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Liner, Rocket Engine, JATO, M17G


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:

This is the liner for the 1,300 pound thrust M17G regeneratively-cooled liquid fuel rocket motor constructed and tested by Reaction Motors, Inc. Its development in 1942 contributed to the development of a JATO (Jet-Assisted-Take-Off) unit for use by heavily-loaded Navy PBM seaplanes.

The raised diagonal ridges helped channel the fuel (gasoline) around the chamber while fine grooves throughout the length of the jacket cylinder helped swirl the coolant. The liner thus served as a cooling jacket and gave the motor a double wall. But the Navy did not adopt liquid fuel JATO engines and chose simpler and cheaper solid propellant JATOs.

The Reaction Motors Division of Thiokol Chemical Corporation donated this engine to the Smithsonian in 1967.

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


Credit Line

Reaction Motors Div., Thiokol Chemical Corp.


  • Steel
  • Copper
  • Phosphate surface finish
  • Foam
  • Adhesive


14 7/8" x 6 15/16" Diameter

Country of Origin

United States of America


PROPULSION-Components (Engine Parts)

Inventory Number


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