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here's pic to clarify double fisherman is one of best termination knots available. add one more loop, it becomes triple fisherman knot. possibly most secure bent known. pictured top to bottom: 1. beer knot 2. triple fisherman termination knot on biner. note wrap keeps ends neat only. 3. double fisherman knot as backup knot for a figure eight.
Double Overhand, Double Noose, Scaffold, Fishermans etc. knot tests Full/Full strength is great; but if any other bends/ compromises in lines/cords then shouldn't sweat tooo much making this link stronger than rest of the chain of support in that line. Thus, IMLHO the main facture is the security and not so much strength added by triple.
Using an 8 or fisherman’s is going to eat time when you need to untie. FWIW, Figure 8 is the strongest common knot. It has no severe bends or areas of force concentration. Bowline, Reverse Overhand Followthrough are notably more prone to failure. But I’ve negative rigged thousands of pounds onto a running bowline and never had a knot break.
What arbos call a double fisherman's knot/hitch might go by other names in other rope disciplines. After looking at many knot books and many knot/rope disciplines, it seems [to me] that the most common use for the double fisherman's knot/hitch refers to the part of the rope configuration that makes "crossing round turns with a tuck".
With a Double fisherman's Knot on Both ends of the cord,the ring is usable Pulley is far better, Early on with this setup we used the Key Chain Biners it don't hold any load it just tends the rope. I like the Double Fishermans knot better than a Splice because it will fit clost to the Carabiner with out the double rope( rope inside of rope) as ...
You make a loop in a rope with a double fisherman's knot or in webbing by sewing the ends together. The original strength of the rope or webbing is 25kN. If the double fisherman's knot or stitching do not cause any weak spots in the material, will the loops have a strength of 25kN or will it be more?
A fisherman's knot is just a two turn overhand, some call the three turn overhand a "scaffold" hitch; which I have adopted. Two turns is a fishermans, three tuns is a scaffold. They both fall into the snare noose category.
The double fisherman's were clearly way too tight to untie--I ended up cutting them off. To my surprise, the bowline untied easily! It had 2392 lbs. tension on it when the butterfly broke, and even though it had been visibly stressed, I didn't see anything that looked like actual damage.
I just put a new piece of climbing line on my cougar as the rope bridge, used the ol' double fisherman's knot. Leave a good 1 1/4" of tail past the knot, then sit in it a few times to set everything nice a tight. Tape the tails and trim to desired length, singe the ends with a propane torch, just watch the center part of the bridge...
Double fisherman's used to be the go to knot for rescue climbers. Used in prusiks, belay lines, etc. I say used to because I dropped my certification years ago and do not know what is popular now. Double fisherman's only reduces rope strength by ~25%. When done correctly it is as safe as any.