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Old 19-02-2013, 18:28   #1
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Spliceing two different lines

Line 1 is 3/16" dyneema 12 strand braid. Line 2 is 1/2" double braided polyester.
What is the best way to splice them? Extra requirement - the splice has to go through a block.
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Old 19-02-2013, 18:45   #2
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Re: Spliceing two different lines

If it is a small block then splice the shortened core onto the dyneema, milk the sleeve forward and splice it onto the dyneema. Viz cored polyester onto wire.

That's my guess, not a hard fact.

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Old 19-02-2013, 18:59   #3
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Re: Spliceing two different lines

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Originally Posted by barnakiel View Post
If it is a small block then splice the shortened core onto the dyneema, milk the sleeve forward and splice it onto the dyneema. Viz cored polyester onto wire.

That's my guess, not a hard fact.

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The block can take 5/8" line.
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Old 19-02-2013, 19:14   #4
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Re: Spliceing two different lines

You could do it with a locked brummel splice. Please note that I'm not recommending this since I don't know the application or loads.
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Old 19-02-2013, 19:26   #5
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Re: Spliceing two different lines

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You could do it with a locked brummel splice. Please note that I'm not recommending this since I don't know the application or loads.
I was thinking about brummel splice. Do you think I should splice the core of the polyester line with dynema and then pull the cover over the splice?
This is a genoa reefing line. I have to increase the diameter to use a rope clutch but only the portion outside of the drum.
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Old 19-02-2013, 19:35   #6
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Re: Spliceing two different lines

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Originally Posted by Tristan View Post
This is a genoa reefing line. I have to increase the diameter to use a rope clutch but only the portion outside of the drum.
Cool. I was worried that you might be doing a halyard.

Check these instructions: http://www.neropes.com/Splicing%20Gu...d_Brummell.pdf
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Old 19-02-2013, 20:03   #7
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Re: Spliceing two different lines

The best instructions I have for this is from the L-36 site. At Splicing Amsteel to Sta-Set

However if all you want to do is thicken the line for a clutch you can use a tapered bury splice at either end of a short piece of cover to thicken the line just where it hits the clutch.
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Old 20-02-2013, 06:10   #8
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Re: Spliceing two different lines

Alas, for a furling line on a drum:

One can buy a length of cored line (can be spectra sheeted in poly (which is less expensive)). I use poly on poly.

AND remove the sleeve/jacket from the drum part of the line then splice the remaining jacket onto the core somewhere out of the drum going part.

In this way you get: bigger dia for the clutch, smaller dia for the drum, no splices. Max convenience, I think.

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Old 20-02-2013, 10:14   #9
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Re: Spliceing two different lines

3/16" core will not work in 1/2" line. You'll need a transition splice between the two. The problem is when you try to bury the larger line into the smaller line. You can only do that if it's 1 or 2 sizes different in diameter. And that's only sometimes.

The L36 site is good, but the cores are almost identical in size, which makes splicing it really easy.
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Old 20-02-2013, 10:17   #10
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Re: Spliceing two different lines

Merit,

Good catch, I missed that. But the answer is pretty easy, you just have to taper it twice. So the thin amsteel core gets end for end spliced onto a larger section of amsteel. Then that is spliced onto the sta-set.

Frankly I don't line making lines like this since it creates a number of failure points, and I start looking for ways to use a continuious dyneema run with bulking/covers. But then I won't buy polyester line anymore. It's more expensive than dyneema line when sized properly, and has a number of other qualities I object to.
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Old 20-02-2013, 10:25   #11
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Re: Spliceing two different lines

I agree with you, poly line should only be used in cheap dinghy line, even then there are better single braids out there than poly.

For a furler, you need compact storage at the drum and good hand for the clutch/cleat. Flightline works well, among a lot of others.
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Old 20-02-2013, 10:56   #12
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Re: Spliceing two different lines

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Originally Posted by Merit 25 View Post
I agree with you, poly line should only be used in cheap dinghy line, even then there are better single braids out there than poly.

For a furler, you need compact storage at the drum and good hand for the clutch/cleat. Flightline works well, among a lot of others.
I assume when you use word poly you mean - polypropylene . In my post I talked about polyester - completely different property.
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Old 20-02-2013, 11:01   #13
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Re: Spliceing two different lines

No I mean Polyester, sorry for the confusion. There really aren't a lot of good uses for polyester on a sailboat. They're making much better rope these days.
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Old 20-02-2013, 11:16   #14
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Re: Spliceing two different lines

As far as I know STA-SET is all polyester an even the high tech lines are still using polyester cover (if they use cover). Polyester line is the most common line for running rigging. It is slowly replaced by HMPE lines like Dyneema or Vectran but that a long way to go.
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Old 20-02-2013, 11:22   #15
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Re: Spliceing two different lines

I meant for cores. Polyester core and cover. Yes, I'm fully aware they make most cover from polyester and that sta-set is very common (I'm a New England Ropes dealer). But that's b/c it's a good line built to a price point. Performance wise, there are better choices. Blended covers, and Vectran, dyneema, etc. cores, but your average sailor thinks sta-set is expensive, so that rules out the better performing cordage.

To bridge the gap between the two NER and Samson have come out with blended cores that are cheaper than the all out racer lines. VPC and MLX respectively. Both of these lines are a great upgrade w/o breaking the bank.
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