|Country of origin||United States|
|Propellant||LOX / RP-1|
|Thrust (sea-level)||134908 lbf (600.1 kN)|
|Specific impulse (sea-level)||247 seconds (2.42 km/s)|
|PGM-19 Jupiter, PGM-17 Thor|
The Rocketdyne S-3D is an American liquid rocket engine produced by Rocketdyne between 1956 and 1961 for use on the PGM-19 Jupiter and PGM-17 Thor missiles, and the Juno II rocket. Its design was used later as the basis for the H-1 rocket engine of the Saturn I, and the Rolls-Royce RZ.2 of the Blue Streak.
It belongs to the LR79 engine family.