Discussion
Match each surface in List I with its purpose in List II.
List I
A. Dorsal fin
B. Ventral fin
C. Rudder
D. Twin fins
List II
1. Maintains stability at large sideslip
2. Adds stability at high angle of attack
3. Provides directional control
4. Place the surfaces in cleaner air and reduce height
Select the correct match.
Answer: C
Correct answer: A-1, B-2, C-3, D-4
Three of the four are fixed surfaces and one is a control. The dorsal fin maintains stability at large sideslip by delaying the fin stall; the ventral fin adds stability at high angle of attack by working below the wake; twin fins are placed outboard in cleaner air and reduce overall height.
The rudder alone is movable, and it provides directional control rather than stability. Keeping the two functions apart matters because they are sized by different criteria - stability by the yawing moment derivative, control by the largest moment that must be balanced.
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