Hermeus Flies New Supersonic Drone
Hermeus has successfully flown its latest Quarterhorse supersonic demonstrator. The flight marks a key milestone in high-speed autonomous systems, pushing the boundaries of real-time control systems and advanced avionics needed for hypersonic flight.
The recent flight of Quarterhorse Mk 2.1 at Spaceport America in New Mexico marks the beginning of its supersonic test campaign. This vehicle, comparable in size to an F-16, is powered by a Pratt & Whitney F100 engine. It is the first in a series of Mk 2 aircraft designed to explore and expand the supersonic flight envelope. Hermeus employs a rapid, iterative development strategy, with plans to design, build, and fly multiple prototypes in quick succession. This approach uses flight data from each vehicle to refine designs and accelerate progress. The Mk 1 demonstrator first flew in May 2025, and its successor, the Mk 2.1, flew less than a year later. The upcoming Mk 2.2 is expected to become the world's fastest unmanned aircraft. The company's core technology is the Chimera, a turbine-based combined cycle (TBCC) engine that functions as a hybrid between a turbojet and a ramjet. This design allows for takeoff from standard runways, with the turbojet operating at lower speeds before the ramjet takes over around Mach 3. The Quarterhorse is tasked with validating this proprietary engine technology. Future iterations will aim to break the long-standing air-breathing speed record of 2,193.2 mph, set by the Lockheed SR-71 Blackbird in 1976. The Quarterhorse Mk 3 will be equipped with the full Chimera engine and is designed to demonstrate the crucial in-flight transition from turbojet to ramjet power. This technology serves as a stepping stone for Hermeus's future planned aircraft: an uncrewed multi-mission drone for defense markets named Darkhorse, and a 20-passenger commercial hypersonic plane called Halcyon. The Atlanta-based startup has secured significant funding, including a $60 million partnership with the U.S. Air Force and a $100 million Series B funding round. Hypersonic drones offer significant military potential, including intelligence gathering, reconnaissance, and precision strikes on high-value targets. Their extreme speed and maneuverability could render many traditional air defense systems obsolete.
