New to Dyneema, want to make lifelines - SailNet Community
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post #1 of 39 Old 05-17-2017 Thread Starter
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New to Dyneema, want to make lifelines

So I'm adding stern rails on my little boat and will be re-doing the lifelines.

I think I'd like to do the lifelines in dyneema. It looks like it should be fairly simple. For the gate end get a pelican hook that has an eye instead of a wire swage. For the other end just tie it to the pulpit with lashings.

Per side/gate I'd need a pelican hook, a length of lifeline dyneema, and a short length of smaller dyneema for the lashing. Does that sound right?

What sort of dyneema is good for lifelines, and how do you splice it?

What should I order for the smaller dyneema?

I've never worked with dyneema before and I'm pretty new to splicing. I do have a fid, but it may be too big for dyneema.

Thanks in advance!

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post #2 of 39 Old 05-17-2017
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Re: New to Dyneema, want to make lifelines

See: http://www.ussailing.org/wp-content/...May%202013.pdf
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Re: New to Dyneema, want to make lifelines

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Originally Posted by Plumbean View Post
Awesome, thanks!


I'm thinking about going with Samson's Control DPX. I use it for my halyards so I'm familiar with it. It's pretty easy on the hands and you can tie regular knots in it. 1/4" line has 3800 lbs breaking strength, so even if I cut that in half by tying a knot it would still be stronger than my stanchions.

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post #4 of 39 Old 05-17-2017
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Re: New to Dyneema, want to make lifelines

Most all the ropes have enough strength.
UV and chafe resistance are my biggies.
I think it's also good when you can cut a lifeline/any line with a pocket knife.
Somebody could market thin, zero-chafe stanchion inserts....
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Re: New to Dyneema, want to make lifelines

I used tubing that fit over the Dyneema and inside the stanchion tubes to reduce chafe. Seems to work pretty well but it's super snug. You can make the tubing a little more malleable by heating it up a bit in hot water. I don't think that affects the Dyneema strength, but you should check. I also used the modified Brummel splice videos from Colligo Marine (Tech. Videos ? Colligo Marine®).
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Re: New to Dyneema, want to make lifelines

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....modified Brummel splice videos from Colligo Marine (Tech. Videos ? Colligo Marine®).
That's a good video - better than others I've seen.
Single braid is a piece of cake, imo.
Thanks.
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post #7 of 39 Old 05-17-2017
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Re: New to Dyneema, want to make lifelines

Quote:
Originally Posted by Minnesail View Post
Awesome, thanks!


I'm thinking about going with Samson's Control DPX. I use it for my halyards so I'm familiar with it. It's pretty easy on the hands and you can tie regular knots in it. 1/4" line has 3800 lbs breaking strength, so even if I cut that in half by tying a knot it would still be stronger than my stanchions.
Note that Control DPX is a blend with polyester and has about 1/3 the strength of 100% dyneema line of the same diameter. I would use the real stuff and go with a simple bury splice rather than knots.

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post #8 of 39 Old 05-17-2017
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Re: New to Dyneema, want to make lifelines

I made dyneema lifelines for a friends J-29 last year and spliced (simple, easy even for me) one end and lashed the other so he could go end for end when started to chafe at stanchions.
I used 5/32" dyneema rated @ approx. 4,000 lbs.
Wanted to coat with Yale Maxi jacket coating for chafe protection thru stanchions but were installed before I could coat.
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post #9 of 39 Old 05-18-2017
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Re: New to Dyneema, want to make lifelines

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That's a good video - better than others I've seen.
Single braid is a piece of cake, imo.
Thanks.
You're welcome! I could not figure out the written instructions, but these videos (where I could stop at each step) were perfect. They generally took me about 15 min to do, though with practice, it would easily be faster than that.
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post #10 of 39 Old 05-18-2017
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Re: New to Dyneema, want to make lifelines

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Originally Posted by JimsCAL View Post
Note that Control DPX is a blend with polyester and has about 1/3 the strength of 100% dyneema line of the same diameter. I would use the real stuff and go with a simple bury splice rather than knots.
This is what I did. Simple bury splice on both ends (one with a pelican hook and the other with thimble), lock stitched. Using the plain dyneema I upsized to 6 mm so stronger than the stainless steel it replaced. I used the stuff from CS Johnson for the pelican hook. My stanchions were new and smooth, so not concerned about chafe protection.
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