I also have the flip, it has the YS 63. Mine flies so smooth and pattern like. Much more so than my other 3D planes (U-can, Razzle, Fun World). The only thing I don't like is when landing it will try to balloon (feed a little down elv.) then just stop flying and drop. Anyone else seeing this? Maybe I am too tail heavy. By the way, it does the best waterfalls. Nate