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treyfrancisclimbs
Jul 25, 2006, 6:28 PM
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Registered: May 30, 2004
Posts: 170
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Just a bit curious about whether or not anyone has broken a slackline while tightening it, and if so, what kind of set up did you have? I don't really think we were close to doing so, but we tried to set up a 50 foot line yesterday over a river and even after 3 of us locking down pretty tight on it we were still getting about 2 feet of sag. I guess I am wondering if it is safe to try to pull a 50 foot line super tight to reduce the sag to little or none at all, or if that will get us close to the breaking point of the line.
I'll take my answer off the air.
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slacklinejoe
Jul 26, 2006, 1:43 PM
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Registered: Nov 5, 2003
Posts: 1423
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I've broken a few lines while testing stuff - not plesant. But never during tensioning and never on a full strength line that wasn't using horribly abused webbing. I'm sure there are several other folks on here that have broken lines too.
Despite what it feels like, during the tensioning of a line the forces usually aren't that high (or at least not for anything under 100 feet or so). It's when weight is in the middle of the line that the forces jump up.
For calculating how much of a load the system sees while your on it, you might find my Slackline Force Calc handy.
My generalization is expect six inches to a foot of drop for every 10 feet between your anchors.
Also, since you mentioned over a river I figure it's worth mentioning wet webbing stretches like crazy. You have to tighten that stuff up an amazing amount.
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