Cool. I had a bad experience with a float plane that weighed 8 1/2 pounds and the co. (Modelfly-all plastic) reccomended the use of a .46 2 stroke which is all that could be fitted in the plane without major modifications of everything and the plane could barely get out of the water. The underpowering was the cause of a couple of crashes. I installed an OS .61 FX in it and did all the modifications and repairs and I will fly it later this week. Since then I have erred on overpowering everything at least a little bit. I installed a Saito 100 and the Stuka balanced 2 oz. nose heavy by moving the battery behind the servo tray. Another bad experience/screw-up has caused me to leave my planes a little nose heavy at the farthest forward reccomended CG point to start with. I balanced a P51 (AK models) at the most forward CG point so that it balanced perfectly, checked and double checked it using my GP CG machine and when I flew it on it's maiden, it was tail heavy. Fortunately, while it flew crappy, I did not lose the plane. I took off 2ozs. of tail weight that I added and it flew great. All I had to do is adjust the trims a little.