Allison (General Electric) J33-A-23 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 1943, the Army asked GE to propose a 13,344 to 17,792 N (3,000 to 4,000 lb) thrust turbojet engine. GE's response was the I-40 (J33), a centrifugal-flow engine that could be produced in a short time, as well as the axial-flow TG-180 (J35), which required a longer development time. First off the block, the I-40 went into service in 1945 in America's first operational jet fighter, the Lockheed P-80A.

To meet wartime needs, production was licensed to the Allison Division of General Motors. When World War II ended, the Army Air Forces re-evaluated its production program, and turned over all post-war production of the J33 to Allison.

The J33 was GE's first turbojet engine of its own design, the last all-centrifugal-flow engine built by GE, and last used in U.S. military combat aircraft. The J33 powered many first generation U.S. military jet aircraft. This engine powered the Lockheed F-80C and TF-80C.

Collection Item Long Description:

Data Source

National Air and Space Museum


General Electric Aircraft Engines

Credit Line

Transferred from the U.S. Air Force Museum, Wright-Patterson AFB, Ohio


Length 272 cm (107.0 in.), Diameter 128 cm (50.5 in.)

Country of Origin

United States of America


Circa 1948

Physical Description

  • Type: Turbojet
  • Thrust: 17,347 N (3,900 lb)
  • Compressor: Single-stage centrifugal
  • Combustor: 14 chambers
  • Turbine: Single-stage axial
  • Weight: 780 kg (1,720 lb)


PROPULSION-Turbines (Jet)

Inventory Number


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