Discussion
Which is a symptom of insufficient mass balance?
Answer: A
Flutter is the symptom: an unbalanced surface lags the structure's motion and feeds energy into it, producing an oscillation that grows with speed. Heavy forces are an aerodynamic balance question, addressed with set-back, horns or tabs. A shallow speed gradient is a static stability or downspring matter. Poor trim authority means the tab is too small or its travel too limited. Each symptom points to one class of device, which is the practical value of keeping the four apart.
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