well, i'm looking around, and seems like $200 will get my foot in the door. that's new and on ebay. what i'm wanting to know is: 1. are any of these hub motors dual acting (run and charge at the same time)? 2. if not, is there a hub dynamo/motor that will put out enough juice to keep the motor running up to 3/4 of it's max speed? i've seen some e-dirtbikes and such at the scrap yards, and i know some d.c. motors can be ran as generators. i've been riding bicycles most of my life, but now i live in the hill country, let me tell you, hills suck unless you are headed down one! anyway, i'm leaning toward geared (freewheel when not engaged), 24v500w, most likely thumb throttle (so i can keep my 15 gears). maybe this (perpetual charge) is attainable only with a trike (front wheel motor, rear wheels dynamoed)? thanks in advance