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Just to check my math, this would be the same equation as a ballistic pendulm. A 15 M/sec speed would result in the survivor swinging to a maximum height of 11.48 meters, with the maximum G load based on the cosine of the length of the line. A line 23 meters long wouls result in a 2G max load.

The design would be trainling a line with a hook, rather like a fighter's tail hook, which would snag a loop held horizontal above the survivor.