Wind Generators at Sea

      Imagine a rather large propeller on a flexible cable being trailed at sea in the backdraft of the sail. It is constantly turning so that it generates considerable torque which then can be translated to an alternator that is mounted to the deck under a removable, weatherproof box. The electricty generated would be welcomed on any boat making a passage.            

     This free energy could recharge a battery bank or even electrolyze seawater to produce hydrogen that could be compressed and stored as an adjunct fuel or sold on the free market when hydrogen comes of age. 

    My real passion is wind generation. One could mount towers fitted with huge wind generators that create a huge amount of torque.

       One could also use the forward motion of the boat to generate electric power.  The knot log has been used for centuries to judge the speed and count the miles.

   Why not do the same thing with a trailing propeller that turns an alternator mounted on deck? It would be just a trickle charge but over time it could top off the batteries.