Discussion
Which derivative would a designer increase to raise the steady roll rate available at a given aileron deflection?
Answer: A
Steady roll rate is \( p_{ss} = L_{\delta a}\delta_a/(-L_p) \), so raising aileron effectiveness raises the rate while raising roll damping would lower it. Dihedral effect and directional stiffness govern the slow lateral modes and do not enter the steady roll balance at all. The relation also explains why large ailerons and a stiff wing go together: effectiveness is worth little if the wing twists enough to undo it at high dynamic pressure.
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