CHAFFING is the main concern for a rope, on the seabottom (use some chain) at the level of the splice and also at the cleat or Samson post...
Yes, chafe is a concern. But, with regular inspection, it isn't a serious issue.
I can’t see how (or why?) the fact to separate the three strands or splicing the whole rope will change something; the radius is still the diameter of the chain link... (at least for the inner fibers, and not that much bigger for the external ones..)
If you think about the rope as individual strands of fiber, when you bundle them together in a thick bundle, the ones on the outside of a tight radius bend are under a lot more tension than the ones on the inside of the bend, due to the fact that they have to go a further distance. By separating the rope in to three laid strands, the fibers are now being stressed more evenly than they are when you do an EYESPLICE with the entire rope. By spreading the tension on the fibers more evenly, they're far less likely to break.
This is why, my favorite is the elongated splice described in BlueMoment - Articles
This splice will also go easily through the deck pipe and the windlass...
From what I've seen, very few windlass manufacturers recommend this type of splice. IMHO, it probably causes more chafe on the line IMHO as the chain and rope move against each other. The single point of contact between the rope and chain on a properly done backsplice is generally tight enough that movement is almost non-existent, which limits the amount of chafe possible there.
Also, the elongated splices are going to collect more mud or sand and the galvanizing on the chain is going to wear faster because of that. The backsplice is generally tight enough that not a lot of mud or sand will get in, and because it is fairly limited in its movement, it won't wear the galvanization as much.
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