Allison J71

J71

J71 engine change in progress on a F3H-2 Demon, 1963.
Type	Turbojet
Manufacturer	Allison Engine Company
First run	1950
Major applications	B-66 Destroyer F3H Demon
Developed from	Allison J35

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.^[1]

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: 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.
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-2)

Data from ^[2]

General characteristics

Type: Afterburning turbojet
Length: 284.6in including reheat
Diameter:
Dry weight: 4869lb (2209kg) with reheat

Components

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

Performance

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:

References

Notes

↑ Gunston 1989, p. 11.
↑ https://www.flightglobal.com/pdfarchive/view/1957/1957%20-%201039.html?search=J71-A-2

Bibliography

Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
Kay, Anthony L. (2007). Turbojet History and Development 1930-1960 Volume 2:USSR, USA, Japan, France, Canada, Sweden, Switzerland, Italy and Hungary (1st ed.). Ramsbury: The Crowood Press. ISBN 978-1861269393.

External links

Wikimedia Commons has media related to Allison J71.

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

Allison Engine Company aircraft engines

V engines	VG-1410 V-1710 V-3420 X-4520

Turbojets	J33 J35 J71 J102

Turbofans	AE 3007 AR.168R† TF41

Turboprops/Turboshafts	250/T63 AE 2100 T38 T40 T54 T56 T406 T701

Propfan	578-DX†

† Joint development aeroengines

United States military gas turbine aircraft engine designation system

Turbojets	J30 J31 J32 J33 J34 J35 J36 J37 XJ38 J39 J40 XJ41 J42 J43 J44 J45 J46 J47 J48 XJ49 J51 J52 J53 J54 J55 J56 J57 J58 J59 J60 J61 J63 J65 J67 J69 J71 J73 J75 J79 J81 J83 J85 J87 J89 J91 YJ93 J95 J97 J99 J100 YJ101 J102 J400 J401 J402 J403 J700

Turboprops/ Turboshafts	T30 T31 T33 T34 T35 T36 T37 T38 T39 T40 T41 T42 T43 T44 T45 T46 T47 T48 T49 T50 T51 T52 T53 T54 T55 T56 T57 T58 T60 T61 T62 T63 T64 T65 T66 T67 T68 T69 T70 T71 T72 T73 T74 T76 T78 T80 T100 T101 T400 T405 T406 T407 T408 T700 T701 T702 T703 T706 T708 T800

Turbofans	TF30 TF31 TF32 TF33 TF34 TF35 TF37 TF39 TF41 F100 F101 F102 F103 F104 F105 F106 F107 F108 F109 F110 F112 F113 F117 F118 F119 YF120 F121 F122 F124 F125 F126 F127 F128 F129 F135 F136 F137 F138 F400 F401 F402 F404 F405 F408 F412 F414 F415

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