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first, hi there, first time reading this blog, interesting stuff.

I just wanted to say, that SpaceX might not even need or want any heavier lift than Falcon V will provide. What i believe they will do when (or if ) F-V has proven itself is to look for major cost reductions in its design with new and as of yet untested technologies.
Full reusability, getting rid of turbopump and replacing it with something like Flometrics has ( ), getting rid of expensive range safety equipment etc.
I think Falcon-I and V are very traditional designs just to build confidence, followons will probably be much more novel, with entire focus on building/operating the rocket at the cheapest possible cost.
Thats all speculation, though. Its entirely possible that they have a Sea Dragon clone in the pipeline.

Dan Schmelzer

Hi Kert. Welcome to my blog.

Assuming that they are successful using their current business plan, why would they choose novel designs instead of playing out their low price hand fully with technologies and processes that they know well? In this sense, turbopumps are the devil that SpaceX knows.

The cleanest apparent intersection of Bigelow Aersopace's and SpaceX's publicly-stated plans seems to be a heavier rocket than the Falcon V -- one capable of flying the Bigelow Nautilus module at 50,000 pounds or bulk cargo of the same weight for a price of about $30 million per flight. They could work on the manned components of the Falcon V that are essential to Bigelow's plans parallel to the development of a new rocket.

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