I have to disagree with you CAP232CM. I have a UCD 60 with a YS91fz and it will do staggering flat and knife edge spins as well as blenders, waterfalls, etc. The only thing I found it really has a tough time doing are Cobras and such because of the wide wing and proportionately small ailerons. But overall it is a terrific first 3d plane or a good standby to keep in the hangar for seasoned pilots.