Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. 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More - https://iiif.si.edu View Manifest View in Mirador Viewer Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. 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This is a replica of the regeneratively-cooled liquid fuel rocket motor designed and built by James H. Wyld of the American Rocket Society (ARS) in 1937.

One major problem faced by early rocket experimenters was overheating of their small motors. Wyld's solution was regenerative-cooling, which was also tried by Robert Goddard and by rocket experimenters in Europe. In this system, the propellant circulates around the motor in a cooling jacket before injection into the combustion chamber where it is ignited with the oxidizer (liquid oxygen). The pre-heated fuel also aids its combustion. The motor was successfully tested in 1938 and 1941.

Wyld and three other ARS members formed Reaction Motors, Inc. (RMI), in December 1941 and this motor is an early replication by the company of that first model, with some of the materials changed. The Reaction Motors Division of Thiokol Chemical Corp. sent the motor to the Smithsonian in 1952.

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Date ca. 1937 Country of Origin United States of America Type PROPULSION-Rocket Engines Manufacturer Reaction Motors, Inc.
 Dimensions 3-D: 20.3 x 12.7 x 8.9cm (8 x 5 x 3 1/2 in.)
 Materials Rods, Chrome-plated steel; cooling jacket, nickel-plated brass; nuts, steel; motor, proper (threaded interior cylinder), non-ferrous metal; retainer rings, steel; hex nut on component No. 3, aluminum; B-nut, brass; nozzle, non-ferrous metal, possibly plated copper or brass; nozzle sleeves or collars (two), brass
 Inventory Number A19520057000 Credit Line Gift of Thiokol Chemical Corporation, Reaction Motors Division Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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