For over 70 years, the X-planes have represented the cutting edge of American aerospace innovation, experimental aircraft ...

Meet the X-1: When it comes to testing airplanes the “X” designation means experimental. The first X aircraft was built in 1945 by Bell in partnership with the U.S. Army ...

Three X-1 aircraft were built. The first flew unpowered in 1946, with powered flights starting the same year. The X-1A and X-1B were follow-on variants featuring design enhancements that allowed ...

If you've been keeping tabs on aviation news as of late, you saw that Boom Supersonic just recently broke the sound barrier with its XB-1 demonstrator aircraft. Oddly enough, no one on the ground ...

The X-plane demonstrator builds on Bell’s experience with tiltrotor aircraft, but with a new stop/fold rotor feature that ...

Boom Supersonic has gone, well, supersonic, its XB-1 prototype breaking the sound barrier today in the skies over the Mojave Air & Space Port in California. With Chief Test Pilot Tristan ...

NASA flew the autonomous X-43 test vehicle to hypersonic speed two times in 2004, and the Air Force demonstrated an air-breathing scramjet engine at Mach 5.1 with the X-51 Waverider aircraft in 2013.

Even today, nearly sixty years after the X-15 was last flown in 1968, the aircraft still holds speed and altitude records. The X-15’s top speed: Mach 6.7, or 4,520 miles per hour.

A visitor looks at an exhibit of the Bell X-1 aircraft in the Air and Space Building when it was still located in the temporary metal building in the South Yard. Contained within Smithsonian ...