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This thing is so cavernous inside that you could spin it up with the axis down the center line of the ship, and you would achieve about 4% of Earth gravity at 2 rpm. Put two of these end-to-end, and spin it up at 2 rpm may give an approximation of Mars gravity at each end.
There may have been a write-up about this previously. Also, there may be an economy of scale with larger vehicles. By doubling its diameter from Starship 1, you get 8 times the volume. This may also lead to better mass ratios to orbit.
It would likely require a more powerful engine. The mass would be 8 times as much as well. It seems that someone said you'd need Saturn V engine size, and about 60 of them. Whoa! Just imagine that thing taking off. It would tear the sky apart with the noise.
A thousand people per trip would require a thousand launches to get your million people on Mars. A hundred ship fleet of these over the course of twenty years to get the job done. That's 10 trips per ship times a hundred ships times a thousand people per ship.
This probably stretches a few limits as to feasibility. The video follows:
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