blog image May, 2025
Hermeus Achieves Historic Milestone: First Flight of Quarterhorse Mk 1 Hypersonic Demonstrator

Hermeus, a venture capital-backed aerospace company, successfully completed the first flight of its Quarterhorse Mk 1 hypersonic aircraft demonstrator at Edwards Air Force Base. The milestone represents unprecedented development speed, taking the clean-sheet design from concept to flight-ready in just over a year. The achievement demonstrates the viability of Hermeus' iterative development approach for high-speed aircraft capable of exceeding Mach 3 speeds. The test campaign validated aerodynamics, stability, control systems, and various subsystems including propulsion, fuel systems, and avionics.

Mk 1 has redefined the pace of developing and flying new aircraft. We've proven the viability of our iterative development approach, representing the fastest development time for a jet aircraft in the last eight decades. - AJ Piplica, CEO

The company is actively integrating lessons learned into Quarterhorse Mk 2, currently under construction and scheduled to fly later this year. The F-16-scale Mk 2 will serve as a high-Mach aircraft designed to de-risk uncrewed supersonic flight operations and enable novel defense capabilities.

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