High Quality Content by WIKIPEDIA articles! Falcon Heavy (FH), previously known as the Falcon 9 Heavy, is a spaceflight launch system being designed and manufactured by SpaceX. Both stages of the two-stage-to-orbit vehicle use liquid oxygen (LOX) and rocket-grade kerosene (RP-1) propellants, on a SpaceX-designed rocket engine, the Merlin 1D. Multiple variants are planned with payloads of 53,000 kilograms (120,000 lb) to low Earth orbit (LEO), and 12,000 kilograms (26,000 lb) to geostationary transfer orbit (GTO).