I had this problem about a year ago and could not find anything wrong. The only thing found is that the engine rubber mounts needed replacing. Changed the rubber mounts last spring and it has been flying straight until now. It is yawing to the left again after doing a loop. It will fly this way for a while and then straighten it self out again. I checked the tail wheel for free movement and the carpet for binding recently and found no problem's there. The engine mount is a conical mount. Any ideas?
Vic
Vic
