Discussion
Setting the hinge line back from the leading edge of the surface
Answer: D
Moving the hinge aft puts part of the surface ahead of it, so the load on that forward portion produces a moment opposing the rest and reduces \( C_{h_\delta} \). It is the simplest and most common form of aerodynamic balance. Effectiveness about the aeroplane's centre of gravity is essentially unchanged, which is the point: lighter forces for the same control power. Flutter needs mass balance. Trim tabs remain necessary for trimming. Each of these is measured differently and adjusted by a different means, which is why they are specified separately.
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