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> I'm wondering if there's any particular reason not to girth hitch the
>kind of accessory cord that hexes are slung on with sewn Spectra. It
>was a case in which a biner clipped to the cord of the hex would be
>loaded over an edge, and the best way I had to extend it was to girth
>hitch a sewn sling (Trango ultratape, if it matters). Context is a TR
>anchor in a horizontal crack. I can't think of any particular reason
>not to do this (given that girth hitching weakens the slings somewhat,
>but it seems like it would still be better than cross loading the
>biners). Am I missing something?
- - No.
> Does the fact that the accessory cord
>and the sewn slings are different sizes/shapes make any difference?
- - A little but not enough to matter, as long as the knot is snug
and there isn't the potential for sliding.
- - For a toprope anchor this wouldn't bother me at all. I'd prefer
it in almost all cases to loading a 'biner over an edge. Knots are
knots, they all weaken the material they're tied in. I don't
quite understand why the fact that girth hitched slings are weaker
is such a surpise to people. A girth hitch is just a square knot
with most of the bend in one rope, under force they almost always
turn into a square knot. If you look in the tables you'll find
that a square knot is one of the weaker knots due it it's sharp
- - I think it's good to know that girth-hitching creates a weaker
link, but that doesn't mean you should throw it out of your
tool box of techniques. Sometimes weaker is still good enough,
(and sometimes it isn't...)
- - Unfortunately, climerware is still off-line, but if you look at
the data you see that a girth-hitched sling is still much
stronger than the open gate strength of many 'biners. ( 14kn
vs. 9kn ). I'd be much more worried about loading a biner over
an edge, biners aren't rated or tested for that kind of loading.
You have no idea of how much force it will withstand, at least
with the sling you have a good guess.
- - Booker C. Bense
- Provided it's not a sharp edge.
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