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Go Back   SailNet Community > Skills and Seamanship > Seamanship & Navigation
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Seamanship & Navigation Forum devoted to seamanship and navigation topics, including paper and electronic charting tools.


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  #41  
Old 04-17-2009
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Most failures would be just abrasion of the core loop around the shackle. If the shackle is suffering rust / corrosion etc - then it makes sense the weakest link is the weakest point that has the less amount of material (around the shackle). Arguments about the knot being the weakest link are only valid if the knot is one that easily becomes undone...
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Old 04-17-2009
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Yes, the failure is inside the knot, and always in the same spot.

Quote:
Originally Posted by lancelot9898 View Post
It was my understanding that the failure was at the U bend and not at the knot itself. If that's the case then it doesn't matter as to the type of knot or splice being used. I always thought the failure would in fact be at the knot since most books mention various reduction in strength for various knots and how a splice is better.
I highly recommend, for anyone interested in knots, that they take some light line (less than 1/8"), tie opposing anchors in pairs, and start breaking them.

Note that differing line materials matter. Don't use cotton or binders twine - different rules apply because of differences in friction.

I used to make and market rock climbing equipment, and we spent many hours breaking stuff. Always educational.
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  #43  
Old 04-17-2009
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Quote:
Originally Posted by pdqaltair View Post
I highly recommend, for anyone interested in knots, that they take some light line (less than 1/8"), tie opposing anchors in pairs, and start breaking them.
.

I was considering taking a small diameter 3 strand line and comparring the back splice around that last chain length vs an eye splice without the metal thimble to determine which is better, however with the small diameter line I also need a small diameter chain length to get an accurate comparison. The weakest link will be the chain so to prevent chain breakage a larger diameter chain has to be used. If I run out of boat projects I'll get two short links of 3/8 chain and tie one chain using 3/16 3 strand nylon(1200 pound breaking)with the back splice and the other chain with the eye splice. The next step will be to pull the two chains apart and see which end breaks. A strain gage would be nice to see how close to the 1200 pounds is achieved.

Last edited by lancelot9898; 04-18-2009 at 12:03 PM.
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