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Can you elaborate on the Saturn V a bit more?

This came up when people started looking sideways at the ballooning costs of the Space Launch System. Even though we have extensive blueprints and even parts left over from Saturn V rockets, the institutional knowledge to use any of those things simply doesn't exist anymore, and would have to be re-created at exceptional cost of you wanted to build another one.

https://space.stackexchange.com/questions/6281/why-not-build...

IIRC, even if we could, we can do better. For example a Saturn V engine is around 5,000 parts, though we've lost the knowledge to assemble them. However, a contemporary study of that found that, with modern manufacturing techniques, you can build an equivalent today with just 40 parts.

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