text: First stageEngines9 Merlin 1DThrustSea level: 7,607 kN (1,710,000 lbf) Vacuum: 8,227 kN (1,850,000 lbf)Specific impulseSea level: 282 seconds Vacuum: 311 secondsBurn time162 secondsFuelSubcooled LOX / Chilled RP-1Second stageEngines1 Merlin 1D VacuumThrust934 kN (210,000 lbf)Specific impulse348 secondsBurn time397 secondsFuelLOX / RP-1