FLUTTER - I haven't had any problem with flutter using the stock hardware. I don't do 3D yet, but have put this thing through some hard manoeuvres, like continuous snap rolls & loops, without any in-flight problems other than my 55AX dying on me. I did bump my wing aileron at the airfield a couple of times on crowded days into a post and the control rod bent. It happened a second time on the other wing putting it into my trunk. So, I replaced them both with new 2-56 rods bent & cut to fit, but sleeved them with carbon fiber tubes (epoxied in place). I used the DuBro 2-56 Heavy Duty Clevis with Secure Clips just to make sure nothing comes off when I install a more powerful engine. I still used the stock plastic quick link on the bend end. The rudder & elevators are still stock connections and the servos are in the battery/receiver compartment.