britbrat
Glad to hear from you. A very experienced modeler told me that amphibian type airplanes that have the motor located above the wing require as much as 8 deg. upthrust. This would seem logical due to all of the drag that hangs below the engine and must be counteracted. I have not personally had experience with this type of airplane.
In my comments I did not necessarily mean that the motor is set at an up angle from the line of thrust. I merely reduced the amount of downthrust built into the airplane. Two of these experiences were with a SIG 4-star 60 that nosed up violently on its maiden flight and I was barely able to control it to land it. Reducing the built-in downthrust cured this problem and the model performed very well until its recent demise due to a low battery. The other experience I had was with an LT40, a high-wing airplane. Reducing the downthrust also cured its problems and I now fly the engine with an OS .61 FX which is more power than the model originally was designed for. The LT40 performs very well with these adjustments.
Glad to hear of any comments, negative or positive about my opinions.