dick747

This article describes what you might call conventional flutter particularly of a wing. Mass distribution, stiffness and aerodynamics all play a role. Swept wings in particular have coupled bending torsion modes that can be susceptible to flutter. Flutter does not require "two modes with the same natural frequency" as the article states. I have seen leading edge slat flutter involving single axis deflection of the slat basically resulting from inadequate stiffness of the support arms. I have also seen loss of most of a vertical tail that involved not only the tail but single axis rotation of the rudder and interaction with the rudder actuation system. Flutter modes can be simple or very complex involving multiple axis deflections.

There are many forms of flutter. Control surface flutter normally does not involve any twisting of the control surface. Usually just deflection of the control surface against the control system or the supports.

I have seen flutter in the wind tunnel and in flight test. It appears you are experiencing limit cycle flutter where the damping, aerodynamic and structural, is sufficient to prevent divergence. Once the damping line is crossed catastrophic failure is just a few cycles away. I agree with Fast Eddie. Do not fly until you figure out the problem and get it fixed.

I am new to the CT community having just bought a 2008 CTLS. My previous airplane was a Remos GX and I strongly disagree with these comments about the Remos. Never had a problem with the trim stability and I actually liked the light controls. The CT controls with the centering springs are much heavier than those on the Remos. Not bad but just different.