dynex dux eye splice

[asdf777]

I'm new to the forum and apologize if this has already been discussed. My 30' boat is in Tahiti and I'm in California for a couple of months. I'd like to bring back some spare rigging in case the existing fails and be able to replace it by myself, maybe in the ocean, if necessary.

A couple of weeks ago I started searching and found out about dynex dux. It seems like a good solution on paper, but line terminators are thicker than the shroud tang opening.

Does anybody see a problem with dynex dux made with an eye splice on a clevis pin and a turnbuckle/shroud tang instead of line terminators?

Here are a couple of pictures of the existing rigging on the boat:

http://www.sailblogs.com/sbgallery/p...w/sb95ffx7.jpg

http://www.sailblogs.com/sbgallery/p...w/sbsuuwjc.jpg

http://www.sailblogs.com/sbgallery/p...w/sb5vi2p1.jpg

The wire is 316 7/32" 1x19 on lower and upper shrouds, and 1/4" ss 1x 19 on forestay and backstay.

What kind of dynex dux rope would you recommend for a replacement and/or emergency?

Also, there have been pictures of dynex dux rigging from this site that showed ss thimbles on a clevis pin. Is this a better option than an eye splice? Why or why not?

http://i278.photobucket.com/albums/k...ngriggin-1.jpg

Many thanks!
Gleb

[Stumble]

Asdf,

There are a couple of ways to answer your questions depending on the goal of the Dux shrouds. If it is just an emergency/get home set up then I would double the strength of the largest wire on the boat, eye splice it onto a thimble with a turnbuckle and call it done. Quick, dirty, but it will work, and work well. If you are thinking of switching to fiber rigging then you need to do more work, and probably just call John Franta at Colligio to design the system for you.

As for type, Dux is a name brand and is exacally the right line to use. There is another option (but I can't remember the name). It is the same heat treated dyneema as Dux but from a different manufacturer.

I don't like the eye splice onto a thimble as a permanent solution since the entire load has to be carried by the very small contact interface between the thimble and the clevis pin. I actually have this on my trimaran, and it works, but I would much prefer a terminator. The larger bearing surface is a better option.

[asdf777]

Thank you! Yes, I wrote to Colligo Marine a couple of emails, but no responses so far. Maybe I should try calling.

I'm thinking of both - emergency shroud and switching to synthetic rigging eventually. I like the fact that it seems possible to replace it all by yourself.

So the reason an eye splice on a pin is not as good is because of a small contact area?
The rope should hold anyway, no? The strength rating of 7mm is 15.5K lbs vs 5000-6000 lbs of existing 1/4" 316 1x19 wire. The rig tension would be less than 2000 lbs on this wire.

In fact, I was thinking that tying a double bowline knot may be enough. Even if the rope loses 50% of the strength, it still should be plenty for the boat size. Am I wrong?

The line terminators are beautiful, though.


Thank you!
Gleb

[Stumble]

To be clear. The problem with an eye splice directly to the pin is the lack of sufficient bending radious the pin provides. There needs to be a larger eye here. The option is a thimble or a terminator. The problem I have with using a thimble is the low contact area between the thimble and the pin, which leaves a terminator as the prefered way to handle this.

Knots are never acceptable for dyneema, and Dux is even worse. Because it is so slippery it has very poor knot holding characteristics. Particularly in standing rigging the only acceptable method is splicing.

As I mentioned I don't like the thimble-pin connection. But I am currently using it on my trimaran. I consider it poor practice, but acceptable for a day sailor where I can regularly inspect the thimble for wear and deformation. For a cruiser I wouldn't consider it acceptable.

[asdf777]

Yes, it all makes sense. Great explanation - thank you very much!

There are 3/8" thread studs with 5/8" jaw that will accept a line terminator, but for the double tang, it doesn't look like there is space for 2 thimbles... What would you suggest instead?

Many thanks!
Gleb

[Stumble]

If in doubt call John at Colligio. I am suprized he has been difficult to contact as he is normally very good about getting back to people, but either him or Brion would be my go to for any rigging questions.

[Brion Toss]

Hi at last,
I've been a little slow getting back to people, but am now home after a delirious 3 weeks or so in Australia. I like Colligo's thimbles, especially as they allow an option for attaching lanyards. But the massive radius isn't actually a requirement for Spectra, so consider one of P.T. Foundry's wide-radius solid bronze thimbles. Beautiful things, and not too heavy, and much, much stronger than open thimbles.
Fair leads,
Brion Toss

[Stumble]

Brion,

Do you have a source? I looked but couldn't even find a whif of where to find them.

[asdf777]

Thank you both! It must be this:

http://www.porttownsendfoundry.com/rigging.htm