Airplanes deploy revers thrusters when landing which are basically just shaped metal shields that move into place behind the engines to provide reverse thrust and slow the plane.

But adding a fan on a sailboat is seen as stupid and doesn't work.

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They tested the fan on a sailboat on MythBusters, and were shocked that it actually worked. https://mythresults.com/blow-your-own-sail

It didn't work well, but it did work.

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