Discussion
Aileron effectiveness in the derivative set appears as
Answer: B
It is \( C_{l_{\delta a}} \), a rolling moment per unit deflection, one of the control derivatives rather than a stability derivative, since its independent variable is a control input and not a motion variable. Rolling moment per unit roll rate is roll damping, and the ratio of the two sets the steady roll rate. Yawing moment per unit sideslip is directional stiffness. Side force per unit rudder deflection is a rudder control derivative, useful for sideslip control and for engine-out trim.
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