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Chockstone Forum - General Discussion

General Climbing Discussion

Topic Date User
More slackline anchors 25-Mar-2013 At 10:56:34 PM Dr Nick
>Too tired to work out resultant vectors at this time of night.

Assuming a 30m horizontal slackline and 2m of drop in the middle, 80kg person in the middle. Downward force is 800N (I'm too lazy to use 9.8 tonight). It's been too long since I've been down to Arapiles to picture the distances involved, but I have a feeling we're talking some decent gaps. In any case, the angles seem to be about what I've seen in slacklines - they're not *that* slack.

Load angle is about 8 degrees below horizontal. That comes to about 3kN (300kg equivalent) on the anchors. If you drop it to 1m of slack then it's about 6kN on each anchor, and 0.5m gives 12kN. Shorter lines for the same slack give lower loads.

Note that these are the generated loads, and are going to be static. There's no safety factor, and nothing taken into account for bounce loads. If you take a reasonably conservative 4 fold multiplier for those, you're getting up to the breaking strain of a lot of natural gear even for the best case scenario.

I suppose if you had a belayer on each side with enough slack that you weren't going to generate huge loads you could test things, but I can see the attraction in multiple BFO bolts, particularly if the slack line is going to be your safety line as well.

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