Well...I kind of cheated. I am using one of ed lenz's "mini gens" as the heart of it, so i didn't choose the magnets or the coil, etc. I just fitted it with some longer PVC blades and the pvc chassis and pole.
You can learn more about the mini gen here
http://www.windstuffnow.com/main/minigen.htm
I got the one with the metal housing.
Its a low amp high voltage setup...but it shocked the CRAP out of me when I was putting alligator clips on the LED to provide a load.
I'm sure you could mod it with permanent magnets...and then fiddle with the wire size and # of turns of the single coil to tweak the output.
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