China’s success in flying a scramjet-powered hypersonic aircraft, trailing the U.S. by no more than a few years, reveals that its engineers have overcome severe cooling problems first mentioned five years ago. The successful test, announced in October, followed the January 2014 flight of a Chinese hypersonic glider. The China Society of Aeronautics and Astronautics says the engine of the aircraft, which must have been unmanned and probably quite small, is the world’s first ...


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