I'm about to start a project in which I want to study the effects of making modifications to a wind turbine blade. I am going to be able to use various external flow modeling software our aerospace labs. I am a mechanical engineer and am used to using solidworks and I understand that that can be used for some external flow. My real question is here: -I have access to a wind tunnel and rapid prototype machine. I wish to model and place in the wind tunnel a wind turbine blade using the S809 airfoil. There is just a major point I am missing: how do I go about determining the lift/drag coefficients within the wind tunnel? I am far removed from the process of determining these and was hoping someone could point me in a general direction. thanks.