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turbo1889: I'm not sure if my design I'm contemplating would allow use of the motor as an assist. It's going to be a left-hand drive with a freewheel on the jackshaft out gear. This would allow me to pedal on the flats and moderate hills without having the drag from the motor slowing me down. Does an assist bike not utilize any freewheel on the motor gearing? If that's the case, does the motor create undue drag during pedal only riding such as when you run out of battery or have a failure?
Edit: A little research answered my question. Thanks again. Mike