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The XLR-11 rocket engine, developed by Reaction Motors, Inc. (RMI), was initially used in the Bell X-1 rocket research aircraft, the first plane to reach the speed of sound, in 1947. Each of the four chambers produced 1,500 pounds of thrust. They were fired separately or in groups for a maximum thrust of 6,000 pounds.

Besides the X-1, the engine was used in the X-1A, X-1B, X1D, X-1E, Douglas D-558-2 Skyrocket, and XF-91. Two XLR-11s also served as the "Interim Engine" for the X-15 research aircraft, while its larger XLR-99 engine was completing its development. This XLR-11 is one of two used in the first test flight of the X-15 on 17 September 1959. The engine was transferred to the NASM in 1963 by the U.S. Air Force.

 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
Country of Origin United States of America Type PROPULSION-Rocket Engines Manufacturer Reaction Motors, Inc.
 Dimensions Approximate: 5 ft. × 1 ft. 7 in., 210lb., 58.4cm (152.4 × 48.3cm, 95.3kg, 1 ft. 11 in.)
Other (Each of 4 Thrust Chambers): 1 ft. 9 3/4 in. × 6 in. (55.2 × 15.2cm)
 Materials HAZMAT: Cadmium
Anodized Aluminum
Ferrous Alloy
Non-Magnetic White Metal
Plastic
Paper
Ink
Paint
Adhesive Tape
 Inventory Number A19630362000 Credit Line Transferred from the U.S. Air Force Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
For more information, visit the Smithsonians Terms of Use.