General Hypersonics develops rotating detonation rocket engines for hypersonic propulsion applications. The technology uses continuous detonation waves to achieve higher specific impulse and thrust-to-weight ratios compared to traditional rocket engines. Their systems target hypersonic missiles, cruise missiles, and boost-glide vehicles. Primary customers include U.S. Department of Defense prime contractors and government agencies. The company emerged from stealth in 2024 and raised $5.8 million in seed funding led by Scout Ventures, with participation from Fifty Years and others. Founded by Mark McDonald, previously at SpaceX, and a team with experience from NASA, Blue Origin, and Lockheed Martin. They operate test facilities to validate engine performance at hypersonic speeds.