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Originally Posted by sanddrag
Well, take for example an ordinary fan. The faster you spin the motor, the faster the air flow is coming out of it. Now reverse the idea. Instead of a motor, put some sort of encoder on the fan blade. The faster you are moving through the air, the faster the fan will spin (and the encoder will read this). I'm guessing it is a linear relationship but I could be wrong.
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How about a volt meter?
The faster the motor spins the higher the voltage! And it can act as an alternator to charge the battery! However as to the aerodynamicness (yes i know its not a real word!
) of it all....