How does Altitude, Temperature and air Density and Viscosity affect my rotor design?
A. As the previous question, your rotor is optimised for a particular tip speed ratio. As long the ratio is maintained, your same physical rotor will still be optimum at any air density. Air density and windspeed both affect power and so affect the matching to your generator. Altitude (ASL is Altitude above Sea Level) and Temperature merely affect air density and are provided as a shortcut to compute air density. Air viscosity is only used in computing reynolds numbers. The default values for air density amd viscosity will be good enough for all practical design purposes so no changes need be made to these parameters.
