RE: Guillow's Spitfire Build
Hi AL! To control flutter, I keep the torque rod short, and use 2-56 threaded wire push rods. The control surface needs to be thinner than the part it is hinged to, and I cover the parts as a unit, so there is no hinge line gap. Finally, for a fast plane, use the inner holes at the servo arm and go at least 3/4 inch up on the torque rod or control horn end. It also helps to use medium weight balsa sheet for the control surfaces instead of light.