High Quality Content by WIKIPEDIA articles! Devices that are powered by sails (such as sailboats, iceboats and sand yachts) can sail (that is, advance over the surface) faster than the wind. Of course they cannot do that when sailing dead downwind using simple square sails that are set perpendicular to the wind. But they can do that by setting sails at an angle to the wind and by using the lateral resistance of the surface on which they sail (for example the water or the ice) to maintain a course at some other angle to the wind.The Extreme 40 catamaran can sail at 35 knots in 20-25 knots of wind. The high-performance International C-Class Catamaran can sail at twice the speed of the wind. Iceboats can typically sail at 5 times the speed of the wind. By sailing downwind at 135 degrees off the wind, a sand yacht can sail much faster than the wind. The velocity made good downwind is often over twice as fast as sailing directly downwind.

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