THE SMART TRICK OF AMBIQ APOLLO3 THAT NOBODY IS DISCUSSING

The S-IVB also continued to thrust in a very low 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 within the gasoline tank. This venting thrust simply exceeded aerodynamic drag.[c