Reaction Engines has achieved a major breakthrough in the U.S. market with a contract from the U.S. Defense Advanced Research Projects Agency (DARPA). The award covers conducting high-temperature testing of the precooler technology at the heart of its proposed hypersonic air-breathing, combined-cycle Sabre rocket concept. Reaction has seen interest grow in the U.S. about elements of Sabre, particularly the precooling heat exchanger, ever since the concept was first independently validated ...

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