Discussion
Consider the following statements about fixed surfaces:
1. A dorsal fin maintains stability at large sideslip.
2. A ventral fin helps at high angle of attack.
3. Both increase the rudder's control power.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1 and 2 only
The first two are correct. A dorsal fin maintains stability at large sideslip by delaying the fin stall, and a ventral fin helps at high angle of attack by remaining clear of the wing and fuselage wake.
The third confuses stability with control. Both are fixed surfaces carrying no movable element, so neither adds any control power; they change the yawing moment produced by sideslip, not the moment produced by a pilot input. Rudder power is increased by enlarging the rudder or its moment arm, which is a separate design decision sized by a separate criterion.
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