Freshly infused with government and industry funding, and riding a wave of interest in Europe and the U.S., Reaction Engines Ltd. is firming up plans to build a fighter engine-size ground demonstrator of its reusable hypersonic propulsion system. As that rarest of beasts, a powerplant concept combining the air-breathing efficiency of a jet engine with the power and vacuum operating capability of a rocket, the SABRE (Synergistic Air-Breathing Rocket Engine) cycle is a potential game changer ...

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