alt.energy.renewable

On Aug 29, 2:28 pm, "Paul Hovnanian ." wrote:
> The propellor design is somewhat critical if you want any sort of
> efficiency. Just any old fan won't do.
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The model plane guys have variable pitch props now. Instead of
fretting about the thing blowing apart from centrifigual force in a
big wind, just feather the prop. A $5 microcontroller and a gearhead
motor could modulate the blade pitch to control the torque and speed
under varying wind profiles. Work smarter not harder. Technology.