According to Reaction Engines, they have successfully tested the key pre-cooler component in its SABRE engine which is crucial for the development of the SKYLON spaceplane. The company claims that it can develop both rocket or jet-based crafts that can use the SABRE engine to reach any place on Earth in under four hours time, or even travel directly into space. The speed that the SABRE allows is about five times the speed of sound within Earth's atmosphere, or twenty-five times the speed of sound flying directly in orbit. The pre-cooler allows the engine to be chilled from 1832-degrees Fahrenheit to -238-degrees in under a tenth of a second. Without this pre-cooler, the engine would obviously overheat and it would be impossible to achieve such impressive speeds.

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