Discussion
Assertion (A): Ventral fins are fitted to aeroplanes expected to reach very high angles of attack.
Reason (R): The main fin can be blanketed by the wake of the wing and fuselage.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. At very high angle of attack the wing and fuselage shed a broad low-energy wake, and a conventional centreline fin sits within it, losing much of its effectiveness just where directional control matters most.
A ventral fin mounted below the fuselage remains in clean air at those attitudes, so its contribution holds up as the main fin's falls away. That is why the device appears on aeroplanes expected to reach extreme incidence - fighters, and types cleared for spinning - rather than on transports that never go there.
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