RE: Chip Hyde CG
P-factor and torque are VERY different things Bryan. P-factor is the force created by the difference in angle of attack between the blades of a propeller. This effect only shows up when the aircraft in question is at a relatively high angle of attack causing the thrust line to be greatly different from the relative wind into the propeller. With our models airplanes, this effect is almost non-existent. Torque is a rotational force ONLY. It does not cause an airplane to yaw at all. The effect you're describing where a force applied to a rotating object shows effects of that force 90 degrees in the direction of rotation is called Gyroscopic Precession, and this effect only occurs during the time period the vector force is being applied to the rotating mass. In aircraft, this is most noticeable when pitching rapidly up/down. It is possible to trim an aircraft for a single data point, but change anything, and this trim generally requires adjustment.
As I said before, fixing something with trim, and design doesn't mean those forces cease to exist. It just means you've been able to counteract those forces through design and trimming. Spiral slipstream effects are very real. The contra system works by negating the spiral effect through opposite, relatively equal effect. Spiral slipstream is the reason a taildragger with a standard rotation engine needs right rudder on takeoff. It's also the reason airplanes using the Vedeneyev M-14P engine like the Su-29, Su-29, Su-31, Yak-55, Pitts Model 12, and others need LEFT rudder on takeoff. This isn't myth, faith, or magic. It's reality.