Latest update. I made new aileron pushrods that allowed me to move one hole in on the servo arm (on the inner most hole now). This allowed me to increase the total servo travel somewhat which means slightly improved resolution. I cut the trim rate in my JR 12x TX from 4 to 2 so the maount of servo travel/er beep or click of trim is finer and more precise. I checked the weight of each wing panel seperatly and they are within an ounce of each other so I dont think that is relevant. I checked the elevators level relative to one another and found a very slight misalignment and corrected it. I checked wing incidence in a rather crude way ( cant find my incidence meter) and they apprear to dead on our very nearly dead on. Eye balled the wings for warps and dont see anything obvious. I found a very small area where the wing trailing edge at the root was cracked and might have been allowing a very small part of the traiking edge to deflect into the slipstream. Repaired all three ares, top and bottom of right wing and bottom only on left wing. Made a mostly unsucessful attempt to get the nose gear door to close the last little bit. No way of knowing if the door is being forced closed in flight by the airstream or stays the same amount open or opens even further due to low pressure area in that location. Probably has little or no effect on the way the plane flies but not sure. It could very well be opening further an further the faster the plane flies and maybe this some how causes a slight rolling moment. I will contine to work to get a completly closed door. Also made sure both ail servos are screwd down tight and made sure jam nuts on both ailero linkages are down tight against the shoulder of each aileron clevis ?

I made one flight today after all of the above. The airplane trim for a constnt airspeed was improved and while not totaly " ON RAILS" dead solid perfect it was improved or so it seemed. However, the faster I fly the more the airplane rolls left ( or was it right?? LOl, Im pretty sure it was right. It seemed like the amount of roll was a little bit less than ot was on tuesday, but still noticeable and undesireable at the very least. If I had had time to make another flight I would have tried with the trim rate set to 1 which would have meant even finer and more precise triming of the aileron servos to see how that would fly. I probably need more precise servos to notice much if any improvment from this. Otherwise I dont know what else to try next. I will probably install some JR digital servs on aileron and see if that helps.

Untill I find the warp or misalingment or whatever it is that is causing the need for left trim to fly straight I suspect my symptoms will cotinue and I will just have to fight it constantly retrim. I suppose I could put a gyro on he aileron chanel and see if I can make that work.

The airplane is the large Jet Legend L-39. Has anybody else had similar issues with this plane and what did you do to fix it ?