Nice estimation. I also don't fully understand how they arrived at 190 GW. For the purposes of a "back of the envelope" calculation to account for the entire c

Nice estimation. I also don't fully understand how they arrived at 190 GW. For the purposes of a "back of the envelope" calculation to account for the entire capability of the Saturn V: Based on the 180,000,000 HP figure, we can (naively) estimate: Stage 1: 180,000,000 HP (7,500,000 pounds of thrust from 5 F-1 engines) Stage 2: 27,870,000 HP (1,161,250 pounds of thrust from 5 J-2 engines) Stage 3: 5,574,000 HP (232,250 pounds of thrust from 1 J-2 engine) That's a total (non-simultaneous) output of 213,444,000 HP... the equivalent of 159.17 GW (!) That's simply massive. https://en.wikipedia.org/wiki/Rocketdyne_J-2 https://en.wikipedia.org/wiki/Rocketdyne_J-2