U.S. military hypersonic aircraft trial set for 2013

The last of four unmanned experimental U.S. military aircraft designed to fly at six times the speed of sound is expected to be tested next year, the program manager said on Wednesday, months after its predecessor broke up during a trial. The third test flight of the craft, known as the Waverider or X-51A, broke apart over the Pacific Ocean seconds into a test flight in August. U.S. Air Force officials said at the time they did not know if or when their fourth aircraft would fly.

See the full article at Reuters