U.S. and Australian researchers say a rocket-boosted, hydrocarbon-fueled scramjet successfully operated for around 12 sec. while accelerating to Mach 8 from Mach 6.5 during a May 1 test from the Pacific Missile Range Facility in Hawaii. The flight was the fourth of 10 planned under the Hypersonic International Flight Research Experiment (HIFire) program, started in 2006 to develop technology for long duration scramjet flight at Mach 8. Given that the vehicle reportedly reached an altitude of ...


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