Discussion
Statement I: Underwing engines allow a lighter wing structure.
Statement II: The engine mass acts downward against the wing's upward bending in flight.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second explains the first. In flight the wing is bent upward by the lift it produces, and the engine's mass hanging beneath it acts downward at a long moment arm, opposing that bending.
The relief is substantial - a six-tonne engine at nine metres provides some 530 kN m at 1 g - and it scales with load factor, so it is greatest at the design manoeuvre and gust cases where the structure is critical. The result is a lighter wing than the same aircraft would need with rear-mounted engines.
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