Not mentioned as an alternative is a piece of rope with a propeller on
the end dragged behind the boat and fastened to the shaft of a DC
generator. The "rope" must be of sufficient size and material to be
up to the job and the propeller should be on the end of a 3 to 4 foot
metal shaft so as to give it stability.


thats absolutely brilliant! did you hook it direct to the shaft, or via a
pulley? Thats so simple it almost hurts that i didnt think of it first ;-)

Shaun