The Bell X-1, originally designated XS-1, was a joint NACA-U.S. Army Air Forces/US Air Force supersonic research project and the first aircraft to exceed the speed of sound in controlled, level flight. It was the first of the so-called X-plane, an American series of experimental aircraft designated for testing of new technologies and usually kept highly secret. Design and development XS-1 in front of the X-1, which he named Glamorous Glennis after his wife.]]On 16 March 1945 the United States Army Air Forces' Flight Test Division and the National Advisory Committee for Aeronautics (NACA) (now NASA) contracted Bell Aircraft to build three XS-1 (for "Experimental, Supersonic", later X-1) aircraft to obtain flight data on conditions in the transonic speed range.Miller 2001 The XS-1 was the first high-speed aircraft built purely for aviation research purposes and was never i

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