Earlier quoted context omitted.
I don't know of any data but the following fundamentals are driving this: "The equation for wind power(P) is given by P= 0.5 * ρ * A * Cp * V^3 * Ng * Nb where, ρ= Air density in kg/m3, A = Rotor swept area (m2).Cp = Coefficient of performance V = wind velocity (m/s)Ng = generator efficiency Nb = gear box bearing efficiency." http://www.ijsrp.org/research_paper_feb2012/ijsrp-feb-2012-0... Area, A, is equal to pi * r^…
why 2 blades not 5?
It's 3 blades not 2.
3 is the optimal between wind area and turbulence.