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The technology slows incoming fresh air to less than sound speed before it enters the combustion chamber, allowing the fuel to burn more thoroughly. The prototype engine was put to the test in a ground simulation of a flight at an altitude of 25 kilometers (15.5 miles) at Mach 6 speed (six times the speed of sound), and it produced fuel efficiency of 79 percent, which is nearly twice as high as a conventional scramjet engine under the same circumstances. Boron-powered scramjet engine The primary fuel component for the prototype engine is boron powder, according to the researchers. Grey in...
