NOT KNOWN FACTS ABOUT APOLLO 3.5 BLUE PLUS PROCESSOR

The S-IVB also ongoing to thrust in a lower stage by venting gaseous hydrogen, to help keep propellants settled within their tanks and forestall gaseous cavities from forming in propellant feed lines. This venting also taken care of safe pressures as liquid hydrogen boiled off inside the gas tank. This venting thrust very easily exceeded aerodynami