NOT KNOWN FACTS ABOUT APOLLO 3.5 BLUE PLUS PROCESSOR

The S-IVB also ongoing to thrust at a low level by venting gaseous hydrogen, to maintain propellants settled in their tanks and forestall gaseous cavities from forming in propellant feed lines. This venting also preserved Protected pressures as liquid hydrogen boiled off in the fuel tank. This venting thrust simply exceeded aerodynamic drag.[citati