Dimples are for round surfaces. If the blades are curved such that air would not cling to the air blade/foil because of it's steep curve, then maybe. Those blades look pretty flat to me. GMICK!
http://www.aerospaceweb.org/question/aerodynamics/q0215.shtml
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Before explaining the purpose of dimples, we first need to understand the aerodynamic properties of a sphere.
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