Did it not pop into you mind that if you were going to use that amount of energy you would turn the fan upside down and use it as a propeller?
Unfortunately, due to Newton’s 3rd Law, this design will not cause the boat to move forward unless you point it away from the sail. Kind of paradoxical, in a way.
Dominic Wilcox 
Did it not pop into you mind that if you were going to use that amount of energy you would turn the fan upside down and use it as a propeller?
Unfortunately, due to Newton’s 3rd Law, this design will not cause the boat to move forward unless you point it away from the sail. Kind of paradoxical, in a way.