Discussion
A wing carries a lift of \( 400 \) kN with its centre of pressure \( 4.5 \) m from the root. The root bending moment is
Answer: C
Correct answer: 1800 kN m
\[ M = F \times d = 400 \times 4.5 = 1800\ \mathrm{kN\,m}. \] The centre of pressure is the point through which the resultant lift acts, so the moment about the root is simply that force times its distance. This is the load case that sizes the wing: the bending moment is greatest at the root and falls to zero at the tip, which is why spar caps taper outboard.
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