Atlanta startup Hermeus is developing the Chimera combined-cycle engine targeting Mach 5 commercial flight, which would cut New York-to-London transit time to roughly 90 minutes.
VectorHermeus is building a Mach 5 aircraft to cross the Atlantic in 90 minutes, and they've already put test hardware in the air.
VectorHermeus is building a Mach 5 reusable aircraft using combined-cycle propulsion, with military contracts funding the path to eventual commercial hypersonic flight.
VectorHermeus Corporation is building a Mach 5 combined-cycle engine to make New York to London a 90-minute flight - here's where they actually stand.
Vector