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Re:SpaceX installed 29 Raptor engines on a Super Heavy rocke... by Ajedi32 on Tuesday August 03, 2021 @10:19AM (#28049495)
Probably closer to half the price of the RS-25 then, assuming normal Merlins are made mostly out of steel:

https://www.wolframalpha.com/input/?i=%28%28%28630+kg+*+%28d...

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