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General Electric T31, Presidential Gallery, National Museum USAF.jpg
A T31 in the Presidential Gallery of the National Museum of the United States Air Force

The General Electric T31 (company designation TG-100) was the first turboprop engine designed and built in the United States.

Design and developmentEdit

Curtiss XC-113

The XC-113, with T31 in the No. 2 position

The first American turboprop engine was the General Electric XT31, first used in the experimental Consolidated Vultee XP-81.[1] The XP-81 first flew in December 1945, the first aircraft to use a combination of turboprop and turbojet power.

The T31 engine was the first American turboprop engine to power an aircraft.[2] It made its initial flight in the Consolidated Vultee XP-81 on 21 December 1945. The T31 was mounted in the nose; a J33 turbojet engine mounted in the rear fuselage provided added thrust. The T31 was also used on the Navy XF2R-1, similarly powered by a turboprop/turbojet engine combination. The engine was to have been flown experimentally on a Curtiss XC-113 (a converted C-46), but the experiment was abandoned after the XC-113 was involved in a ground accident. Only 28 T31s were built; none were used in production aircraft, but improved production turboprop engines were developed from the technology pioneered by the T31.

A derivative of the T31, the General Electric TG-110, given the military designation T41, was ordered but subsequently cancelled.


Specification (XT31)Edit

General Electric T-31

A T31 at Presidential Gallery, National Museum of the United States Air Force

General characteristics
  • Type: Turboprop
  • Length:
  • Diameter:
  • Dry weight: 1,980 lb
  • Compressor:
  • Maximum power output: 2,300 shp (design) at 13,000 rpm. (1,145 propeller rpm)
  • Power-to-weight ratio:

See alsoEdit


  • Gunston, Bill (2006). World Encyclopedia of Aero Engines, 5th Edition. Phoenix Mill, Gloucestershire, England, UK: Sutton Publishing Limited. pp. 79. ISBN 0-7509-4479-X. 

External linksEdit

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