Having carved perhaps a thousand windmill blades in the 1980's I wonder why more people do not just go to a two bladed prop. My blades really flew, in about 10kts of wind, they filled the circle, ie in theory every molecule of air got to impart it's energy to the blade. fewer blades = less drag, although multi blades may produce more power in light winds.
But most people do not live in places windy enough to pay for a windmill.
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