New shrouds, looking recommendations

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Ülari
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New shrouds, looking recommendations

Post by Ülari » Sat Mar 07, 2020 18:35 pm

Hi,

Since one of my upper shroud has scratch and needs to be replaced, I am considering going for Dyform. Idea is to replace all 4 shrouds. And now I am looking for a Finnish company that can do it if I send them measurements. I think it would be a simpler solution than finding a way to get it done in Estonia, since places that do terminal pressing does not sell Selden parts.
I was hoping someone here can point me to right direction.
Also pros and cons of Dyform vs standard wire?
s / y Lagle III (EST-554)

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Re: New shrouds, looking recommendations

Post by Cage » Mon Mar 09, 2020 20:39 pm

If you're just replacing the shrouds, then any shop capable of the job is fine. At least in our boat the shrouds have terminals with holes in them and they are fastened with rig bolts both in the mast end and in the turnbuckles. I think our shrouds have terminals made by Bluewave (not sure, though).

I also recommend replacing the fastenings (or whatever they are called) in the mast where the shrouds are attached. From what I've heard, breaking one of those fastenings is a common reason for rig failure.

We bought our shrouds from https://rig-man.fi/en/.
Last edited by Cage on Tue Mar 10, 2020 19:19 pm, edited 1 time in total.
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harald
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Re: New shrouds, looking recommendations

Post by harald » Tue Mar 10, 2020 12:12 pm

Dyform is regular wired rolled between rollers so the parts are triangular in section. This makes the Dyform wire a little stiffer per area. Most OD-rules don't allow rod, Dyform is the stiffest available wire.

We renewed our wires with Dyform in 2006. Baltic Rigging did them for 190 €. But I think that firm doesn't exist anymore.
Image

This has been discussed here: viewtopic.php?t=1889 It might be a good idea to check the rake of the mast when ordering new shrouds.

Discussion about rake and renewing of shrouds here: viewtopic.php?t=727 and here: viewtopic.php?p=12615
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Re: New shrouds, looking recommendations

Post by Panu » Wed Mar 11, 2020 11:24 am

harald wrote:
Tue Mar 10, 2020 12:12 pm
Dyform is regular wired rolled between rollers so the parts are triangular in section. This makes the Dyform wire a little stiffer per area. Most OD-rules don't allow rod, Dyform is the stiffest available wire.
Hi there

In general you can affect the strenght of material by 3 ways:
  • Changing material's chemical composition
  • Heat treatment
  • Cold forming
Dyform uses Cold forming in addition to ( as a "side affect") reducing air gaps between each wire threads. This has direct affect on wire's density (mass / lenght, kg/m) and strength because roll forming makes wire more "solid" and harder.
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Re: New shrouds, looking recommendations

Post by Ülari » Thu Mar 12, 2020 22:08 pm

Cage, I have hole terminal in turnbuckle end and T-terminal in upper end. Replacing the T-terminal mast backing plate is good advice, didnt even think about it myself, but now seems very logical.

While I know about the benefits of dyform, I am more interested if FENE hull is stiff enough to make the difference. But I think I will get some price quotes first, because if difference is minimal, this should not be even a question.

Harald, looking at picture. Your new shroud T-terminals does not look like original. I have read from Selden manual that T-terminals must match their backing plates. Did you replace them also?
s / y Lagle III (EST-554)

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Re: New shrouds, looking recommendations

Post by Cage » Thu Mar 12, 2020 23:52 pm

Ah, true, I was completely focused on the forestay. The main and lower shrouds of course have the T-terminals in the mast end.

I ordered the same guy that did our new shrouds (incl. forestay) to change the backing plates. Our new backing plates have bigger holes than our previous ones, which doesn't matter in normal use, except that when raising or lowering the mast the lower shourds have a tendency to fall out.
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Re: New shrouds, looking recommendations

Post by harald » Fri Mar 13, 2020 14:08 pm

As far as I can remember the T-terminals where exactly the same as the old ones. I didn't even think about changing the plates back then. That day will probably come.
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