Rotating Detonation Engines (RDE) have been flown by Venus Aerospace. They use continuous detonation waves for propulsion and provide 15% efficiency gains (in specific impulse or fuel consumption) ...

The ATLAS Flight Test Vehicle. Credit: GE Aerospace GE Aerospace on Sept. 22 announced it conducted supersonic captive-carry flight tests of a new solid-fueled ramjet, a milestone in the company's ...