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

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…

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 …

Hermeus' Quarterhorse Mk 2.1 Aircraft Goes Supersonic In First For Unmanned Flight

Less than three months after the first flight of the Quarterhorse Mk 2.1 unmanned aircraft, Hermeus on Tuesday said the jet-powered aircraft achieved supersonic speeds in its second flight, a […]

Hermeus Achieves Its First Unmanned Supersonic Flight

The historic flight cements Quarterhorse Mk 2.1 as the world’s first privately-developed unmanned supersonic jet and the fastest unmanned aircraft flying today. It also makes Hermeus the fastest company in aviation history to go from founding to supersonic flight. LOS ANGELES, May 26, 2026 /PRNewswire/ — Hermeus, the defense aviation company building the world’s fastest aircraft, today announced its Quarterhorse Mk 2.1 successfully completed its…