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The main driving force is mainly from the genova. The wind is deflected by the genova and the main cannot generate a good dirive. Its main function is to keep the boat on course. The ise of the genova does not matter to much to deflect the wind. Even you use 100% genova the wind will be blowing nearly from the head of the boat when you consider the main sail. It is a good idea to keep the genova area maximum if you can trim it correctly. Do not worry about the main, it will not generate enough drive.
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