Wernher von Braun and Some others also had programs to get a rocket that would have showcased 8 F-1 engines in its to start with phase, like the Saturn C-eight, letting a direct ascent flight towards the Moon. Other plans with the Saturn V named for using a Centaur https://embedded-systems10852.goabroadblog.com/31885376/indicators-on-apollo4-blue-plus-you-should-know