Replaced my CB cable with a dyneema line. It has a spliced eye with thimble for connecting to board with a shackle. The line has worked without any issues except the tail of the splice is so long that it jambs in the turning block in the bilge
and leaves the board peeking out a couple of inches below the keel
. A knot
would have allowed the board to fully retract. Will try that the next time the boat is hauled but stitch the knot so it can't untie itself and see if an inch or two can be gained eliminating the shackle and fastening the line directly to the board.
If I understand the problem with these high strength lines is they are slippery but not so slippery that a knot won't hold. The problem with knots in the line, other than it reduces the strength of the line, but cyclic loads. When tension is put on the knot and then relaxed , the knot loosens with each cycle. When tension is applied again the knot slips a little until eventually the tail pulls through. Can live with the loss of strength as the line is grossly over strength for the load but have a fond desire not to have it untie itself and leave the board hanging. Stitching the knot should prevent that.
Quit using a bowline on my lines and have gone to a Buntline hitch. Supposedly works better on these high tech synthetics. Also understand there is another knot that is more compatible with these lines. Perhaps someone else know what that is. Haven't had any problems with the buntline hitch holding on dacron jacketed dyneema lines. Don't use shackles on any of my halyards or sheets
and haven't had any problems including the run to Hawaii