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  #1  
Old 08-29-2013
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Sail twist

Ow do you trim sails to get twist?
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Old 08-29-2013
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Re: Sail twist

Adjust the various bits of string tied to them

For the main, a combination of mainsheet and traveller, for the jib/genoa, move the car (or the block if on the toerail).
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Old 08-29-2013
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Re: Sail twist

Gross oversimplification:

Close-hauled, with slack vang, less mainsheet tension gives more twist, and vice-versa.
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Old 08-29-2013
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Re: Sail twist

Quote:
Originally Posted by nolatom View Post
Gross oversimplification:

Close-hauled, with slack vang, less mainsheet tension gives more twist, and vice-versa.
I'm not being a wise-guy... being a newbie to sailing, I don't understand how you can be close hauled with less mainsheet tension. Can you elaborate?

Thanks..

Barry
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Old 08-29-2013
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Re: Sail twist

Still simplified....

It comes from a combination of traveller setting and mainsheet tension. In light air many boats respond well to a traveller position to windward, reduced sheet tension, but the boom still near the centerline.. the reduced tension (with vang relaxed as nola qualified) allows more twist in the sail because luff tension is reduced. Excessive sheet tension in this condition would put the boom to windward of the centerline and likely stall and/or cause excess heeling.

Similarly in heavier air the traveller is set lower on the boat, reducing angle of attack.. the mainsheet tension can be played to the desired twist, but will require more tension to keep the boom near center (until the breeze builds enough to drop the traveller and let the boom fall away...) With a good traveler setup you can 'play the puffs' to control heel with the traveller alone.. much quicker/easier than dumping/hauling several yards of multipart mainsheet.
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Old 08-30-2013
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Re: Sail twist

Great explanation of traveler usage, faster...thx....
but....
Is "twist" soley used to de-power; or is there some other reason. I can get a fair shape using end-boom sheet, vang and cunninham. I see some natural twist when I have enuff breeze. Last Monday's sail was a bit brisk by early afternoon. I ended up approaching the fairway at 5 +/- knots with the boom near out alla the way and the little 85% jib let out right far. Would slacking up on the vang have calmed her down a bit w/o relying on the main being near luffing?? Felt like the wind was running near ta 15 and gusting a bit to 20....mebbe more, I dunno. Got a bit hairy for this sedate-to-date sailor!
I (also) wonder if actually remembering to put the (short) battens will upset my old sails? What effect do battens have when "twisted"? Help or hinder?
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Re: Sail twist

Twist gives you different shape at the bottom of the sail to the top of the sail. It can be used to depower or power up a sail depending on how you use it.
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Old 08-30-2013
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Re: Sail twist

Quote:
Originally Posted by Faster View Post
Still simplified....

It comes from a combination of traveller setting and mainsheet tension. In light air many boats respond well to a traveller position to windward, reduced sheet tension, but the boom still near the centerline.. the reduced tension (with vang relaxed as nola qualified) allows more twist in the sail because LEECH tension is reduced. Excessive sheet tension in this condition would put the boom to windward of the centerline and likely stall and/or cause excess heeling.

Similarly in heavier air the traveller is set lower on the boat, reducing angle of attack.. the mainsheet tension can be played to the desired twist, but will require more tension to keep the boom near center (until the breeze builds enough to drop the traveller and let the boom fall away...) With a good traveler setup you can 'play the puffs' to control heel with the traveller alone.. much quicker/easier than dumping/hauling several yards of multipart mainsheet.
Good explanation, just one minor correction!

North Sails has some good animations in their tuning article: Here
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Old 08-30-2013
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Re: Sail twist

Quote:
Originally Posted by SchockT View Post
Good explanation, just one minor correction!
Right you are, of course...leech, not luff....

Thanks, Schock..
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Last edited by Faster; 08-30-2013 at 02:07 AM.
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Old 08-30-2013
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Re: Sail twist

Is that what all those ropes are for that are lying around everywhere? Who knew.
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