THE SMART TRICK OF AMBIQ APOLLO3 THAT NOBODY IS DISCUSSING

The S-IVB also continued to thrust in a minimal amount 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 preserved Secure pressures as liquid hydrogen boiled off during the gas tank. This venting thrust quickly exceeded aerodynamic drag.[ci