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Chris,

Thanks for the response.  <<If you see rotational movement about the hinge axis, that is a different animal-flutter.  If the entire aileron is moving up and down with no rotation-the mass balancing is doing its job. This vertical vibration with an unbalanced surface could easily lead to flutter as it would lead to rotation about the hinge and aerodynamic coupling.>>

How do I detect or see this 'rotational movement'?  All I see is the aileron vibrating up and down at a frequency that changes with airspeed and/or engine setting.   Another observation: I can feel the vibration on the control stick and even if I held the stick really tight, I am unable to arrest the vibration.

Anyway,  until I fly N360ZR again, I'm still not sure if the vibration I am experiencing with the left aileron is aerodynamically induced or engine/prop vibration induced.  I hope to test my modifications this afternoon and will report on the results on this forum.  I guess if it doesn't work, I will go to the next step and balance the prop dynamically and install the new engine isolators I recently received from Lancair with the objective of reducing vibration coming from that area.  Rick Argente
N360ZR

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