Northrop-Hendy Turbodyne I Turboprop 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 1939, Northrop Aircraft undertook company-funded preliminary design of a turboprop engine. A joint Army-Navy contract was awarded in 1941 for detailed design and analysis of a 2,500 shp (1,864 kW) engine and fabrication of a compressor for it. A contract amendment later added construction of two complete 3,800 shp (2,834 kW) engines.

Having little time or space for fabricating parts, Northrop joined with the Joshua Hendy Iron Works in 1944 to form the Northrop-Hendy Company. The engine did not reach its design performance due largely to low compressor and turbine efficiencies, and a compressor failure destroyed the first engine and terminated testing. Following the 1945 cancellation of the Navy contract, the Army continued with the testing of this second engine until it also partially failed. Development was then discontinued.

Although potential high efficiency encouraged Northrop to continue turboprop engine development, possibly as a backup for the Boeing XB-52 bomber, the later XT37 endeavor was similarly unsuccessful.

Collection Item Long Description:

Data Source

National Air and Space Museum


Credit Line

Transferred from the U.S. Navy, Naval Air Station, Norfolk, Virginia


Steel, Aluminum, Brass, Ceramic, Magnesium, Copper, Inconel, Paint


Depth 160 cm (63 in.), Width 104 cm (41 in.), Length 236 cm (93 in.)

Country of Origin

United States of America


Circa 1945

Physical Description

  • Type: Turboprop
  • Power Rating: 1,790 kW (2,400 bhp) at 10,000 rpm
  • Compressor: 18-stage axial
  • Combustor: Unknown
  • Turbine: 4-stage axial


PROPULSION-Turbines (Jet)

Inventory Number