Some bend aft is desirable, while there should be no bend to the side. Variations in wind velocity, wind direction, and sea state require the mainsail to be very adjustable. Experimenting will help you get the best results on your own boat, but these general principles should be kept in mind. Sailing upwind requires a flatter sail than reaching and running. Rough water requires a fuller setting than smooth water.
Light winds require a fuller setting than strong winds.
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