Momentus

A proprietary subsystem designed to manage thermal loads during hypersonic flight, enabling high reusability of the aircraft.

A jet engine fueled by hydrogen that operates during takeoff, landing, and initial climb phases, allowing the aircraft to integrate with conventional airspace.

A rocket engine powered by liquid hydrogen that provides hypersonic acceleration once the aircraft reaches a certain altitude and speed threshold.

Switzerland

Development of a near-space hydrogen-powered aircraft designed to achieve hypersonic speeds and enable global travel in 1–2 hours. The aircraft will use hydrogen airbreathing jet engines for conventional flight and cryogenic hydrogen rocket engines for hypersonic acceleration.

A near-space aircraft designed to fly anywhere on Earth in 1–2 hours using hydrogen propulsion. The aircraft combines hydrogen airbreathing jet engines for conventional flight with cryogenic hydrogen rocket engines for hypersonic acceleration.