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Old 12-28-12, 10:41 AM
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interested
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Originally Posted by fietsbob
AFAIK , the dynamo component of All the Shimano hubs Could be based on a Sanyo design ..
perhaps the Sun-race Sturmey Archer ones too .. TW is a small Island..
No they aren't. Besides the fact that the current Shimano "Sport Dynamo" design pre-dates the Sanyo H27 and that they in all likelihood are designed in Japan, not Taiwan, and Shimano dynamohubs uses cups and cone bearings while Sanyo H27 is a cartridge bearing design, they all measure quite different, eg. the H27 has twice the parasitic drag of the Shimano 3N80. The SR-SA's hub I have seen measured aren't even in the same league as the H27 when it comes drag, output and efficiency.

Sanyo the Corp. is a post WWII company, while the British SA made dynohubs in the 1930's. Old SA dynohubs have some internal resemblance to Shimano dynamo hubs but differs in several ways.

A hub dynamo is simple thing to design, so all designs tends to look alike with a stator and a rotor and some wire encased in a hub shell. Shimano would of course have examined old SA dynohubs when they started producing their own, but they certainly didn't copy them, probably they learned more from the faults of the SA hub than from its fundamental design.
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