I'm not sure if its the right place, I have a problem with a flying thingy, and you like flying thingies, don't you?
I will be trying to add some means of propulsion to my friend's styrofoam plane (3ft wingspan, 2-3ft length). I have quite a few computer fans lying around, so I decided to add four (two on each side of the hull) 1W, 2x2 inch fans. Now you don't see a lot of propeller planes with their propellers ducted (well, maybe except for jet engines, but they are a different animal), do you? Now, I heard that ducting equals more efficiency and thrust.