Discussion
Fin effectiveness against flight condition.
| Condition | Fin effectiveness | Reason |
|---|---|---|
| Cruise, small sideslip | Full | Clean attached flow |
| Large sideslip | Falling | Fin approaching its stall |
| High angle of attack | Reduced | Blanketed by the wing and fuselage wake |
| Very large sideslip | Collapsed | Fin stalled, rudder lock possible |
Which two rows are addressed by a dorsal fin and a ventral fin respectively?
Answer: B
Correct answer: Large sideslip and high angle of attack
Each device answers a different row of the table. The dorsal fin addresses the falling effectiveness at large sideslip, where the fin is approaching its own stall, by shedding a vortex that keeps the flow attached well beyond the natural stall angle.
The ventral fin addresses the reduced effectiveness at high angle of attack, where the main fin is blanketed by the wing and fuselage wake; mounted below the fuselage, it remains in clean air. Neither is needed in cruise at small sideslip, where the fin already works at full effectiveness with attached flow.
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