I am currently flying a SeaBee and have an O.S. .52 four stroke in it for power. I have to say I am very happy with the the performance that I am getting with the .52 FS (which, dare I say, is the recommend engine size[X(]). It is a very smooth pattern style flyer, but also does very nice snaps and spins. All up weight of my Seabee is 5-1/2 lbs. and I am using all standard Futaba servos except on the throttle (Hitec HS-81). I tell you what, for $100 it is a great deal for what you get. The Seabee that I am currently flying is my second. I lost my first one by getting to low in an inverted flat spin and not having enough room to safely recover.[]