Discussion
Assertion (A): The tailplane must be sized to overcome the wing and fuselage contributions.
Reason (R): Both of those contributions are generally destabilising on a conventional layout.
Select the correct answer from the options below.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the mechanism. On a conventional layout the centre of gravity lies aft of the wing’s aerodynamic centre, so an increase in incidence produces a nose-up moment, and the fuselage adds a further destabilising moment of its own. The tailplane is the only surface working the other way, so it must be sized to overcome both and leave a net negative moment slope.
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