Saturn V-4X(U) 1 Million Pound Payload: The Beast

Boeing 1968 study, four improved Saturn S-IC first stage stretched TO 498 inches with million pounds propellant and 5 F-1 engines each and 4 S-II second stage with 5 J-2 engines and a payload shroud of 86.5 feet in diameter and 240 feet long for a payload of over 1 million pounds