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Don't electric motors have the most efficiency at higher rpm? I was looking at building a mid drive Ebike and most people say downshift a few gears once you get up to speed as it runs the motor faster and you get a few more miles on the range. That may be also because your faster (although easier) peddling may be adding more power as well. I suppose you would have to look into propeller efficiency. I know with water propellers there is a point where enough low pressure forms to "boil" the water releasing gas and letting it slip. Air is aleady a gas so maybe fast as possible is fine.
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