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Originally Posted by Cd
Around 2000, Popular Science / Mechanics had a small write up on an electric van with a fan on the roof. ( It was mounted horizontally. )
The blades were designed in such a way that they would fold flat as they turned, thereby reducing drag.
They claimed that even in a parking garage, the wind would turn the blades.
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Vertical axis FTW.
Flow – Wind Solar Energy System | Tuvie
Variable pitch blades made from compound curved photo-voltaic panels. If this isn't happening, it should.