demon.
YJ71-A-3
7,000 lbf (31.14 kN) thrust (9,500 lbf (42.26 kN) thrust with afterburner)
J71-A-4
Afterburning turbojet engines for the Martin XP6M-1 Seamaster flying boat prototypes.
J71-A-6
Afterburning turbojet engines for the Martin YP6M-1 Seamaster pre-production flying boats.
J71-A-9
Powered the Douglas RB-66 Destroyer
J71-A-11
10,200 lbf (45.37 kN) thrust
Data from
Type: Afterburning turbojet
Length: 284.6in including reheat
Diameter:
Dry weight: 4869lb (2209kg) with reheat
Compressor: 16-stage axial compressor
Combustors: Cannular, 10 chambers
Turbine: 3-stage
Maximum thrust: 14000lbf (62.28kN) reheated
Overall pressure ratio: 8.75:1
Air mass flow: 160 lb/s (72.57kg/s)
Power-to-weight ratio:
