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Getting to Mars With The Reusable Falcon 9

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Isn't it a bit odd that the most promising reusable launch vehicle under development today is being build by a company with a proclaimed love for heavy-lift launch vehicles?As the Falcon 9 Reusable approaches the cusp of operations, with a successful demonstration of first stage reuse expected sometime next year, SpaceX is already moving on to a methane engine - Raptor - four times as big, for a rocket - MCT - with a much larger core size.This, we're told, is Elon Musk's strategy for going to Mars and it's so much warmed over Bob Zubrin - Mars Direct, Mike Griffin - Apollo On Steroids, cargo cult of the Saturn V, stuck-in-the-1960s thinking.If you have an operational reusable launch vehicle, as SpaceX says it is their goal to have, then there's much more sensible ways to get to Mars. Come on boffins, get the lead out, let's do the math on this one.
According to the best public numbers I can find, the second stage of the Falcon 9 v1.1 has a dry mass of 4,900 kg a…