I tried to build a mini-wind mill from a few popsicle sticks and a HDD motor (Computer hard drive) but apparently, the HDD motor won't produce power, only consume it.
Anyway, it was turning out pretty good, but didn't work, and wouldn't have been very efficient, since those motors are high-initial resistance (Until it hits high speed, you can actually feel the magnetic force acting on the armature.. It feels like it clicks around)
Here are pics, though:
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