The turbine blades are set to operate under a variety of wind speeds. It is true that they will pass a lot of wind at 5 mph apparent wind speed. It is also true that as the wind speed increases the blade speed also increases to the point that each section of the outer 1/3 of the blade length will be ever closer to the turbulent air coming off of the previous blade. Clean air flow is assured by the spacing provided by the 3 blade design. The tip speed is way higher than the air speed. Aermotor style mills with 20 plus blades were very poor designs and each blade blocked the wind from following blades when wind was even 5 mph. It took me a month of thinking to wrap my head around the idea. If a person could see a 12" balloon float into a large windmill, they would see that it would be unlikely that the blades would missed the balloon in the outer 1/3 of the blade length. Toward the middle, not so much. But 80% of the power is generated in that outer area. Jim
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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