Benjamin and his kite

There are many stories about Benjamin and his kite, and perhaps the most famous is that he tied a brass key to a kite and flew the contraption into a lightning storm to see if lightning was made of electricity.  Well, now we know that lightning is made of electricity, so we do not need to repeat that dangerous experiment.

But in his autobiography Benjamin also wonders if he could use a kite to move a rowboat, like a sail moves a ship.  Our adventurers stumbled on Benjamin as he was carrying out one of his famous experiments.