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Topic Date User

Clipping in with a daisy chain 8-Sep-2010 At 7:18:37 PM Richard Delaney

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There has been heaps of testing done about this stuff.
I even did some to scare overzealous staff using daisy chains for a bit too much. We dropped 80kg of weights onto my old BD daisy. The weights were lifted above the anchor to the length of the daisy and then dropped to what would hove been a free hanging position below - except, predictably, the daisy snapped and dropped the weights to the ground.
Daisies are fine when clipped to something at, or above, waist height and kept in tension.

Re: dynamic vs static rope cows tails.
I don't have the ref to the paper here but if you google the British HSE tests for lanyards I'm sure it'll turn up quickly. Bottom line, 11mm dynamic rope cows tails with knots at both ends perform almost as well as lanyards with built in energy absorbing units - ie they limited the peak impact force to about 6kN.
Life-on-a-line points out the same - suggesting the barrel knot at the biner, fig8 knot at harness configuration as the best. Static rope performed significantly worse as did any rope with sewn terminations.

Richard