EngineJ-2XDrag to turn · Space takes it apart1,307 kN vac · 2,470 kg · cold
J-2X by Pratt & Whitney Rocketdyne: gas generator engine burning LH2 / LOX (tested, cancelled). Thrust 1,307 kN in vacuum. 89 bar chamber pressure, 448 s in vacuum, 2,470 kg dry. Figures from the database's engine record. Proportions are estimated.