A military engine program aimed at Mach 4-plus applications could have major fuel-saving potential for future commercial airliners. The U.S. Defense Advanced Research Projects Agency’s Vulcan program is focused on integrating a new propulsion concept called a constant volume combustion (CVC) engine with a turbojet to power a full-scale vehicle from rest to beyond Mach 4. Although aimed at possible long-range strike and reconnaissance aircraft, as well as missiles, Darpa says the same ...

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