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BareNecessities
I dunno, RTFA :)
All I know is that if those maths are correct people are overpaying for their dynamos.
"Given the leverage of a wheel and the flywheel effect of the rotating mass, dynamo hub drag only has a small effect on your speed. The result for most people is likely to be an extra three to six minutes riding time over 100km, all while getting a good charge to your electronics (or while running lights)."