This is a main engine from a Saturn V rocket. Presumably it's a replica since the main stage was lost during launch and there were few spare Saturn Vs all of which are in America as far as I know. It's still the most powerful liquid rocket engine ever, and the fuel pump alone was driven by a 55,000 horsepower generator which delivered 2 tons of fuel/air per second!
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My latest blog post: Think for Yourself: In the end, everything is just an opinion. Be skeptical, and think for yourself! (posted 2026-04-25).