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User avatar #9 - mondominiman (10/15/2013) [-]
I thought those things had generators underneath.
User avatar #12 to #9 - stealingbikes (10/15/2013) [-]
The generators are in the head, connected to a gear reduction system. The vanes are so huge that if they spin fast enough to directly turn the generator they blow apart like the GIF in post #7. They're supposed to maintain a constant speed that's regulated by a motor changing the angle of the individual blades to compensate for wind speed. This keeps the generator speed constant and reduces wear and tear on it.
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