Why is it more efficient for wind turbines to spin slowly?
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Well, on the contrary, energy generated by a wind turbine is affected directly by the cube of the wind speed (V^3) and thus by its rotational speed. read more
More than 3 blades would be useful only in low wind conditions, but in most cases there is more than adequate AVERAGE wind speeds to spin the rotor at its optimum RPM. In fact as wind speeds go up the blades are “feathered” to dump excess lift to prevent an RPM overspeed. read more
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Further Research
History of Wind Turbines
www.renewableenergyworld.com
How do wind turbines work?
www.explainthatstuff.com
Small-Scale, more efficient, Urban Wind Turbines
fuel-efficient-vehicles.org