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.
Data from: Aircraft engines of the World 1953
- Powered the McDonnell F3H Demon
- 9,700 lbf (43.15 kN) thrust (14,000 lbf (62.28 kN) thrust with afterburner), for the McDonnell F3H-2 Demon.
- 7,000 lbf (31.14 kN) thrust (9,500 lbf (42.26 kN) thrust with afterburner)
- Afterburning turbojet engines for the Martin XP6M-1 Seamaster flying boat prototypes.
- Afterburning turbojet engines for the Martin YP6M-1 Seamaster pre-production flying boats.
- 14,000 lbf (62.28 kN) thrust with afterburner
- Powered the Douglas RB-66 Destroyer
- 10,200 lbf (45.37 kN) thrust
Specifications (Allison J71-A-2)
Data from Aircraft engines of the World 1957
- Type: afterburning turbojet
- Length: 284.5 in (7,230 mm)
- Diameter: 39.5 in (1,000 mm)
- Frontal area: 8.5 sq ft (0.79 m2)
- Dry weight: 4,890 lb (2,220 kg)
- Compressor: 16-stage axial compressor
- Combustors: cannular with 10 flame tubes
- Turbine: 3-stage axial
- Fuel type: JP-4 / aviation kerosene
- Oil system: pressure spray with scavenge at 10–60 psi (69–414 kPa)