UK company Reaction Engines has successfully conducted the first phase of tests of its precooler heat exchanger for the Synergetic Air - Breathing Rocket Engine ( Sabre ) hydrogen - fueled engine . : your questions answered Reaction said in the ground - based tests , undertaken at its UK TF2 facility , the precooler cooling system , known as HTX , operated successfully with a 420C intake temperature – at Mach 3 temperatures – in 0.05 of a second . Subsequent HTX trials will increase the temperature to more than 1,000C , equivalent to Mach 3 thermal conditions .
UK company Reaction Engines has successfully conducted the first phase of tests of its precooler heat exchanger for the Synergetic Air - Breathing Rocket Engine ( Sabre ) hydrogen - fueled engine . Reaction said in the ground - based tests , undertaken at its UK TF2 facility , the precooler cooling system , known as HTX , operated successfully with a 420C intake temperature – at Mach 3 temperatures – in 0.05 of a second . Subsequent HTX trials will increase the temperature to more than 1,000C , equivalent to Mach 3 thermal conditions .