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The Airframer Bulletin

Airframer · Hermeus Darkhorse · Hermeus Corporation
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Every Bulletin story and press release covering Airframer · Hermeus Darkhorse · Hermeus Corporation, newest first.

20 items

2026
9 September

ReleaseHermeus unveils Ramjet-X, a low-cost test vehicle for high-Mach flight

28 May

ReleaseHermeus scales DIU contract to $219M to demonstrate high-Mach flight for Department of War

28 May Hermeus is already building Quarterhorse Mk 2.2, with Mk 2.3 soon to follow.

Hermeus pushes Quarterhorse Mk 2.1 beyond Mach 1

Quarterhorse Mk 2.1 reaches Mach 1.21 on its third flight as Hermeus accelerates development of future high-speed military aircraft.

7 April

ReleaseHermeus reaches $1 billion valuation with $350 million raise to build today's fastest aircraft for the American warfighter

12 March

ReleaseFAA grants Hermeus Special Airworthiness Certificate for its latest Quarterhorse aircraft

2 March

ReleaseHermeus flies newest supersonic plane, delivering its second successful first flight in nine months

2025
29 May Quarterhorse Mk 1 flight operations underway at Edwards AFB as part of Hermeus’ hypersonic development roadmap.

Quarterhorse Mk 1 takes flight at Edwards as Hermeus pushes hypersonic pace

Hermeus completed testing of its uncrewed prototype in California and has begun integrating data into the forthcoming Quarterhorse Mk 2.

2024
19 December Quarterhorse Mk 1 on Edwards’ historic lakebed.

Quarterhorse Mk1 nears flight readiness at Edwards

The next iteration of Quarterhorse, Mk 2, is actively being built in Hermeus’ Atlanta factory. This aircraft features a much larger engine, the Pratt & Whitney F100, and will fly at supersonic speeds.

12 September Quarterhorse Mk 1 in the hush house, one of several buildings at HEAT.

Hermeus breaks ground on hypersonic test facility in Jacksonville

The HEAT facility will provide continuous high flow rate, high enthalpy and low-pressure conditions required for high-supersonic and low-hypersonic flight modelling.

15 May The testing marks the first major engine milestone for Hermeus’ supersonic Quarterhorse Mk 2 aircraft.

Hermeus begins precooler testing with P&W F100 engine

The precooler increases the max speed of the turbine engine by lowering the temperature of incoming air. It is intended for Hermeus' Quarterhorse Mk 2 aircraft.

3 April The coming months will see the vehicle endure a battery of tests across its subsystems, ground station, operations, and human factors to prepare it for flight test later this year.

Hermeus unveils the Quarterhorse Mk 1

Designed, built and integrated in just seven months, this is the company's second fully-integrated vehicle in the past year, following Quarterhorse Mk 0 which completed its test campaign in November 2023.

11 January

Hermeus progresses testing of Quarterhorse speed record contender

Hermeus' first flight vehicle, Quarterhorse Mk 1, is actively being built and scheduled to fly in 2024. Leveraging rapid and iterative design is how Hermeus will accelerate development on timelines relevant to its customers.

2022
22 December The Pratt & Whitney F100 engine.

Hermeus builds F100 into hypersonic engine

Chimera II is a hypersonic turbine-based combined cycle engine - a hybrid between a turbine engine and a ramjet. This allows for both low-speed and high-speed operation.

1 September

Hermeus invests in Sapphires for metal additive production

The Velo3D printers, both of which will be calibrated for Inconel 718, will be used to build parts for Hermeus' Chimera engine and Quarterhorse aircraft.

12 May

ReleaseRaytheon Technologies venture capital group invests in Hermeus

10 March

ReleaseHermeus raises $100 million Series B led by Sam Altman

2021
5 August

ReleaseHermeus fully-funded to flight with $60 million U.S. Air Force partnership

13 May Hermeus will build its first aircraft in the new factory in Atlanta.

Hermeus secures factory for Mach 5 aircraft manufacture

A large facility in Atlanta will allow Hermeus to manufacture in an urban environment, while being just a few miles from Dekalb-Peachtree airport. It will house assembly, manufacturing and testing operations.

18 March

ReleaseHermeus teams with NASA on development of the fastest commercial aircraft

2020
6 August

ReleaseHermeus wins Air Force investment after demonstrating Mach 5 engine