Allison J71

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The Allison J71 is a jet engine made by the US manufacturer Allison .

Allison J71-A-2 of a McDonnell F3H

The engine was developed as a further development from the Allison J35 and was originally to be given the designation J35-A-23. The main change concerned the type and shape of the combustion chamber . While the J35 still had ten separate combustion chambers, the J71 had injection and combustion in a large, ring-shaped combustion chamber. Allison referred to this design as "cannular".

The compression took place in a 16-stage axial compressor, driven by an also axial three-stage turbine. The engine was suitable for all weather conditions and had its own de-icing system in the inlet, which was heated with bleed air. Hydraulics supplied the adjusting elements in the inlet and on the outlet nozzle. The engine control was electro-hydraulic with a control unit developed and built by Honeywell .

During the approval test, the engine produced a take-off thrust of 44.5 kN at 6100 min-1.

J71-A-2

First production version for the McDonnell F3H . Equipped with an afterburner , it delivered a static thrust of 62.2 kN.

J71-A-3

Version for the Northrop SM-62 Snark as a loss engine. This version was originally intended for a further development of the Northrop F-89 , the F-89E. This engine delivered a thrust of 43.2 kN.

J71-A-4

Version for the Martin P6M with an afterburner that is shorter than the version A-2. The maximum thrust with afterburner was 57.9 kN.

YJ71-A-5

Version for the non-produced Boeing B-47C with 47.7 kN thrust.

J71-A-7

Improved version of the J71-A-2, should be used in the Republic F-105 .

J71-A-9

Version for the Douglas B-66A without afterburner. The decision to manufacture this version was made on August 5, 1952.

J71-A-11

Improved version for the Douglas RB-66B, also without an afterburner.

J71-A-13

For the variants Douglas B-66B, EB-66C / E, RB-66B / C, WB-66D

Technical data (J71-A-2)

  • Compressor: axial, 16-stage
  • Turbine: axial, three-stage
  • Compression: 8: 1
  • Air flow: 72.57 kg / s
  • Length: 7230 mm (with afterburner)
  • Diameter: 1067 mm
  • Weight: 2208 kg
  • Starting thrust: 62.2 kN

Technical data (J71-A-11)

  • Compressor: like A-2
  • Turbine: like A-2
  • Length: 4850 mm
  • Diameter: 1209 mm
  • Weight: 1855 kg
  • Starting thrust: 45.4 kN

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  • Janes all the world aircraft 1956/57