Now that you have read all about CG and Coupling I will go back to what Chuck said, the Twist will do most everything but it's a fun fly plane and the way the fuse is designed it isn't going to ever give you that cool down the runway knife edge. Even a lot of the old pattern planes don't KE very well. This season I had to do repairs on my old Kaos and give the poor thing a new covering job. It never did a great KE either so I added a big long fin to it plus added to the rudder giving both more area. This changed the way the plane fly's a lot. Now it does the KE about the way I wanted it to do plus it tracks a lot better. Down side to it is flying in a cross wind, more like landing in a cross wind!! This plane has been with me for a lot of years and I know it like the kid brother I never had so I have no problems with it but you should hear the guys in the pits when it comes in looking at me. I do it for fun but it may bite me some day.