Douglas X-3 Stiletto

The X-3 Stiletto was a 1950's experimental aircraft. It was designed to investigate the features of an aircraft that could sustain supersonic speeds. It was however seriously underpowered for its purpose, and could not even exceed Mach 1 in level flight. Though the aircraft was a disappointment, Lockheed designers used data from the X-3 tests for the F-104 Starfighter which used a similar wing design in a successful Mach 2 fighter.



http://en.wikipedia.org/wiki/X-3_Stiletto