With regard to windmill design or rather windmill electronic controller design. Does anyone know of any sites that discuss the relationship between windspeed, power and efficiency.
For example,
In a 20mph wind, as I take more current the voltage will drop and the blades will slow down. At some point I will get maximum power out of the 20mph wind. If my blades go 60rpm with no load, I may get maximum power at 54rpm(10% slip) or 30rpm (50% slip). Is there an equation or rule of thumb to calculate the ideal "slip".
Mike.