"ATC" Belay device - Suits 9-11mm ropes - Great all-rounder.
Anodised Platinum. (Bronze?) Only 1 left!
Chockstone Forum - Gear Lust / Lost & Found
Rave About Your Rack Please do not post retail SPAM.
|Impact factor calculations and microwire placement
||Monday, 23 November 2009 At 7:23:42 AM
|Ittake a while to churn through that doesn't it.
The important point is that if a piece pulls it doesn't really absorb much energy or slow you down much:- Attaway did a nice paper where he showed that with equally spaced equally bad gear and the top piece fails, they will all fail. So you need to eiother equalise a bunch of bad gear, or climb on doubles (the load is spread over 2 pieces if they are within a meter or two so only half the load comes on each, and the impact force of a thin rope is less).
Or get your belayer to let slip the rope.
The Wexler equation covers all this, I don't have a web reference for it, but it was a neat piece of work which invented the "fall factor" long before we had nylon ropes.
Attaway also had a more accurate fit to rope forces
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