New soft shackle strength question

[allene]

Originally Posted by Brion Toss

Hi again,
Another lovely variation, and it might hold promise. But the issue in this case is not strength, but security. The reason for the long bury is that HM fibers are very slick (most knots crawl out of them), so it takes a long bury to generate ultimate friction. I have pulled apart short-buried splices at relatively low loads, in tests, and have heard of them failing in the field.
The Diamond Knot-based soft shackle is weak only relatively; it is still far stronger than a comparably heavy/expensive stainless shackle, as well as being soft. Toggled versions of the soft shackle exist, and they are fast and strong...
Fair leads,
Brion Toss

I did some pull testing of some 5/32 versions. My only calibration is that I cranked on the winch as hard as I could (35 power winch) and that stretched the 7/16 connecting yacht braid 10%. Nothing slipped but the diamond knot version did experience a fair amount of deformation on the underside of the knot, as one would expect. I noticed that the loop tended to compress itself because of the way it is looped around the eye splices. I am sure that gives additional friction to the splice area compared to just pulling on a splice.

Here is an interesting question. If the length of the bury is fixed, would a larger line be stronger or a smaller line. You get more diameters with a smaller line but it is inherently weaker and the larger line gives more surface area in the splice even thought the length is the same. Thinking about that makes my brain hurt.

Allen