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It isn't practical as your wind turbine would not be spinning it fast enough to generate useful power. If you are interested in doing things like this, get the following book:
Homebrew Wind Power
A HANDS-ON GUIDE TO HARNESSING THE WIND
Dan Bartmann & Dan Fink
Foreword by Mick Sagrillo
Also have a look at http://www.otherpower.com/otherpower_experiments_tapedrivemotors.html for a discussion of using DC motors for wind power and http://www.otherpower.com/otherpower_wind_alternators.html for a discussion of alternators and generators.
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