Hypersonic developer Hermeus has begun testing a proprietary pre-cooler technology that will allow a standard Pratt & Whitney F100 jet engine to operate at higher speeds and with greater efficiency.

Hermeus’ engine successfully shifted from turbojet to ramjet power during trials at Notre Dame Lab.

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Japan has picked a pre-cooled turbojet as the core of the ATREX expander-cycle air turbo ramjet under research for potential application in the air-breathing flyback booster of a future two-stage ...

COLORADO SPRINGS—Hypersonic aircraft developer Hermeus has started tests of its pre-cooler system with the Pratt & Whitney F100-229 engine, which will power the company’s Quarterhorse Mk. 2 ...

At low speeds, Chimera is in turbojet mode – just like any jet aircraft. At higher speeds, Chimera bypasses the incoming air around the turbojet and the ramjet takes over completely. Chimera utilizes ...

In the TikTok video showing it all off, the machine had not yet actually been turned on, as the team still had to fill it with water. The presenter says it "looks like a steam engine" and I don't ...

In this concept the engine, which was ground tested, would have been boosted with a water-oxygen mix through a system dubbed MIPCC (Mass Injection Pre-Compressor Cooling).