Discussion
Rudder lock is a condition in which
Answer: D
At large sideslip the fin can stall, its restoring moment collapses, and the rudder's own hinge moment drives it to the stops and holds it there, so the sideslip is sustained rather than corrected. A dorsal fin is the classic cure, keeping the flow attached to much larger angles. It is not a mechanical jam, and not damper saturation, which is an augmentation limit rather than an aerodynamic one. Loss of rudder effectiveness at speed is a separate compressibility or aeroelastic question.
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