
On the flightline of Edwards Air Force Base, Calif., Staff Sgt. Jonathan Young prepares to upload the X-51A WaveRider hypersonic flight test vehicle to a B-52 Stratofortress July 17 for fit testing. Two B-52 test flights are planned this fall prior to the X-51's first hypersonic scramjet flight over the Pacific Ocean scheduled in December. Representatives from the Air Force Research Laboratory, DARPA, Pratt & Whitney Rocketdyne and Boeing are partnering on the X-51A technology demonstrator program.
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AIR FORCE PRESS RELEASE
Airmen successfully mated the X-51A WaveRider flight test vehicle to a B-52 Stratofortress July 17 at Edwards Air Force Base, Calif. The fit check followed integration earlier in the month of the Pratt & Whitney Rocketdyne scramjet propulsion system into the X-51 at Air Force Plant 42 in Palmdale, Calif.
The X-51 test vehicle is now back at the Boeing facility in Palmdale where additional systems integration and testing are taking place in preparation for its inaugural flight test in December, said Charlie Brink, X-51 program manager from the Air Force Research Laboratory’s Propulsion Directorate here.
During the flight test, currently planned Dec. 2, the Air Force Flight Test Center’s B-52 will carry the X-51A to 50,000 feet over the Pacific Ocean then release it. A solid rocket booster from an Army tactical missile system then will ignite and accelerate the X-51 to about Mach 4.5. Then, the supersonic combustion ramjet propulsion system will propel the vehicle for five minutes to more than Mach 6. Hypersonic combustion generates intense heat so routing of the engine’s own JP-7 fuel will help keep the engine at the desired operating temperature.
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