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I got something wrong in the first post. I misread the propellant mass and was only looking at the second stage. So, multiply the water production by a factor of 4. Not half a million launches, but 1/4 of that. So the water constraint on launches is even worse than I was saying (this is likely what led to the downvote?)


Re: downvotes — I never ask when I get them, and I didn't vote either way.

(I think even asking that is frowned on?)


Well, I've never been dinged for it, but I'll stop if that's the case.

It would have been more useful to get a critique there; I could even have corrected the post before the edit window ended.




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