Video: Hermeus completes first flight of Quarterhorse Mk 2.1

Hermeus, an Atlanta-based aerospace startup backed by venture capital, announced Monday that its latest prototype, the Quarterhorse Mk 2.1, has completed a maiden flight.

The flight, conducted over the airspace of White Sands Missile Range from Spaceport America in New Mexico, was remotely piloted from Hermeus’ ground-based flight deck and was intended to validate the aircraft’s systems, handling qualities, and operational procedures ahead of a planned supersonic test campaign.

The aircraft, roughly the size of an F-16 fighter jet and powered by a Pratt & Whitney F100 engine, is nearly three times larger and four times heavier than the company’s earlier Quarterhorse Mk 1, which first took to the skies in May. While the Mk 1 demonstrated Hermeus’ rapid, iterative development model, the Mk 2.1 is designed to fly at speeds exceeding Mach 1, making it one of the largest unmanned platforms ever built for high‑speed flight.

"Speed is the fundamental requirement for our flight systems and for our company," said AJ Piplica, CEO and founder of Hermeus. "We're building and flying aircraft on timelines that match the urgency of the world we're in. Today's flight kicks off a critical flight test campaign that will ultimately get us to supersonic speeds, bringing the United States closer to having the high-speed capability it needs now, not decades from now."

The current Mk 2 phase aims to achieve and expand supersonic capability through a succession of prototypes, each larger and more capable than its predecessor. According to the company, the subsequent Mk 2.2 prototype is slated for a flight later this year, and later phases will focus on unlocking sustained ramjet-powered cruise—an ambition Hermeus hopes to realize for the United States by the end of the decade.

The successful flight of Quarterhorse Mk 2.1 adds momentum to Hermeus’ broader effort to field next-generation, high-speed unmanned aircraft for defense and security applications. As the program moves into the next stage of testing, observers will watch how the company balances rapid development with the stringent safety and reliability standards required for operational deployment.