It is a well-established truism in aerospace that leaps in propulsion technology almost always precede major advances in spacecraft or aircraft design. As the clamor for affordable access to space continues to grow, there is mounting interest in the Synergetic Air-Breathing Rocket Engine (Sabre) concept under development by U.K.-based Reaction Engines. This hybrid powerplant is designed to bridge the infamous power gap between air breathers and rockets, potentially enabling a vehicle to ...

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