>I have considerable experience in this area for exercise bicycle
>applications. I build the electronics rather than the alternators but
>can probably provide some advice. A power level of 50 to 100 watts is
>probably realistically achievable long term. You can produce peak
>power at well above this level but you wouldn't want to do so for
>long. I can "burst" to 500 watts or so but rapidly find it most
>unpleasant.

The German Model train manufacturer Marklin has a two track Gauge 1 layout
it takes to shows, with a pair of pedal driven generators, and gets the
youngsters to race a pair of locos up a helix of track. The harder you
cycle, the faster the loco goes.

Watching the kids blow their lungs out for a minute or so as they race their
friends is somewhat amusing.

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