Discussion
The side force derivative with rudder deflection is used mainly in analysing
Answer: B
Rudder side force matters for balancing an asymmetric thrust condition and for steady sideslip manoeuvres, both of which are trim problems rather than modal ones, and it feeds directly into the minimum control speed calculation. The short period is longitudinal. Roll performance depends on aileron effectiveness against roll damping. Longitudinal trim with speed involves the elevator and the speed derivatives, not the rudder.
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