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That is a very ... yes it is a question. You may want to look into the legality of having whirling blades of death on the back of your vehicle first.
Being able to tell whether or not it helps Cd would be difficult to tell without a windtunnel as the extra propulsion would first need to be calculated out from the drag forces. Then to see if its worth it is to compare fuel consumption of standard vs possibly lower drag but with extra energy consumption.
I'd love to see the test.
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