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The fastest rocket ever built is up for auction

An historic HFL Kholod Mach 6.47 scramjet jointly developed by NASA and CIAM -- the fastest rocket ever built -- is going under the hammer in September.

By July 21, 2014


X-51A Waverider hits Mach 5.1 in final flight

The accomplishment marks the longest flight for the $300 million X-51A technology demonstration program and, according to the Air Force and Boeing, the longest scramjet-powered hypersonic flight ever.

By May 3, 2013


Futuristic X-51A fails in hypersonic bid

Trouble with a control fin on the sleek, scramjet-powered aircraft puts an abrupt and early end to the Air Force's attempt at a Mach 6 flight.

By August 15, 2012


X-51A races to hypersonic record

The Air Force's experimental, scramjet-powered Waverider makes a short but historic flight in a test range over the Pacific Ocean.

By May 26, 2010


New brief on DARPA's Vulcan engine

Vulcan combines turbine and scramjet engines to power hypersonic vehicle.

By June 24, 2008


Photos: NASA's X-43A "scramjet"

A peek at the rocket plane that broke the airspeed record.

November 16, 2004


Photo: NASA's X-43A scramjet

Monday's flight of the X-43A is to test a type of supersonic engine that uses forward motion for power.

November 15, 2004


Rocket plane breaks airspeed record

NASA successfully tests Mach 10 rocket-powered "scramjet" after a day's delay. Photos: NASA's X-43A "scramjet"

By November 16, 2004


NASA tries to set airspeed record

Space agency wants to see if pilotless aircraft has right stuff to travel at 10 times the speed of sound. Photo: NASA's X-43A scramjet

By November 15, 2004