Sorry Edge, I'm going to dis agree with that article. The two most high performance airplanes in my stable, neither one has ever experienced flutter. Tight linkages and plenty of servo power. The Extra has huge elevators with a single servo, no counterweights, the pylon airplane reaches close to 180 mph. Being semi scale its elevators are a bit larger then on most race airplanes. Each elevator half has its own 65 oz servo and CF pushrod.