Terminal velocity is typically around ~200mph, but depends on the drag factor. Vertical impact with the ground is not survivable without a considerable crush zone (for example 10m crush zone from 80m/s gives an average of 16g for 1/4 of a second, which is probably quite survivable)
A man-rated SSTO is quite a sizeable vehicle -- if the tanks are designed to crush properly and the crew cabin is on top, you will have at least 10m through which to decelerate. IIRC, ppl have take 16 G continuos on their backs with their legs up -- it should be no problem whatsoever.
-p
Mars or Bust! www.marssociety.com
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