Discussion
The fuselage of a conventional aeroplane contributes
Answer: C
Correct answer: A destabilising pitching moment
A slender body inclined to a flow develops a moment that acts to increase its incidence - the classical Munk result for a body of revolution. The fuselage therefore adds a positive term to \( \mathrm{d}C_m/\mathrm{d}C_L \) at every speed, typically of the order of \( +0.03 \) to \( +0.05 \). It is one of the two destabilising contributions the tailplane must overcome, and it is why a long forward fuselage tends to require a larger tail.
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