Why would having something like that be better than the alternator that is already on the car? You're still going to have drag on the crankshaft. And you're going to have to do a bunch of fabricating and wiring, and put together a circuit with a voltage regulator. AND assuming something like that could work as well to charge to your battery as the factory-supplied alternator, that type of set-up would have little protection from water, mud, grease etc. collecting on its vital parts.
But any, there is a website that I know of (otherpower.com)
that has a bunch of info about home-made wind turbines (giant alternators) that may have useful info for you.
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