You get the highest efficiency per blade with the fewest number of blades (1 blade is the best on a "per blade" basis). If I remember correctly, the reason that you have 3 blades and not 2 or 4 (or more) is because of simple economics. Those huge blades are EXPENSIVE to build, but so is the rest of the windmill, so they do a simple trade and see where the least expensive design lays... 3 blades wins on large designs. I guess this is more of an FYI relating to the number of blades this design (and an older water pumping windmill) has. Any efficiency gains they see may be coming from the number of blades, not all from the housing...
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