Originally Posted by HighPlains

I don't worry about the trim at low speed, it's getting it trimmed at high speed that makes an effective racing plane. So trim it at speed to fly level, then kill the engine. If it stays on it's path just as the engine dies, then you have the wing and tail incidence correct. If it climbs or dives, then you have the thrust working against airframe errors.

A few years ago, I was experimenting with the engine set with 2 degrees of down thrust, which meant that when I killed the engine the plane would climb very rapidly until the speed burned off. This was just an experiment to find out a few things about props on pylon models, but it made trimming the model rather difficult.