NOT KNOWN FACTS ABOUT APOLLO 3.5 BLUE PLUS PROCESSOR

The S-IVB also ongoing to thrust in a lower degree 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 Risk-free pressures as liquid hydrogen boiled off inside the fuel tank. This venting thrust quickly exceeded aerodynamic drag.[citation