Quote:
Originally Posted by 6string
All good suggestions here. Interesting problem. The boat that I am currently sailing is a 20' C Scow. It is all main sail. I race it. Something I have found on a few legs that started out as a run and ended up at nearly a broad reach, is that the leach cord needed to be release completely. It seems that the sail needed to breath more. The sail needed to have a clean exit. I also let out my rear traveler as far as it will go. Great Speed and balance on the helm resulted.
You might want to try flattening your main when on a reach and see if that helps. I would put on some vang and cunningham, make sure you have the out haul tight. Watch the trailing edge and see to it that it has a clean exit. something to try anyway.
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I suspect that therein lies your answer. You have a battenless mainsail and therefore the leech
line has that much more effect. With too much leechline tension you're creating turbulence at the leeward end of the sail. Also make sure you have proper halyard tension. In light air you might want some horizontal wrinkling of the sail to give it more curvature or belly, as wind increases you want a flatter sail.
And SemiJim is correct in that letting it luff and then sheeting in just until it stops isn't a bad way at all to trim your main.