Well I evidently don't have a problem then because right now both engines transition beautifully. Good information for the future and to share around the club though. No one seems to know much about these engines except that they put out great power and they like them. Anyone with a .60 size 3D that isn't flying a YS is under powered compared to our planes. That's not only an opinion but an observation. I'm sure the rest of the sizes are the same as the really serious 3D guys in our club are flying with YS regardless of size. Of course the real pros in the club are flying DA 150s but they still use YS on their small scale. Great product if you want raw power for 3D.