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 ...