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Boeing, Rolls-Royce Back Reaction Hypersonic Engine Developer // AviationWeek.com Commercial Aviation Channel
http://aviationweek.com/awindefense/boeing-rolls-royce-back-reaction-hypersonic-engine-developer-0
The emergence of Boeing and Rolls-Royce as new backers represents a significant endorsement for Reaction, which is designing and testing an air-breathing, combined-cycle rocket engine concept dubbed Sabre.
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