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Staska: Thank you for the colorful sketch. It is correct and a lot clearer than a word description.
You are right about the unsprung weight being a problem with the Poulsen setup. They probably will have to use a heavy duty truck/trailer tire to prevent blowouts. There is another problem also, and that is the one concerning the torque arm connecting the wheel-mounted-motor to the chassis. This arm must be capable of changing length because the car's suspension probably travels a different path than the arm's swing.
An Etek motor weight is about 23# bare, add some kind of torque multiplication/speed reduction (4:1 or more) and you are back up to that 35-40# range. If you move the Etek motor up the arm toward the pivot, you will lessen the unsprung weight and if you have a large pulley mounted to the wheel and small at the Etek motor you could probably get about 23:80 at most which is probably not enough. You might need some additional multiplication/reduction.
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