Elco electric drive AC motor

http://www.elcomotoryachts.com/elco-motors.shtml

Says it can charge batteries as the boat moves under sail power by spinning the prop by leaving the key on.

Nice looking AC system which has a sealed motor.
Made to drop in place of a diesel or gas motor in a sailboat.

how do they figure out this type of MPG such as 50mpg?
http://www.elcomotoryachts.com/elco-motor-performance-guide.shtml
OK, is this something that is a good idea?

 

"OK, is this something that is a good idea?"

If you wish to add either 5000+lbs of batteries or spend $50,000 on fancier, lighter batts , you might get 10 miles at a crawl.

Charging batts underway does work, BUT , to see how well, find a pail that is about 50% bigger than the diameter of the generator.

Trail it astern to simulate the drag of the charging rig at different speeds..

Good Idea , your decision,

FF