General Electric (Allison) J33 Turbojet Engine


Display Status:

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.

Collection Item Summary:

In response to an Army request in 1943 for a 3,000 - 4,000 lb (13,344 - 17,792 N ) thrust turbojet, GE proposed the I-40, a centrifugal-flow engine that could be produced in a short time. Service as the J33 began in 1945 on the Lockheed P-80A, America's first operational jet fighter, and its primary application.

For wartime needs, production was licensed to the Allison division of General Motors. When the war ended, the Army re-evaluated its engine program, and turned over all production to Allison.

The J33 was GE's first turbojet engine of its own design, its last all-centrifugal-flow engine; as well as the last to be used in U.S. military combat aircraft. It powered other first generation jet aircraft including: Martin XB-51; Lockheed XP-81, F-80A/B/C, RF-80A, QF-80F, XF-14/A, TF-80C, T-33A/B, AT-33A, DT-33A/B/C, RT-33A, QT-33A, WT-33A, T-1A; North American F-86C; Northrop F-89J; and Bell XP-83.

Collection Item Long Description:

Data Source

National Air and Space Museum

Credit Line

Transferred from the NASA Lewis Research Center, Cleveland, Ohio


  • Non Magnetic Metal
  • Aluminum
  • Paint
  • Plastic
  • Rubber
  • Fabric
  • Cadmium Plating
  • Compressed Fiber
  • Copper Alloy


Storage: 177.8 x 127 x 134.6cm (70 x 50 x 53 in.)

Country of Origin

United States of America


Circa 1944

Physical Description

  • Type: Turbojet
  • Thrust: 17,013 N (3,825 lb) at 11,500 rpm
  • Compressor: Single-stage centrifugal
  • Combustor: 14 interconnected straight-through chambers
  • Turbine: Single-stage axial
  • Weight: 851 kg (1,875 lb)


PROPULSION-Turbines (Jet)

Inventory Number


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