The consequence of adding reusable technology will mean that the Falcon Heavy will have a reduced payload to GTO.
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The FH can also launch as an expendable with more payload and still be cost effective compared to the competition. While FH will have two thirds the thrust of the Saturn, I think the Saturn carried a lot more fuel and had three stages.
Yeah that’s right about the S5. Still there are many of us that would like to see the S5 reborn, but we are just wishing - couldn’t build it now if we tried.
Perhaps the BFR will actually work and the US can get back in the game. But then ... I read a year or two ago that the Russians are developing a new type of rocket tech which would equal or superseed the BFR - how far along that project is now, I have no idea.