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If you start by making a 2 meter inch diameter turbine the calculation is as follows:

The radius for a 2 meter turbine is 1 meter, and to know what effect we can get from this turbine we need to know its working area (WA) in square meters.

If the wind velocity is 5 m/s (as in the table above) the effect is about 80Wm2 (Watts per square meter). You get approximately 1/3 (0,35) from the Natural force which should give an effect of about 80 Watt using this small 2 meter turbine

Offered by Geson.