Discussion
Assertion (A): A dorsal fin prevents rudder lock.
Reason (R): Rudder lock follows a fin stall that reverses the hinge moment.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true, and the reason identifies exactly the mechanism the dorsal fin interrupts. Rudder lock begins with the fin stalling at large sideslip; the separated flow reverses the rudder's hinge moment, so the surface floats hard over instead of tending to centre.
A dorsal fin prevents this by preventing the stall - its swept, low aspect ratio leading edge sheds a vortex that keeps the fin's flow attached to a far larger sideslip angle. Because it removes the cause rather than treating the symptom, it cures the loss of directional stability at large sideslip in the same stroke.
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