Thanks Zor, I have built lots of IMAC type airplanes and have notes on how much offset it takes for most 50, 100 and 150cc engines to get 3 degrees. As for the adjustments and mixing, it's what I start out with on any scale aerobat. Usually gets me 90% there. Trimming an airplane correctly is a science that seems to be dying. Most of what I see is guys getting airborne at full throttle and then pushing the trims for strait and level. Some will fuss with the CG a little but thats where it stops. Most airplanes at the field are flying way below their potential. But you know my feelings on this matter from other threads