Perhaps the most commonly recognizable icon of renewable energy industry , the horizontal axis wind turbine has come a long way from its historic origins in milling grains and pumping water.
Early wind turbines typically had at least four blades , and sometimes many more. The first megawatt capacity turbine,built in Vermont in 1942,had only two large blades.There are some interesting modern examples of single-blade turbines as well.Standard contemporary utilities-scale models typically have three blades and can have capacities as high as 10 megawatts.
The capacity of the modern HAWT is a function mostly of the overall outside diameter as measured from tip to tip, with some larger models exceeding 100 meter
smaller units can be designed to rotate with assistance of a vane on the downwide side.Larger models must be turned more slowly by computer guided gears
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