Discussion
A servo tab arrangement differs from a balance tab in that
Answer: A
In a servo tab system the control run ends at the tab, and the aerodynamic moment it generates deflects the main surface, which floats free. It gives very light forces on a large aeroplane without hydraulics, at the cost of poor response at low speed where the tab has little authority. A fixed tab is a ground-adjustable trim device. Hydraulic drive would make it a powered control. And the tab works at all speeds, better as dynamic pressure rises.
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