Reaction, which was founded in 1989, is building “Sabre”, short for Synergetic Air Breathing Rocket Engine, a new design that combines a conventional jet with a rocket. Sabre can work like a ...

The Sabre air-breathing rocket engine is designed to drive space planes to orbit and take airliners around the world in just a few hours. To work, it needs to manage very high temperature airflows ...

The Sabre engine is part jet, part rocket, and relies on a novel pre-cooler heat-exchanger technology. This pre-cooler system will begin a new phase of testing in the next month or so in Colorado ...

Another "exotic design" reported by The Register is the SABRE (Synergetic Air Breathing Rocket Engine) which combines the ...