Wernher von Braun and Some others also had ideas for a rocket that would have showcased 8 F-one engines in its initially phase, much like the Saturn C-8, allowing for a immediate ascent flight for the Moon. Other ideas for the Saturn V identified as for utilizing a Centaur https://rowanmmklh.blogvivi.com/27160872/apollo-3-5-blue-plus-processor-an-overview