It was 'an exclamation point to the most successful hypersonic airbreathing flight test program in U.S. history.'
DARPA hasn't released certain information, such as how much of the test was carried out traveling over speeds of Mach 5 using the scramjet system. The press statement did, however, state that the "latest flight demonstrated improved capabilities and performance."The term hypersonic airbreathing refers to the design of scramjet engines, which take in air to mix oxygen from the atmosphere with hydrogen fuel.
Scramjet engines collect this oxygen as the aircraft or missile travels. The oxygen is then mixed with hydrogen fuel, which creates the combustion needed for hypersonic flight — Mach 5, or five times faster than the speed of sound.feature an inlet that forces in air and compress it before it's mixed with hydrogen fuel. The hydrogen fuel ignites and is directed out of the nozzle at the back of the engine.
Though the U.S. Air Force will no longer test HAWC, DARPA plans to continue developing the technology used for the program with its More Opportunities with HAWC program. "Those missiles will expand the operating envelope of the scramjet and provide technology on-ramps for future programs of record," DARPA explained in its statement.
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