Sailboat Pictures If A Sailboat With Open Sails Had A Strong Fan On The Back Blowing Air Into The Sails, Which Way Would It Go?

If a sailboat with open sails had a strong fan on the back blowing air into the sails, which way would it go? - sailboat pictures

'OK, this photo:

A sailboat in the water is calm, no wind. The sails are open. A fan at the rear of the vehicle an unlimited amount of air into the sails.

Is the boat forward or backward?