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@gbj_tester
[ame]http://en.wikipedia.org/wiki/Eddy_current_brake[/ame]
Looks good for slowing you down, for generating power not so much. I'd like to see the overall generator efficiency. I suspect effectiveness will drop sharply with separation between exciter magnet and moving conductor (i.e. the rim), so it probably relies on wheels with negligible axial run out. Those of you who commute will have a better idea than me how much work with a nipple key is required to maintain your wheels in such pristine condition.