That solution might just be the new Vulcan engine, "a propulsion system that combines a Constant Volume Combustion (CVC) engine and a full-scale turbine engine to accelerate a hypersonic jet to multiple Mach." The goal is to create a craft that can deliver a payload up to 9,000 nautical miles from the US in less than two hours, which is pretty insane. Lets get this thing in commercial airliners, OK DARPA?
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