US: New Hermeus Supersonic Jet Hits Mach 1.21 Speed in Milestone Test

Hermeus aircraft hits Mach 1.21 in supersonic test at Spaceport America

The Quarterhorse Mk 2.1 unmanned aircraft reached a top speed of Mach 1.21 in its third test flight. The company has been testing at the facility since fall 2025.

US: New Hermeus supersonic jet hits Mach 1.21 speed in milestone test

On Monday, the Atlanta-based aerospace company Hermeus confirmed a key flight milestone after its Quarterhorse Mk 2.1 aircraft broke the sound barrier during testing in New Mexico. The uncrewed plane reached Mach 1.21 on its third flight, which took place at Spaceport America in the restricted airspace above White Sands Missile Range. Mk 2.1 achieved supersonic performance less than three months after its first flight in early March. It also com…

US’ Hermeus supersonic jet breaks sound barrier at Mach 1.21 in high-speed flight test

On Monday, the Atlanta-based aerospace company Hermeus confirmed a key flight milestone after its Quarterhorse Mk 2.1 aircraft broke the sound barrier during testing in New Mexico. The uncrewed plane reached Mach 1.21 on its third flight, which took place at Spaceport America in the restricted airspace above White Sands Missile Range. Mk 2.1 achieved […] The post US’ Hermeus supersonic jet breaks sound barrier at Mach 1.21 in high-speed flight t…

Hermeus Quarterhorse Mk 2.1 breaks sound barrier

Hermeus said 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 Atlanta-based defense aviation company announced the milestone on May 26, 2026, saying the flight took place over White Sands Missile Range airspace. Hermeus describes Quarterhorse Mk 2.1 as the world’s first privately developed uncrewed supersonic jet. The aircraft reac…

Hermeus’ Quarterhorse Mk 2.1 hits Mach 1.21 in first supersonic flight

Hermeus has completed the first supersonic flight of its high-Mach remotely piloted aircraft, Quarterhorse Mk 2.1.

Hermeus Quarterhorse Mk 2.1 reaches mach 1.21 in company’s first unmanned supersonic flight

The company said the milestone highlights its pace of iterative aviation development. Quarterhorse Mk 2.1 flew supersonic less than three months after its first flight and 364 days after the maiden flight of Hermeus’ first aircraft, Mk 1. “Our customers at the Department of War are paying close attention to how fast this program is moving,” said AJ Piplica, CEO and Co-founder of Hermeus.     “This flight demonstrates a pace of execution that is …