Hypersonic: Hermeus completes ground testing ahead of Quarterhorse Mk 1 first flight

The US hypersonic flight start-up is preparing to launch a test campaign for its Quarterhorse Mk 1 vehicle, a subsonic fixed-wing jet that will be used to evaluate systems intended for use on subsequent supersonic and hypersonic Quarterhorse models.

https://www.flightglobal.com/fixed-wing/hermeus-completes-ground-testing-ahead-of-quarterhorse-mk-1-first-flight/161152.article