Visually one of the most striking aircraft ever, the Douglas X-3's advanced airframe design was unfortunately underpowered. Contemporary engine technology could not match the airframe's potential.

In its fastest flight on July 28, 1953 the X-3 was clocked at Mach 1.21 in a dive. This was far below what Douglas and the Air Force had anticipated. Only one X-3 flew, providing little data for researchers into high-speed flight. It did provide Douglas experience in the use of titanium and other exotic materials and production techniques.

One interesting fact, the X-3 had one of the fastest take-off speeds in history - 260 m.p.h.! Lockheed's 'Kelly' Johnson used data relating to the low aspect ratio wings of the X-3 when finalizing his F-104 Starfighter design.

Shown in this painting, the X-3 is as it appeared while test flying for NACA (National Advisory Committee for Aeronautics), before retiring in 1956.

The X-3 currently resides at the Air Force Museum in Dayton, Ohio.