On Tuesday, May 21, 2019 at 2:15:19 PM UTC-4, Niklas Holsti wrote:
The SpaceX plans for the first Mars trips involve two Starships making
the trip at the same time. The SpaceX videos show a Starship flying
alone, in a fixed attitude (pointing away from the Sun) thus in free
fall. From other sources there is some concern that a multi-month
weightless trip may incapacitate the pilots and passengers, for example
resulting in blurred vision when they are again subjected to
acceleration or gravity. Here I propose a possible solution: cable the
two Starships together in a nose-to-nose attitude and rotate them to
provide simulated gravity during the trip.

Do you have any numbers on this? How much propellant would be necessary to spin up the rotation? Would it be necessary to despin them upon arrival, or are you going to just cut the cable and let the two ships float off into different orbits?