Discussion
A twin fin arrangement is sometimes used to
Answer: D
Correct answer: Place fins in cleaner air, reduce height
Two fins set outboard on the tailplane can be positioned clear of the wake shed by the wing and fuselage at high angle of attack, keeping their effectiveness where a single centreline fin would be blanketed. Splitting the area also halves the height needed for a given fin area, which matters for hangar clearance and for carrier operation.
They also sit in the propeller or jet efflux on some layouts, which raises local dynamic pressure further. The arrangement neither removes the need for rudders - both fins carry them - nor eliminates sideslip, which is a flight condition rather than a design feature.
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