An anonymous reader quotes a report from Interesting Engineering: The U.S. Air Force joins a group of venture capital firms in making a $60 million investment in Hermeus, a Georgia-based startup that is striving to make the world’s first reusable hypersonic aircraft, a press statement reveals. The new contract, awarded on July 30, sets ambitious objectives for Hermeus, to be accomplished over the next three years. These include the building of three prototypes of the company’s Quarterhorse aircraft and the testing of its full-scale reusable hypersonic propulsion system. If all goes to plan, the Quarterhorse passenger aircraft will be capable of flying at a staggering Mach 5 speeds, starting at 3836 mph (6174 km/h). By comparison, NASA’s new supersonic jet, the X-59, will fly at Mach 1.5 and reach top speeds of 990 mph.
As Hermeus’ aircraft will eventually be able to fly five times the speed of sound, it will be capable of traveling from New York to London in only 90 minutes — instead of seven hours it typically takes today’s commercial airliners. In order to reach those speeds, Hermeus is developing a proprietary turbine-based combined cycle (TBCC) engine, based on the GE J85 turbojet engine used for a variety of high-speed aircraft including Virgin Galactic’s White Knight carrier aircraft and Boom Supersonic’s prototype XB-1 aircraft. The first Quarterhorse prototype is set to be unmanned — much in the same way that Virgin Galactic’s first space plane missions were uncrewed, the earliest flight tests will not be piloted so as to eliminate the risk to human life and to allow the company to start its flight testing earlier. According to a 2020 report by Aviation International News, Hermeus has already built and tested a small-scale hypersonic engine prototype and it is now working on a full-scale engine demonstrator of its TBCC engine.
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