Hi Guys

We have in the old days been lucky regarding flutter with small aircraft and therefore relatife stiff control systems. As the aircraft got bigger flutter became a problem as the total stiffness of the structure goes down. To cure flutter you must mass balance and seal the control gap, and have a stiff servo-control surface link.

I think it is unfair to call an airframe defect when you are not willing to install the above. Flutter speed depends heavily on the stiffness of the structure. So a small change in the density of wood in the control surfaces can have a major impact on the flutter speed. Changes manufacturers cannot really predict.

So I say: Dont be lazy, seal airtight, mass balance and fly with confidence.

Airasj ( full scale flutter analyst)