US start-up Hermeus has flown its first supersonic-capable aircraft, the Quarterhorse Mk 2.1, marking a significant step ...

For the second time in just over nine months, an Atlanta-based company this week debuted a new supersonic test aircraft.

COLORADO SPRINGS—Sierra Nevada Corporation (SNC) and startup Specter Aerospace plan to develop and flight test a supersonic ...

Hermeus says it flew Quarterhorse Mk 2.1 at Spaceport America, launching a flight-test campaign aimed at reaching supersonic ...

American defense contractor Hermeus announced it conducted the first flight of the Quarterhorse Mk 2.1 prototype, will ...

Hermeus successfully flew its latest Quarterhorse aircraft, marking the company’s second first flight in less than a year.

Ursa Major has successfully hot-fire tested the latest variant of its Hadley liquid rocket engine for the first time. The engine, which is flight-proven, has recently undergone a series of design ...

The Air Force awarded four engine development contracts to support future Collaborative Combat Aircraft and autonomous platforms.

Rolls-Royce has completed key tests on its F130 engine, which will eventually power the ...

Long after luxury brands quit the format, GMC quietly built a massive V-12 for trucks and heavy-duty work. Here’s how it happened.

Touring car racing was growing in popularity through the 1980s, with various regional series and championships for modified ...

Public financing is being sought for developing a scaled version of the UltraFan geared turbofan propulsion system, under consideration to help Rolls-Royce return to the ...