The Saturn C-4 was the fourth rocket in the Saturn C series studied from 1959 to 1962. The C-4 design was proposed in 1960 for a three-stage launch vehicle that could launch 99,000 kg (218,000 lb) to Low Earth orbit and send 32,000 kg (70,000 lb) to the Moon via Trans-lunar injection. It met the initial requirements for a lunar orbit rendezvous and lunar landing mission.It would have consisted of three stages; an S-IB-4 first stage, a S-II-4 second stage and a S-IVB third stage.