Well as you read mine was on take off. I was doing a very shallow climb out so speed wasn't the problem. The YS 110FZ was running great, no sputtering at all. Definatly wasn't engine problem. It rolled without any warning at all. It reacted to my radio inputs but kept on doing it's own thing each time. Glad to hear you all have had better experiences with yours. We thought that the recommended throws were too small. 3/8" for ele seemed to little, but everyone I read said more than that caused pretty radical movement on maiden, so stick with it till you get used to the way it flys. I had high rates set at 3/4". Never really had time to switch.