Jeff Offline Upload & Sell: On
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The source is a movie (frame-rate related, not shutter speed), and that's not unusual; more often it rotates slowly one way, sometimes slowly the other way. The relationship is of frame rate to rotor RPM (multiplied by # of blades); if the latter divided by the former is a whole number, you get a video like this. If slightly different, rotor spins slowly; the more different it is, the faster the rotor appears to spin.
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