ATK test hypersonic engine

British "Flight International" reported on April 17, 2007 that AliantTechsystems (ATK) has validated a simplified hypersonic engine that has made it possible to develop a high-speed attack weapon in the near future. The test consisted of ground running an active weight fueled engine with a flying weight at Mach 5.



After launching in the air or on the ground, the proposed missile is accelerated from rocket to hypersonic, when the hot throat ramjet engine (TTRJ) ignites to maintain the Mach 5 cruise, allowing the weapon to fly 650km in 8min.



According to Charlie Precourt, vice president of ATK's launch system, the design of a single Mach number avoids the complexity of the adjustable inlet, while the choice of Mach 5 eliminates the need for rare materials, supersonic combustion and complex cooling and control systems. ATK's ALRJ-M5 engine uses off-the-shelf metal materials and manufacturing processes as well as conventional JP10 hydrocarbon fuel.



ATK said that the ALRJ-M5 engine is ready for flight testing. The engine is aimed at the engine used by Boeing for the Boeing X-51 scramjet engine and the US-Australia HiFire hypersonic flight study. The planned replacement of the engine in the near future. Both programs are led by the Air Force Research Laboratory.



ATK is building an engine designed for the X-51. It will be smaller than the Pratt & Whitney engine, so it can make room for a recycling parachute so that the riding aircraft can be recycled.

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