So I kind of wonder if there is any efficiency difference with bullet-nose cones in the middle of a turbine, etc... I also wonder if the airfoil design is really that much more efficient than just using a tilted blade at a fixed angle?
By "that much more efficient" I mean: Should I go out and buy a 3 blade plane prop to make a windmill, or should I just make 3 sticks from old boards with tapered edges and a fixed pitch to the wind?
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