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It's also most efficent to cut out as many steps as possible when trying to get work done, like creating electricity, that is why the alternator runs off the engine and not the wind, air plains do the same thing and they have a 2nd alternator that can drop down that does run of the wind to power the controls when the engines start on fire and die but they hope never to have to use that.
also the wind at the front of the car is going to be very turbulent, as it is being compressed as it trys to move around the front of the car, propellers also have a speed range that they work well in if you go above or below this air speed then their ability to produce usable power drops off, so one designed for 50mph would hardly move at 20mph.
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