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Slings at Anchors 30-Sep-2014 At 4:56:27 PM patto

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The "force" somebody can withstand depends on where, how and how long it is applied for.

The guy I linked about experienced a painful 9kN. (We really aren't talking about organ damage here though, more pelvis bruising and whiplash to back/neck.)

John Stapp was subjected to forces of over 34kN! (46.2G!) (Though that did temporarily blind him and give him a host of other non life threatening injuries.)
(http://en.wikipedia.org/wiki/John_Stapp)
(https://www.youtube.com/watch?v=s4tuvOer_GI)

-In a top rope "fall" the peak forces are around 1.6kN.
-A decent lead fall is probably around 4.5kN.
-A factor 1 fall is around 6kN. (So people rope jumping would experience around 6kN)
-A factor 2 fall is around 8kN.
(http://bealplanet.com/sport/anglais/forcedechoc.php)

(A factor 1.77 fall has to be less that 12kN for an 80kg person according to UIAA.)