The XLR-11 rocket engine, originally designated 6000C-4 by its manufacturer, Reaction Motors, Inc. (RMI), is of the same kind used in the Bell X-1, the first plane to achieve the speed of sound on October 14, 1947. Each of the chambers could be fired separately, delivering 1,500 pounds of thrust per chamber. This particular XLR-11 is one of two which powered the first test flights of the X-15.

The engine was developed from 1945 and, with minor modifications, was used on a variety of rocket research aircraft besides the X-1. Two of the 4-barrel motors, or engine, served as the "Interim Engine" for the X-15 while its XLR-99 engine was under development. The engine also powered several NASA aerodynamic test craft called Lifting Bodies. The 6000C-4 saw an active service life from 1945-1975, when it was last used in the X-24B.

Transferred to NASM from the U.S. Air Force in 1963.

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

Overall: 19 in. wide x 60 in. long (48.26 x 152.4cm)
Other: 21 3/4 in. long x 6 in. diameter (55.25 x 15.24cm)

Materials

Overall, stainless steel

Inventory Number

A19630363000

Credit Line

Transferred by the U.S. Air Force

Data Source

National Air and Space Museum

Restrictions & Rights

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