Discussion
The main drawback of a servo tab system at low speed is
Answer: D
Because the tab must generate an aerodynamic moment to move the main surface, its authority falls with dynamic pressure and the response is poor at low speed - exactly where a large aeroplane needs crisp control, on approach and in the flare. Stick forces are light, which is the system's virtue. Flutter is managed by balance as on any surface. Trim remains available through a separate tab or through the tab's own datum.
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