Yeah that makes far more sense.

I noticed that when I first tested the Ultimate 40S' (both the WM and the NP ones) that the aileron linkages would get a strong harmonic vibration at particular RPM ranges. It would cause a 'wizzing' sound in flight but it was not the destructive flutter always talked about.

I then replaced the servo with a higher torque one and use longer control horns with stiffer linkage wires and the problem went away for the most part.

Even now the linkage wires make a not unpleasant singing noise as the plane goes by.

But I've run this sucker full throttle nose down from high altitudes and never had real flutter.

On one plane I put the linkage wires inside thin fuel tubing to stop the harmonic vibration, borrowing a trick from the heli guys. This worked.