The model is a Precision Aerobatics Ultimate AMR. It comes stock with 3Deg right thrust but when doing the standard vertical up-line test i consistently had the model yawing away left soI added an extra shim that took the right thrust to about 4.5deg (give ar take half a degree). She now goes vertical without any use of rudder. Increased right thrust also sorted out other areas such as a slight sideways drift through consecutive loops, now eliminated. CG is spot of by the way.

It does swing a 14" prop which is pretty huge for a 40" span model so that probably explains the need for more right thrust than usual. It doesn't have any down thrust.


***Edited due to my stupidity***