This may sound strange but after helping an older man get a plane to fly with an underpowered engine, I have been thinking of this as a challenge and want to give flying a larger plane with a small engine a try for myself.. We did everything possible to get that plane in the air and finally it flew. I found that the hardest part was getting it into the air and once you have altitude you can fly as normal, without stunts of course. My question to you is have you experienced this? I was thinking of getting a plane with plenty of lift and just trying to see how small of engine would fly it. For example, a 40 size trainer and maybe a 15 or 25 size engine. If you have experience lets hear about it.