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The Sea Dragon rocket was a concept put forth by Robert Truax in 1962. It was a proposal for a two stage launch vehicle capable of putting over 500 tons into LEO, potentially at a cost of around $100/kilo.
First off, do y'all think this concept would have been feasible, and able to deliver the stated performance goals?
Second, how might our space program look different if this program had in fact been successful. I think we would have a much larger presence in LEO, with such a (relatively) cheap launch capability.