Discussion
Consider the following pairs of derivative and the surface that dominates it.
Pitching moment with elevator - Horizontal tail
Yawing moment with rudder - Vertical tail
Rolling moment with aileron - Wing
Side force with sideslip - Horizontal tail
How many of the pairs given above are correctly matched?
Answer: C
The first three are right and the fourth is not, so three pairs match. Side force with sideslip comes from the vertical tail and the fuselage side area, not from the horizontal tail, whose contribution to a side force is negligible. Each control derivative belongs to the surface that carries the control, which is the easiest of the attributions, and the force derivatives follow the area presented to the relevant flow direction.
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