Former NASA engineer turned YouTuber Mark Rober wanted to see if it was possible to blow a boat’s own sail using a giant fan and the answer is more complicated than you think. Technically speaking, when a fan is used to move air forward, you get an equal and opposite push back in the other direction.
Now if you place a forward-facing fan in front of the sail, you capture some of this energy back, but not all of it. Since there are no 100% efficient systems, the more reverse force occurs as the fan’s power increases, thus, even if the sail captures some of that air, your net input to the movement of the boat is negative.
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