Im currently putting together a Showtime 4D and dont know which engine to use. I have a 91 FX that im thinking about using. I was also thinking about using a Saito 125 or possibly a small gas engine like the Evolution 26 GT. Ive heard that the 4 stokes are not as reliable as the 2 strokes. I will be using the plane for 3d and more slow flying than anything. Any insight will be a great help also what prop size to use.