Thanks it is elegant for 1:1 ratio thanks!
The front wheel hub motor is the perfect solution just skip the steep hills and dirt fields unless you pedal.
Relatively flat to work? Just switch to lipoly on a hub motor and go double the distance with half the battery weight.
The weakness of the front wheel hub motor is it can not supply low speed torque and high speed riding in one package.
To bring us a dynamic speed and torque range, more fun and lower cost we need chain assist.
With chain assist we still get our gears and the motor is able to help with much force at slow speeds or much speed when traveling fast.
From the first video where the motor is direct drive one person made a nice chain assist.
If we can have a machinist make an adapter for the motor we are able to have a bikeforum open gear project.
I hope for something easier however.
The project calls for gearing through chain.
The brushless motor rpm is reduced to turn small sprocket which powers bike chain with high torque.
First version needs no freewheeling it is a flat ground power test. Legs in the air with pedals spinning around.
How about a piece of wood with the motor mounted on it facing up.
The sprockets are bolted on the wood and the reduced sprocket spins off the side.
The board is simply mounted on the frame and presses down on the chain either behind the main sprocket or in the middle if it has a guide to keep the teeth in the chain under torque.
Does that sound feasible?
Last edited by outrunner; 11-12-08 at 09:09 AM.