Not sure why so many people want to overpower this plane. It is a scale airplane and it flies like a scale airplane. It's not a 3D plane or an extremely aerobatic plane, it's just not designed for it. I have an OS .61FX in mine and it flies beautifully, it acts and responds just as the full scale Spacewalker would which means you have to fly it. Personally, I think this offers the most enjoyment from a plane such as this. I'm not degrading anyone who chooses to overpower ANY airplane but if you have never tried flying a bird such as this in the scale manner, do so, you might be surprised at how much fun it can be not to mention rewarding. I know, I know, with a big engine you can always throttle back, but when you don't have that extra throttle reserve, it sorta forces you to fly it scale. Flying this type of aircraft slow and scale is very cool and always draws a lot of attention at the field. This is just my opinion on this type of airplane, nothing more.