Reaction Engines has tested the aircraft at simulated speeds of Mach 3.3, or three times the speed of sound
They aim to fly at Mach 25 which they say would be able to travel from New York to London in under one hour
The company tested a new 'pre-cooler' technology which would enable it to travel at hypersonic speeds
Their experimental Synergetic Air Breathing Rocket Engine - Sabre - is designed to drive space planes to orbit

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