Studied with the Saturn A-1 in 1959, the Saturn A-2 was deemed more powerful than the

Saturn I The Saturn I was a rocket designed as the United States' first medium lift launch vehicle for up to low Earth orbit payloads.Terminology has changed since the 1960s; back then, 20,000 pounds was considered "heavy lift". The rocket's first stag ...

rocket, consisting of a first stage, which actually flew on the

Saturn IB The Saturn IB (also known as the uprated Saturn I) was an American launch vehicle commissioned by the NASA, National Aeronautics and Space Administration (NASA) for the Apollo program. It uprated the Saturn I by replacing the S-IV second stage (, ...

, a second stage which contains four S-3 engines that flew on the

Jupiter IRBM The PGM-19 Jupiter was the first nuclear armed, medium-range ballistic missile (MRBM) of the United States Air Force (USAF). It was a liquid-propellant rocket using RP-1 fuel and LOX oxidizer, with a single Rocketdyne LR79-NA (model S-3D) roc ...

and a

Centaur A centaur ( ; grc, κένταυρος, kéntauros; ), or occasionally hippocentaur, is a creature from Greek mythology with the upper body of a human and the lower body and legs of a horse. Centaurs are thought of in many Greek myths as being ...

high-energy liquid-fueled third stage.

References

* Koelle, Heinz Hermann, ''Handbook of Astronautical Engineering'', McGraw-Hill, New York, 1961. * Bilstein, Roger E, ''Stages to Saturn'', US Government Printing Office, 1980. . {{Saturns Saturn (rocket family) Cancelled space launch vehicles