US: World’s most advanced rocket engine tested for hypersonic drones

The US startup New Frontier Aerospace (NFA) has successfully completed critical fire tests of its Mjölnir rocket engine, a cutting-edge propulsion system designed for next-generation hypersonic drones and space vehicles. Unlike most aerospace engines that use RP-1 or liquid hydrogen, Mjölnir runs on liquid natural gas (LNG), which is a cleaner-burning fuel and can become net carbon-negative when sourced from bio-waste. The engine features a full-flow staged combustion cycle—an advanced architecture that improves efficiency, thrust-to-weight ratio, and engine longevity—and is 3D-printed to reduce manufacturing costs and enable rapid development. Supported by NASA and the Defense Innovation Unit, Mjölnir demonstrated stable ignition, precise throttle control, and consistent thermal performance, confirming its reliability as a main propulsion system. Mjölnir is set to power two key NFA platforms: Pathfinder, a hypersonic vertical takeoff and landing (VTOL) unmanned aerial system aimed at rapid military