Attaching a snap shackle to a spliced eye

D

dmonn

Branched out member
Location
Port Washington Wisconsin
This is a sailboat concern--not a tree thing. My skipper wants to put a snap shackle on some 3/8 double braid line. The hasp(?) has about 1/8" diameter. That seems like the opposite ratio for the recommended bend radius of rope. Could this be mitigated by using multiple wraps of 7/64" AmSteel to connect the two? I'm contemplating doing that by making a long loop soft shackle so it's removable. I think a two or three wrap soft shackle should well exceed the strength of the 3/8" polyester halyard. Opinions? The photo is just a prototype--not the actual snap shackle. PXL_20250406_135817209.jpg
 
Best way I know of is to use a plastic thimble inside the knot/splice
 

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Id Resplice cause multiple connections multiply failure points- add a thimble to the new one or do an integrated soft shackle spice
 
New England Ropes and Robline’s make a version of 3mm dyneema with a break strength of a little over 5000 lbs. that could be inserted in the end of the the rope, with a separate eye cover, or using the double braid’s.
IMG_7111.jpeg
I tried it once with RING, shown above, but removed it and did a double braid splice with the two cores.
 
If you cut the eye off, may consider making the new eye large enough to girth hitch the shackle so its an easy swap in the future.
 
STS-HSR dyneema 5000 lb 1/8" appears to be right on double 2500 lbs 1/8" amsteel !! That's quite a breakthrough. Anything published on whether it translates to equally higher knot strength and load-cycles fatigue life? What about shock loading? Seems possibly free lunch going on - or not? Also are just the yarn bundles treated or is the whole assembled braid heat treated?

doh. 2015 I'm 10 years behind this tech
 
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Ragnar said:
If you cut the eye off, may consider making the new eye large enough to girth hitch the shackle so its an easy swap in the future.
Click to expand...
Redoing the eye splice would have been my first choice (with a girth hitch to the shackle). The problem is the line is unbelievably stiff. One year of use on it and it feels like a 10 year old line. I think we pushed the load limit on it last year! The use on it this year will be different--we'll use it only for lighter winds (we blew up the sail last year in a storm). I've spliced old used line a few times, and it ain't fun!
 
It appears the fibers are coated while being formed into strands, they stick together when trying to separate the strands. There is very little twist in the strands, the NER is 3mm, the Ocean is a little bigger, closer to a 4 mm.
 
A little more reading and the line dia shrinks during the heat treat resulting in higher strength from the "same dia" smaller line and has more weight per foot than normal line. Bunch of brands on the market for the sailing guys. Also grade of dyneema could be 20% strength difference.

I've noticed cabling up of polyester double braid after just a few hundred lbs load vs loose flaked.
 
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