Discussion
Assertion (A): The fin must be sized to overcome the fuselage and any tractor propeller.
Reason (R): Both contribute side force ahead of the centre of gravity and are destabilising.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the second is the reason for the first. The fuselage carries most of its side area ahead of the centre of gravity, and a tractor propeller's side force in sideslip acts at the disc, also ahead of it.
A side force forward of the centre of gravity produces a moment that increases sideslip, so both are destabilising and the fin must be large enough to overcome their sum and still leave \( C_{n\beta} \) positive. That surplus is the stability margin. It is why fin sizing begins with the negative contributions rather than with the fin itself.
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