I am guessing that the propeller propels a belt/chain which is geared into the wheels.
Lawry On Sep 21, 2010, at 1:26 PM, Jed Rothwell wrote: > I do not see how this can work! They are going with the wind, so if they > start to travel at the same speed as the wind, the propeller should stop > turning. > > Maybe I am missing something. > > - Jed >
