Discussion
Assertion (A): Semi-monocoque construction is lighter than a true monocoque of the same strength.
Reason (R): Adding stringers shortens the unsupported length of the skin, so a thinner skin may be used.
Select the correct answer from the options below.
Answer: B
Both are true and the second explains the first. Buckling, not material strength, sets the skin thickness in a shell, and dividing the panels with stiffeners raises the buckling stress sharply. The stringers add weight but the skin saves far more.
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