The twin-turbojet X-3, the only one built, was designed to test sustained flight at twice the speed of sound. It also explored the use of very short wings and titanium airframe construction.

Engine development difficulties forced the use of lower-powered engines than originally planned, prohibiting the X-3 from achieving its Mach 2 design potential. Even so, data gained from the X-3 program greatly benefited the F-104, X-15, SR-71 and other high performance aircraft.

The X-3 had a ceiling of 38,000 feet and an airspeed of 700 MPH

The X-3 made its first test flight at Edwards Air Force Base, Calif., in October 1952. The X-3 was transferred to the museum in 1956.