Bell X-1B

From the placard:
The X-1B was one of a series of rocket-powered experimental research airplanes designed for investigation of various problems associated with supersonic flight. Specifically, the mission of the X-1B was flight research pertaining to aerodynamic heating and pilot reaction control systems. It made its first powered flight on October 8, 1954
On all test missions, the X-1B was carried to launching altitude, normally 25,000 to 35,000 feet, nestled under a "mother" airplane. It was then released in mid-air and rocket power was applied which, under full throttle, lasted less than five minutes. After all fuel (an alcohol-water mixture) and liquid oxygen had been consumed, the pilot glided the airplane to earth for landing.
The airplane on display was transferred to the Air Force Museum in January 1959.

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