text: First flight2020 (planned)First stage – Super HeavyLength63 m (207 ft)Diameter9 m (30 ft)Gross mass3,065,000 kg (6,757,000 lb) Engines31 × RaptorThrust61.8 MN (13,900,000 lbf)Specific impulse330 s (3.2 km/s)FuelSubcooled CH4 / LOXSecond stage – StarshipLength55 m (180 ft)Diameter9 m (30 ft)Empty mass85,000 kg (187,000 lb) Gross mass1,335,000 kg (2,943,000 lb) Propellant mass