I don’t get how this is physically possible if the direction you want to go is literally the opposite direction of the way the wind is blowing. How can it ‘push’ them the opposite way it is going?
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The sail is at an angle to the wind. The wind pushes against the sail and the keel of the boat (or the fins on a sailboard) prevents the boat from being pushed sideways in the case if it wasn’t present. Therefore, the force exerted on the sail is redirected towards the rear of the boat and pushes the boat forward.
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