NOT KNOWN FACTS ABOUT APOLLO 3.5 BLUE PLUS PROCESSOR

The S-IVB also ongoing to thrust at a very low stage by venting gaseous hydrogen, to keep propellants settled of their tanks and stop gaseous cavities from forming in propellant feed lines. This venting also managed Safe and sound pressures as liquid hydrogen boiled off inside the fuel tank. This venting thrust quickly exceeded aerodynamic drag.[ci