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The Press Reference section on the third stage states The continuous vent system is used to provide a thrust force required to position propellants at the aft end of each tank during coast. So there was a requirement to settle the propellants between burns. The reason for this requirement is not given in this source. Speculation: to prevent the mass ...


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The detailed flight log at apollosaturn.com reports that "exterior markings remained identical for all vehicles" from Apollo 9 onwards. However, there were still some slight variations, even if the paint markings were the same. For example, they note that the Saturn II insulation type changed. The instrument unit had some more visible differences. ...


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