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Hermeus Quarterhorse Breaks Sound Barrier

May 26, 2026

2 min read

Key Takeaways

Hermeus Quarterhorse Mk 2.1 reached Mach 1.21 in a test flight.
The aircraft is the world's first privately developed uncrewed supersonic jet.
The flight took place at Spaceport America in New Mexico.
Hermeus plans to continue the flight-test campaign.

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Strategic Implications

Hermeus' achievement may indicate significant progress in private supersonic aircraft development, which could have implications for the defense industry and high-speed flight capabilities. The company's roadmap suggests a focus on sustained high-Mach flight, which could lead to advancements in military and commercial applications.

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What Happened

Private Supersonic Jet Achieves Mach 1.21 In Test Flight

Hermeus, an Atlanta-based defense aviation company, announced that its Quarterhorse Mk 2.1 uncrewed aircraft has completed its first supersonic flight, reaching Mach 1.21 during a test flight at Spaceport America in New Mexico. The aircraft is part of Hermeus’ roadmap toward faster uncrewed systems, with plans to continue the flight-test campaign and build subsequent aircraft for higher-speed test points. The company has received US Air Force backing for its high-speed aircraft development, with a $60 million jointly funded contract awarded in 2021. This development was first reported by AeroTime.

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