Ask me this question on a airplane, and I could come up the probable reasons why, and solutions. But I am not sure as to the possible causes on my T-Rex 450.

Basically, when into fast forward flight, the heli wants to roll right and tends to dive. It's also not an insignificant amount and very noticeable. In hover, slow forward flight, etc, it seems very neutral. I know some of this is probably aerodynamic, such as dissymmetry of lift, from what I've read in the past. Is there something I can adjust to eliminate this, or is it an aerodynamic fact that I'll need to live with and trim out.

My T-Rex 600 electric and Nitros do not seem to have this tendency, or its so minor its unnoticed. Perhaps more pronounced in the smaller helicopters?

Thoughts?

Thanks

Check the paddles to make sure they are zero to each other and stay zero as you spin the head.

Is there any interaction in your swash? with the motor disconnected, check to make sure that when you give forward elevator there is no right cyclic being applied. Then do it again while moving the throttle up and down. You might have a binding issue somewhere or you may have to play with the end points on your servos.