Discussion
Which is true of the relationship between control effectiveness and hinge moment?
Answer: A
The whole art of manual control design rests on the fact that they are separable: aerodynamic balance changes the moment about the hinge while leaving the moment about the aeroplane's centre of gravity nearly untouched. If they were strictly proportional, no such device could work. Reducing area reduces both, but that is one particular change rather than a general rule. And it is hinge moment, not effectiveness, that depends strongly on hinge position. The practical test is to ask which quantity a change would move: the force, the gradient, the flutter margin or the trim.
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