Discussion
Assertion (A): Variable-sweep wings have largely fallen out of favour in new designs.
Reason (R): The pivot mechanism imposes a substantial weight and complexity penalty.
Select the correct answer from the options below.
Answer: B
Both are true and the second explains the first. The aerodynamic case for varying sweep is real, but the pivot is heavy, expensive and a maintenance burden, and modern high-lift devices and thrust-to-weight ratios have narrowed the benefit enough that fixed wings now usually win.
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