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ml_nelson
Apr 15, 2010, 3:55 AM
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Registered: Apr 12, 2010
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Does anyone recognize this knot? It's my attempt to utilise fisheman's knots to make a loop on the end of static line that does not have the strength degredation associated with the ususal knots.
Does this have a name? Any idea if it's been tested for breaking strength? Any fatal flaws?
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jbro_135
Apr 15, 2010, 4:03 AM
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If I'm not mistaken that is the "overhand on a bight with a half a double-fishermans keeper knot," brilliant good sir
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mattsheat
Apr 15, 2010, 4:12 AM
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What 'usual' knots are you referring to?
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bhp
Apr 15, 2010, 4:13 AM
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It's clearly not just that; the "overhand" part is a slipknot, and has an extra turn over a "normal" overhand slipknot. Looks like it might work, but even if it does, I'm not sure that it would be significantly stronger than say a figure eight on a bight, or that it should really be considered necessary. Ropes in even semi-reasonable condition don't just break, although they can be cut over sharp edges. This is not to discourage experimentation, and if it proves to be way stronger, I may just use it.
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ml_nelson
Apr 15, 2010, 5:18 AM
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Picture it as a single fisherman (like a stopper) tied with a real long tail. That tail is then feed back up through the knot & a traditional Fisherman tied around the main rope.
The part that is odd is that the "tail" from the 1st fisherman carries load, where in most usage, the tail just hangs free.
It's nice in that its compact, neat & likely strong. My own fear is that, like the typical double-fisherman we tie in Prusik's, this will weld tight under load never to be untied.
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bhp
Apr 15, 2010, 5:42 AM
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Registered: Jan 28, 2010
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I noticed that the way you have it tied in your picture has the 'coils' of the stopper knots tied with opposite orientations, or twists. Changing the lay of one of the stoppers results in a much cleaner knot.
Data here seems to indicate that the double fischermans doesn't fare much better than the fig. eight on a bight in terms of knot efficiency, although I suppose it's somewhat apples to oranges as one is a bend and the other a loop, but I don't see any particular reason why this should be any stronger than the fig. eight.
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0415000124.jpg
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ml_nelson
Apr 16, 2010, 10:49 PM
Post #7 of 8
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I did some crude pull-testing & it does not look very good for this knot.
Here is what I did; I tied a loop of my knot in one end of a cord and a Figure-8-on-a-bite in the other end. My logic is a Figure-8-on-a-bite is the benchmark, lets see who breaks first.
What I found is that a pull-to-failure always results in a failure at my knot, never at the Figure-8. Furthermore, a lot or rope pulls through my knot before it fails, about 5x more than what pulls through a Figure 8.
Bottom line.... My knot is more complex that a Figure 8 and it breaks more easily. Its a looser.
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bhp
Apr 17, 2010, 12:30 AM
Post #8 of 8
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Registered: Jan 28, 2010
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Well, it was worth a shot. Thanks for doing the research.
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