This may be old news but I'm going to post anyway.Did a quick search looks like no one posted this info yet
Pratt & Whitney Rocketdyne Successfully Tests Dual-Mode Ramjet Engine at Mach 4 Flight Conditions
WEST PALM BEACH, Fla. - May 5, 2009
Pratt & Whitney Rocketdyne's PWR-9221FJ dual-mode ramjet engine successfully completed its first ground test at Mach 4 flight conditions at Arnold
Engineering Development Center, Tullahoma, Tenn. A dual-mode ramjet engine is a key technology for developing reusable hypersonic vehicles. Pratt &
Whitney Rocketdyne is a United Technologies Corp. (NYSE:UTX) company.
"Successful demonstration of the dual-mode ramjet engine integrated with a variable geometry inlet and exhaust nozzle sets the stage for future
turbine-based, combined-cycle propulsion and flight demonstration opportunities," said Cal DeFreese, program manager, Falcon Combined-Cycle Engine
Technology (FaCET), Pratt & Whitney Rocketdyne. "Current testing is focused on validating the operability and robustness of the dual-mode ramjet
design during simulated transitions from turbojet to ramjet propulsion modes."
A dual-mode ramjet engine is designed to operate as both a ramjet at moderate supersonic speeds (up to Mach 5) and a scramjet at hypersonic speeds
(greater than Mach 5). This broad range of operational capability is required for turbine-based, combined-cycle propulsion that would enable a vehicle
to take off from and land on a conventional runway, and travel at speeds up to Mach 6.
The tests are being conducted as part of the Defense Advanced Research Projects Agency's FaCET program; Pratt & Whitney Rocketdyne is a principal
contractor to Lockheed Martin on the program. Additional tests over the next two months are designed to check the integrated system performance from
Mach 3 to Mach 6 flight conditions.
www.deagel.com...
[edit on 10-2-2010 by flyingfish]



