PTS: You are going to fly the wings off that Kadet Sr. with a 91 FS on it! I owned one of these planes and had an Evolution 46 2S on it and it flew just fine. These birds are not made for speed or aerobatics. I sold the plane to my dad and he put a Saito 72 FS on it and it was WAY too much power! He now has a Saito 56 FS on it and it's just right. I'd be careful if I were you and do NOT run that thing wide open!