prussiks slipping on tarp ridgeline
My tarp ridgeline is 1.75mm Lash-It. I had trouble keeping the tarp taut along the ridgeline in some wind -- the prussiks slipped.
My prussicks are mason line, 3 wraps. I've also tried a Klemheist with 3 wraps. It was marginally better. The issue seems to be with the low-friction Lash-It. I know that ideally the loop used to make the prussik should be a smaller diameter that the line it is used on, but I don't have much anything on hand smaller than the Lash-It to experiment with. Any ideas on non-slip adjustability?
I thought about coating the prussiks with a thinned silicone seam sealer to increase friction, but haven't tried it yet.
What are other folks using successfully?
Tinkering in the back yard
I got a chunk of zing-it as a stocking stuffer so I had to try it out over the weekend in a variety of configurations for my new tarp ridgeline.
I tried using the mason line with both a 4 wrap prusik and klemheist and both slipped quite a bit. "Roughing up" the line helped a bit but I'm kind of leery of chewing up the ridgeline too much.
Next I robbed some of the twisted nylon strands from the center of some 550 cord scraps. These are really small cord but surprisingly strong. These held better than the mason's line but I was worried about the small cord and abrasion problems.
Lastly I found some scraps of unknown line in the bottom of my gear pile. It was some poly/nylon braided guy line I bought a few years ago. It's a very tight braid but the outside was pretty coarse. I tried using it as drawstring but the cord seemed to "grab" even on silnylon. The diameter is about half that of my 2.2mm zing-it. With the same knots this held much better than the two previous lines. I believe the texture had more to do with it than anything.
So it seems the "hand" of the cord, the diameter, and the texture of the shell all effect friction knots. It's amazing what you learn here on HF.