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I have started to use 9 mm mountian climbing rope for the snubber.
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A Dynamic not a Static I hope. A Static is only allowed to have 10% at break so piles less than a yachting rope. Dynamic do and are indeed designed to stretch more than Static but even then bugger all more, if at all, than some ropes used by
boats. But climbing ropes lose their stretch relatively quickly compared to average boat ropes. A couple of things to keep in mind.
The best ropes to use are nylons and multiplaits like a 8 or 12 strand. One size down from what you would use as a anchor warp. This is so they do stretch well. Too big and they just won't.
Double braids? Sure but why bother when a 3 strand is cheaper and quicker to put together well. If you want to you a double braid make sure it's a nylon rather than a polyester, it'll just
work better.
Polyprop or Polyethylene ropes? No way, silly idea. These will melt under the cyclic loading snubbers do. What's more they will melt from the inside out so you'll never see it coming until it's all over.
Length? longer is better than shorter, more rope to stretch.
Snubber ropes are a consumable item. If you make them to last for a gazillion years you are making one that won't do it's job for long.
Ropes work harden so if you work your snubber hard it will only stretch less.
Hard to beat a bog standard bit of 3 strand really. Grab a std grab hook off the shelf, a short of rope from the specials bin, a cold
beer and you have the makings of a good basic which will work well snubber. Easy peasy and all done in a few minutes.
DON'T FORGET - most ropes on
boats fail due to chafe. Do whatever you have to to minimise that.