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

- Surface is called A=Area
- Pi=3,14
- r=Radius
- r2=Square radius (r x r)

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.

- (Pi x r x r = WA m2) ==> 3,14 x 1 x 1 = 3,14 m2

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

- (80 Wm2 x 3,14 m2 ) ==> 80 x 3,14 = 240 W

Offered by Geson.