would it be possible to make one rear wheel powered and the other with some 
 sort of friction drive?
 
what i am thinking is, have the motor power one wheel's axle directly, but  
put a break between it and the other wheel axle. at the break put a disc on 
 one side (maybe wood) and a disc on the other side (wood with leather?). 
they  would make contact with one another, not forcefully, but maybe enough 
to give  the other wheel some power when going straight and when you make a 
turn, it'll  allow for slippage - sort of like a poor mans clutch? 
 
Chris,
_Odyssey  Slipways_ (http://hometown.aol.com/odysseyslipways/index.html) 

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