Absent Ms. Booty's suggestion of Surfer One replacing the fan, yeah, sure -- having the fan blow towards the rear will work in theory. But boats are heavy so you'll need a BIG fan -- maybe an airplane engine with propellor or jet engine? Then you need a fuel source to run the engine, so add a huge fuel tank to the foredeck. Oh, a big battery for the engine also. Now all that will cause the boat to list to one side, so maybe put the fuel tank and batteries in a barge to tow behind the boat? But that will slow the boat down, so.......uummmmmm....... maybe just put all that money into some decent sails?
Denr-- is this really you?