NOT KNOWN FACTS ABOUT APOLLO 3.5 BLUE PLUS PROCESSOR

The S-IVB also ongoing to thrust in a reduced stage by venting gaseous hydrogen, to keep propellants settled inside their tanks and stop gaseous cavities from forming in propellant feed lines. This venting also managed safe pressures as liquid hydrogen boiled off from the gas tank. This venting thrust simply exceeded aerodynamic drag.[citation requ