I question whether a human can take the G-forces that will arise when the crew member is in the vertical orientation. NASA (and I suspect the other agencies who have delivered people to space) always have the G-force against the spine (crew members face in the direction of travel). They've learnt that for a reason.
Maybe blood loss from brain - maybe uncomfortable warm then cold experience in pants...
I think its about eight minutes with existing technologies to reach space.
Mark C.
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