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Engine, Resojet


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:

The "resojet," made by Reaction Motors, Incorporated (RMI) in 1944 to attempt to duplicate the pulsejet engine of the German V-1 cruise missile, was not a rocket, but an air-breathing, reaction-propulsion motor. The project began in July 1944 when RMI engineers were summoned by the Navy Bureau of Aeronautics in Washington, D.C. for consultations on the V-1. The Navy was primarily interested in a potential motor for its own ship-borne missile. The RMI engineers were provided with very sketchy details and were asked to construct and test a duplicate. Work on this development started in mid-July and was completed in early August. Tests were undertaken until September. RMI succeeded in improving the device, but the U.S. armed forces chose to copy the V-1 pulsejet along with the missile, so the resojet was abandoned.

Thiokol Chemical Corporation, which acquired RMI in 1958, gave this motor to the Smithsonian in 1975.

Collection Item Long Description:

Data Source

National Air and Space Museum


Do not reproduce without permission from the Smithsonian Institution, National Air and Space Museum


Reaction Motors, Inc.

Credit Line

Gift of Thiokol Chemical Corporation


  • Aluminum Alloy
  • Steel
  • Paint
  • Solder
  • Enamel
  • Copper Alloy


  • Overall: 10in. x 11in. x 10ft 4 1/2in. x 6in. (25.4 x 27.94 x 316.23 x 15.24cm)
  • Storage (Rehoused on aluminum pallet): 154.9 × 322.6 × 172.1cm, 319.8kg (61 in. × 10 ft. 7 in. × 67 3/4 in., 705lb.)

See more items in

National Air and Space Museum Collection

Country of Origin

United States of America



Inventory Number


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