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Hi, this is not my design but a remix of http://www.thingiverse.com/thing:10055

However, I use rhinoceros modeling software and I think is good for you define the curves of sweeps between the top and the bottom of external blade profile and then use sweep two rail command using the curves as rails and the naca profiles as sections; let me know if it works

Wind Turbine Blades
by Landru