Webmaster Artist: Bernward Frank @ http
The core of this object might be called a three-dimensional angle crank gear. Take a look at a shadow of a rotating shaft that is bent at its end. It performs a back and forth movement. If then on the angled portion of the shaft a bearing is pushed and on it the two wings are fixed, this works similarly in the room. With wind the paddle perform a pendulum motion. The wing which is perpendicular to the wind, will he pushed 'back'. At the reversal point both wings rotates by 90 degrees. Said surface cuts the wind on its way back. The other wing at the same time makes the opposite movement.
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© Bernward Frank