Hermeus MK 2.1 Quarterhorse Takes Off The latest news from Hermeus is that they have flown the latest iteration of the Quarterhorse demonstrator , the MK 2.1. The flight kicks off a test campaign that will see the unmanned aircraft reach supersonic speeds. The next-generation Quarterhorse builds directly on the successful first flight of Hermeus’ first aircraft, Mk 1, in May 2025, which validated the company's rapid, iterative development approach. Roughly the size of an F-16 and powered by a Pratt & Whitney F100 engine, Quarterhorse Mk 2.1 is nearly three times larger, four times heavier, and significantly faster than its predecessor, making it one of the largest unmanned aircraft ever built.
“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 flight was conducted at Spaceport America over White Sands Missile Range airspace in New Mexico. Quarterhorse Mk 2.1 was flown remotely from Hermeus’ ground-based flight deck, validating aircraft systems, handling qualities, and operational procedures.
The company is currently in the Mk 2 phase of the program, a multi-aircraft series focused on achieving and expanding supersonic flight. Quarterhorse Mk 2.1 is the first of multiple planned aircraft in Hermeus’ Mk 2 program, followed closely by Mk 2.2, which is expected to become the world’s fastest unmanned aircraft. Subsequent phases will continue to push towards Hermeus’ end goal of unlocking sustained ramjet-powered flight for the United States — this decade. For more information: Hermeus 1954 Airport Rd Atlanta, Georgia 30341 www.hermeus.com ***
