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I saw the vertical eggbeater versions in a demonstration in 1976. The company claimed they were more efficeint than the propeller design, but all I see are the propeller style windmills, so something must be driving the selection.
BTW, the kite idea sounds interesting, but if enough people did it I could imagine a real hazard to airplanes. It would be like having barrage balloons in WWI and WWII.
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