Today’s post includes a video below.
Expanding on my thoughts about the “double-bight” line locker, I have modified the method I use to attach the fixed-end of my Slackline to a tree. Thinking about how this works, I was able to eliminate the water knot and replace it with a double-bight line locker
This method has one advantage, and one disadvantage as compared to using a traditional water-knotted anchor.
Advantage: there is no knot in the line. In general, knots tend to weaken the anchor. I am not sure how much, and I know the weakness is reduced if you use a third strand of webbing to beef up the knot. (See here)
Disadvantage: There is only one level of webbing going around the tree. With a traditional water-knotted anchor, the anchor is doubled around the tree. This puts less stress on the anchor itself. However, for shorter lines (< 100 ft), I am not sure how much of an issue this is. Here is a photo of a fixed anchor some guys made (red line) to secure a 70′ Slackline. It uses only one wrap around the tree (similar to my method) but uses a knot (which my method eliminates).
I consider this an extension to my series on Anchors.