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Old 06-08-2013
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Re: main sail blown?

the way the blown out sail effects the weather helm is that the draft , max cord of the airfoil has moved back. which does the same thing as moving the mast head back , more aft rake. the center of lift of the airfoil moves back causing weather helm, the same as leaning the wind surfer sail back when you tack to make the bow turn into the wind. look at the sail when close hauled , if the max cord, max belly, of the sail is futher back then about 30% of the cord length then the sail is done. the amount of belly is not as important as where the belly is on the sail.
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