NOT KNOWN FACTUAL STATEMENTS ABOUT APOLLO4 BLUE PLUS

The S-IVB also ongoing to thrust at a very low level by venting gaseous hydrogen, to keep propellants settled of their tanks and forestall gaseous cavities from forming in propellant feed lines. This venting also managed Secure pressures as liquid hydrogen boiled off in the fuel tank. This venting thrust effortlessly exceeded aerodynamic drag.[ci