Discussion
The dorsal fin's main purpose is to
Answer: C
Correct answer: Delay fin stall at large sideslip angles
A dorsal fin is a low aspect ratio fillet extending the fin forward along the fuselage. Its swept leading edge sheds a stable vortex that keeps the flow attached to the fin well beyond its natural stall angle.
That preserves directional stability in a large sideslip and prevents rudder lock, where a stalled fin reverses the rudder's hinge moment and the surface floats hard over. It contributes little at small sideslip, where the fin is unstalled and working normally, so it is not a way of adding area for cruise stability.
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