Yes, like you, I have experience in various applications but not generators specifically. In small DC electric motors the ultimate power is limited by cooling. By changing the winding you can get different RPMs out of the same motor. Even as much as double. You can also adjust the windings until...
Over at the Airborne Wind Energy forums we are having a debate about the physics of a generator.
The question was posed that if you could generate 1kw of power in the form of rotational torque at 2 different speeds, one begin half as fast as the other how much more would the generator weigh...