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Magnets... :)
http://www.ctc.org.uk/file/public/feature-hub-dynamos.pdf for your bed time reading
(unfortunately the Novatec is not in it, but it's a nice primer on how to evaluate the hubs)
JWestland
@Skülly
Just read something on ctc about the drag increasing when lights are off at 30kph ... ? Weird...