NOT KNOWN FACTS ABOUT APOLLO 3.5 BLUE PLUS PROCESSOR

The S-IVB also ongoing to thrust at a small stage by venting gaseous hydrogen, to help keep propellants settled in their tanks and stop gaseous cavities from forming in propellant feed lines. This venting also maintained Harmless pressures as liquid hydrogen boiled off while in the fuel tank. This venting thrust simply exceeded aerodynamic drag.[ci