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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[–] 4 points 3 weeks ago*

That is true for basic jet engine, but most modern high-bypass engines are basically big fans powered by a jet engine. The air moved by the outer blades provides up to 10x the thrust of the hot air exiting the core.

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