NOT KNOWN FACTS ABOUT APOLLO 3.5 BLUE PLUS PROCESSOR

The S-IVB also continued to thrust in a low degree by venting gaseous hydrogen, to maintain propellants settled in their tanks and stop gaseous cavities from forming in propellant feed strains. This venting also maintained Risk-free pressures as liquid hydrogen boiled off in the gas tank. This venting thrust quickly exceeded aerodynamic drag.[citat