Is triradial cut adequate for a dacron roller furling genoa? - SailNet Community
 
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post #1 of 8 Old 11-09-2012 Thread Starter
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Is triradial cut adequate for a dacron roller furling genoa?

Hola!
You can frequently read that some sail lofts dont recommend triradial cut for dacron sails.
Others do.
All agree that laminated sailcloth is the right chyoice for triradial cuts.
I often see triradial dacron genoas on roller furlings.
I am planing to buy a dacron genoa, therefore I would very much appreciate opinions about this subject.


Saludos
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post #2 of 8 Old 11-09-2012
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Re: Is triradial cut adequate for a dacron roller furling genoa?

I don't know where you are getting your information.

Tri radials in either Dacron or laminate make much better sails, that will last much longer. The problem is that tri-radial Dacron is much more expensive than cross cut, and many cruisers don't care enough about performance to spend the extra money.

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post #3 of 8 Old 11-09-2012
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Re: Is triradial cut adequate for a dacron roller furling genoa?

Yes.

Regards

Paulo
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post #4 of 8 Old 11-09-2012
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Re: Is triradial cut adequate for a dacron roller furling genoa?

I have triradial main and jib made from "white dacron", 250g/m2. My sailmaker recommended AP Blade from Dimension Polyant as material and I am 150% satisfied (2012 was the first season with these sails). The jib rolls fantastically and main sets itself nicely and easily in the lazyjack system.

Hope this helps,

cheers!
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post #5 of 8 Old 11-09-2012
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Re: Is triradial cut adequate for a dacron roller furling genoa?

PS: Difference in price between parallel cut and triradial was approximately 15%.
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post #6 of 8 Old 11-09-2012
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Re: Is triradial cut adequate for a dacron roller furling genoa?

I have been told by sailmakers that crosscut is better if you are planning on roller reefing the sail.

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post #7 of 8 Old 11-09-2012
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Re: Is triradial cut adequate for a dacron roller furling genoa?

The reason that dacron is not recommended for use with a tri-radial is because of the bias of the cloth. The strength in a roll of dacron cloth is in it's width, not in it's length. A good definition follows at the bottom of this post.

With this in mind, a crosscut sail with the panels oriented more or less horizontal to the foot, allows the loads to be distributed across the width of the panels, from top to bottom. It's a compromise, but a good one.

However, in the case of a tri-radial, the panels are oriented along the load lines from each corner of the sail. In this configuration, if dacron is used, the loads would be across the weakest portion of the cloth - the length. This is why most tri-radals are made from laminates where the loads can be controlled. An exception to this is North's new Radian cloth which is marketed as a dacron cloth that can be cut to a tri-radial configuration. Thus, dacron cloth is not a good choice for any tri-radial, roller furling or otherwise.

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Sailcloth is woven in two forms: balanced and unbalanced. The yarns in balanced cloth are the same diameter and weight in lengthwise (the “warp”) and across the width of the cloth (the “fill”). Unbalanced means a heavier yarn is used in one direction. Most moderns sails are “crosscut”, which is an unbalanced technique where the heavier yarns is in the fill. This allows greater loads to radiate up from the clew (back lower corner) along the leech (back edge). This is especially true of mainsails and high aspect jibs.

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post #8 of 8 Old 11-09-2012 Thread Starter
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Re: Is triradial cut adequate for a dacron roller furling genoa?

Thank you very much Sabreman.
Your explanation is very clear.

Saludos
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