Discussion
Match each aeroelastic phenomenon in List I with its cause in List II.
List I
A. Torsional divergence
B. Aileron reversal
C. Flutter
D. Control surface buzz
List II
1. Aileron deflection twisting the wing against itself
2. Self-reinforcing twist above a critical speed
3. Shock-induced oscillation of a control surface
4. Coupling of bending and torsion modes with the airflow
Select the correct match.
Answer: B
Correct answer: A-2, B-1, C-4, D-3
Four distinct phenomena. Divergence is a static instability in which aerodynamic twist reinforces itself above a critical speed; aileron reversal is the aileron twisting the wing so far against itself that the roll response inverts; flutter is a dynamic coupling of bending and torsion modes with the airflow; and buzz is a shock-induced oscillation of a control surface. The first two are direct consequences of torsional flexibility.
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