Windmill or Wind Turbine- powered boats: how many are out there, and are they viable?

 

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“In the late 1990’s I built and tested two different versions. They went quite well directly against the wind, but more development work is required to get them optimised.”

http://urlet.com/shines.ashamed

http://www.boatdesign.net/forums/projects-proposals/windmill-wind-turbine-powered-boats-how-many-out-there-they-viable-14182.html