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A common reason for sailors to be using only the mainsail is because the wind is light and/or blowing in an unfavorable direction from their intended route. In that case they'll frequently raise the mainsail, and use the motor. It's called "motorsailing." The motor is what mainly drives the boat, but the sail helps a little, and the sail also steadies the boat, so that it doesn't roll so much in the waves.
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