Discussion
Assertion (A): Load introduction at the wing-body joint requires heavy local structure.
Reason (R): Very large concentrated loads must be diffused into a shell only millimetres thick.
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 are true and the reason is the mechanism. The wing delivers its entire bending moment, shear and torque into the fuselage at a handful of attachment points, and that concentrated load must be spread into a shell of two or three millimetres without overstressing it locally. Diffusing it needs heavy machined fittings, thick doublers and closely spaced frames - which is why the centre section is among the heaviest parts of the aircraft per unit volume.
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