Blade Length:
Blade length is also the radius, or ½ of the diameter of the swept area
Air Density:
Air density changes with altitude, and air temperature. Cooler air, or air at lower altitudes, produces more power.
Air Density Calculator
Coefficient of Power (Cp):
The efficiency of a turbine at converting available wind into electricity. 35% is the max after taking into consideration Betz, bearing friction, and alternator inefficiencies. We use 25% for our Axial Flux.