MR> Ah, I see, I'm not so sure there is a lot of loss in the friction but
  > every little saving counts! Instead of the friction perhaps a direct
  > gearing drive would improve the efficiency you say? Hmmm, that would
  > involve placing the dyno closer to the hub and adding a gear to the
  > wheel with a smaller gear on the dyno to preserve the original ratio.
  > This might be possible... but certainly a propellor would not work.

I wonder if it might be possible to incorporate the wheel itself as a 
component of the dynamo.


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