I have a better question... Can you lift yourself up by your bootstraps? What if you jump a little first to give yourself some momentum?
In all seriousness, the fan is going to act just like a propeller would in the water. It will give you some thrust if its big enough. You may even get a little extra from the sails, but no more than you would from equivalent thrust from a submerged propeller.
It's newton's third law of physics. Every action has an equal and opposite reaction. If there's thrust pushing the boat forward, its from the fan onto the sail and rig (pushing it equally backward). The fact that the boat moves forward because of the fan's thrust may draw a little extra air over the foil (sail) which will begin to cause some lift. But this isn't any different than if the 'fan' was underwater I would think.