iYo: Would a yo-yo phone charger actually work?

iyo.jpg

There's no reason Peter Thuvander's "iYo" yo-yo-powered charger wouldn't work — except perhaps physics. He hasn't actually built one, but suspects that the motion of a yo-yo with a magnet inside would generate enough power to charge his iPhone or anything else that can sip power from a USB port.

Help me out: would this actually work at a rate that would be practical? I haven't the first idea of how to do the math.

iYo project page [PeterThuvander.se via Core77]

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