Allison J71

J71
J71 engine change in progress on a F3H-2 Demon, 1963.
Type	Turbojet
Manufacturer	Allison Engine Company
First run	1948
Major applications	B-66 Destroyer F3H Demon
Developed from	Allison J35

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

Operational history

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.

Variants

J71-A-2

Powers 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.

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

Specifications (Allison J71-A-2B)

Data from Gunston.

General characteristics

• Type: Afterburning turbojet
• Length:
• Diameter:
• Dry weight:

Components

• Compressor: 16-stage axial compressor
• Combustors: Cannular, 10 chambers
• Turbine: 3-stage

Performance

• Maximum power output:
• Overall pressure ratio: 8:1
• Air mass flow: 160 lb/sec
• Power-to-weight ratio:

See also

Related development

• Allison J35

Related lists

• List of aircraft engines

References

Notes

Bibliography

• Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9

External links

• Allison J71 Turbojet
• "J71 - Allison's Big Axial Turbojet" a 1955 Flight article
• J71 page on LeteckeMotory.cz (cs)