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=== <br>'''Maximum Possible Efficiency''' ===

<br>The [http://en.wikipedia.org/wiki/Betz'_law#Three_independent_discoveries_of_the_turbine_efficiency_limit, ~~Betz ~~Benz limit] was developed by Albert ~~Betz ~~Benz and is intended to represent the maximum possible energy that a device can derive from a stream of fluid at a given speed. In the case of windmill, the maximum theoretical efficiency of a thin rotor can be found based on the following assumptions:

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The ~~Betz ~~Benz limit has predicted the theoretical maximum value for the power coefficient to be 0.593. This means that the theoretical limit of power removed from the fluid is 59.3%. In comparison, commercial wind turbines are currently able to achieve 40 - 50% conversion due to slight inefficiencies related to the blade design and mechanical process.<ref>Gorlov A.M., Silantyev V.M., Limits of the Turbine Efficiency for Free Fluid Flow, Journal of Energy Resources Technology - December 2001 - Volume 123, Issue 4, pp. 311-317.</ref>

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=== <br>'''Optimal Angle of blades''' ===

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[[Image:Blade Angle cos cos sin.jpg|left|470x274px~~|Blade Angle cos cos sin.jpg~~]]

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= References =