The Rocketdyne S-3D (Air Force designation LR79)[1] was an American liquid rocket engine produced by Rocketdyne (a division of North American Aviation) between 1956 and 1961. It was a gas generator, pump-fed engine, using a liquid oxygen (LOX) and RP-1 (kerosene) propellant combination, capable of producing 134,908 pounds of thrust (600.1 kN) at sea level.
The S-3 was based on the Redstone engine,[2] and is part of the LR79 family,[3][4][1] used on the PGM-19 Jupiter and PGM-17 Thor missiles,[5]