[quote=al.reed]The downhall (cunningham) relates to your sail shape. The more wind the more outhall and downhall you should put on. When cunningham is applied if flattens the sail and also creates a bit of backward mast bend. This allows air to spill off the sail essentially making you slower. So be carefull how much is applied. As a rule of thumb I apply enough cunningham to pull the wrinkles out of the sail, which disturb wind flow. In heavier winds, if the boat is heeling hard, instead of easing off the traveller or mainsheet, I would apply more downhall and outhall to allow wind to spill off the sail and keep the boat flatter. When you ease off of your mainsheet on a beat it affects the ability of your boat to point. I suggestion playing around with these adjustments in different wind conditions while looking at your sail shape and how they affect boat speed.
I hope this answers your question.[/quote]
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