Item: British company believes it has developed breakthrough technology that will allow the same engine to be operated efficiently in the atmosphere and outer space:
Reaction Engines Ltd believes its Sabre engine, which would operate like a jet engine in the atmosphere and a rocket in space, could displace rockets for space access and transform air travel by bringing any destination on Earth to no more than four hours away.
Article here. The actual technology is not fully discussed or disclosed, but I would think it has applications beyond its use in an engine.
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