Rocketdyne LOx/LH2 rocket engine. Study 1966. High-performance high-pressure chamber engine developed from the J-2, fitted with lower-expansion nozzle for sea level use on Saturn INT-17. Technology led to Space Shuttle Main Engines.
Status: Study 1966. Thrust: 1,387.00 kN (311,810 lbf). Specific impulse: 450 s. Specific impulse sea level: 360 s.