A high-temperature airflow test site designed to evaluate a key technology in the Reaction Engines’ hypersonic air-breathing combined cycle Sabre rocket engine is under assembly at Front Range Airport near Watkins, Colorado. Construction of the facility follows the award earlier this year of a U.S. Defense Advanced Research Projects Agency (DARPA) contract to test the engine’s pre-cooler heat exchanger, or HTX. The test work, which is due to start in 2018, will focus on running ...

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