Hello, I would like to know if there is any way to know how many degrees of engine thrust or power line change is required for some specific model in order to get a better flight.I flew a Richmodel Long EZ 160, which comes with the engine fixed in a "rectangular square" area on the rear part of the fuselage, but had lots of trouble trying ti keep it flying straight and level, with a strong nose down tendency, this situation were reduced in proportion of engine power reduction, means the less engine power the less nose down tendency, I even had to use full trim up and fly the model with half elevator up stick.There were no problems at idle power.So I was told to change the engine thrust line by rising the bottom part of the engine mount about 2 to 3 degrees. That's will help to lower the tail and keep the nose level then with some minor trim changes in flight.I am using a OS MAX 1.60 FX glow engine, a MA 16x10 3-blade pusher propeller, and the model weights about 18 pounds.In all scenarios the model was well balanced.

Thanks, Isaias G.