Steve Trimble
May 26, 2026

Hermeus

Quarterhorse demonstrator achieves supersonic flight.

Credit: Hermeus

High-speed aircraft maker Hermeus flew the Quarterhorse Mk 2.1 demonstrator aircraft above supersonic speed for the first time, marking a first for a privately funded, uncrewed aircraft in the U.S. The Pratt & Whitney F100 engine-powered Quarterhorse reached a top speed of Mach 1.21 on the aircraft…

Steve Trimble

Steve covers military aviation, missiles and space for the Aviation Week Network, based in Washington, DC.

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