Length 77.5 m Diameter 12 m Dry Mass 275 t Propellant Mass 6,700 t Raptor Engines 42 Sea Level Thrust 128 MN Vacuum Thrust 138 MN Booster accelerates ship to staging velocity, traveling 8,650 km/h (5,375 mph) at separation Booster returns to landing site, using 7% of total booster prop load for boostback burn and landing Grid fins guide rocket back through atmosphere to precision landing