Discussion
Control surface flutter is a coupling between
Answer: D
Flutter of this kind couples wing or tail motion with the surface's own inertia about its hinge: as the structure bends, an unbalanced surface lags behind, its deflection feeds energy into the motion, and the oscillation grows. Mass balance breaks the loop by moving the surface centre of gravity to the hinge. Pilot coupling is a pilot-induced oscillation, a distinct phenomenon at much lower frequency. Engine vibration and tab settings are not flutter mechanisms.
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