I use a leaf blower on my boat. The engine is small, although a little loud, especially when submerging the blowing end in water to make the turns. The reason I use it instead of the trolling motor is that I have found it more useful in dead air. I can just blow in the sails and find that it moves the boat along rather nicely. It also works for cleanup in the cabin.
Twenty years from now you will be more disappointed by the things y%^&*.....oh never mind. 90% of the people on sailing forums already use that as their signature! I'm not a conformist.