X51A "WaveRider" Test Flight Set
Only Hypersonic Test Flight Planned For This Fiscal Year
The X-51A WaveRider will make its first hypersonic flight test attempt from Edwards Air Force Base on Tuesday, May 25. The unmanned aerial vehicle will be released from a B-52 bomber off the southern California coast.
The X-51A is expected to fly autonomously for five minutes -- powered by a supersonic combustion ramjet (scramjet) motor -- accelerate to about Mach 6 and transmit large amounts of data to ground stations before it splashes down into the Pacific and breaks up, as planned. There are no plans to recover the flight test vehicle, one of four built.
"In those 300 seconds, we hope to learn more about hypersonic flight with a practical scramjet engine than all previous flight tests combined," said Charlie Brink, X-51A program manager with the Air Force Research Laboratory's Propulsion Directorate at Wright-Patterson Air Force Base. The longest previous hypersonic scramjet flight test, performed by a NASA X-43 in 2004, was faster, but lasted only about 10 seconds and used less logistically supportable hydrogen fuel.
The X-51A program is a collaborative effort of the Air Force Research Laboratory and the Defense Advanced Research Projects Agency, with industry partners The Boeing Company and Pratt & Whitney Rocketdyne.
The May 25 attempt will be the only hypersonic flight attempt this fiscal year, a change from the original test plan, which was to fly once in December 2009 and three more times in 2010. A combination of factors, including high demand for flight-test and range assets such as the B-52, contributed to the pause.
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