Discussion
The hinge moment of a control surface is
Answer: A
It is the aerodynamic moment about the hinge line itself, and it is what the pilot must overcome through the control run, so it sets the stick or pedal force. The moment about the centre of gravity is the control effectiveness, a quite different quantity: a surface can be very effective and still light to move, which is exactly the combination designers seek. The bracket loads are a structural matter. Trim is a whole aeroplane balance rather than a hinge quantity.
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