thanks!
my original idea was to get a car power steering motor (I read an article about an electric bike like that with really simple control electrics) adn use that.
However I have the problem of the gearing.
I'd put a second chain on the left side and have a chain to the motor/gears.
i could not find a "gearbox" which would suit me.
there is a company importing motors, and they do sell motors with gear reduction, but they are costy and I'd rather trust in a motor from an Opel or Toyota...
All their motors are either on 24-36V, or below 250W. I found batteries for good price. would be ideal for 12/24v batt rack, and I'd not need a third battery for a 36V system. I hope it makes sense.
All comes nicely together apart from the gears...