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In flight, a cantilever wing of an aeroplane containing fuel is subjected to vertical loads that produce a bending moment that is:

  • A

    lowest at the wing root.

  • B

    equal to the zero-fuel weight multiplied by the span.

  • C

    equal to half the weight of the aeroplane multiplied by the semi-span.

  • D

    highest at the wing root.

Refer to figure.

Cantilever Wing: Uses no external struts or bracing. All support is obtained from the wing itself. The wing spars are built in such a way that they carry all the torsion and bending loads. The end fixed rigidly to the central fuselage is known as the root and the far end as the tip.

  • In flight lift, lift is pulling the wings up (bent upwards), stretching the bottom (tension) and compressing the top => Cantilever Wings are attached to the fuselage on one end (root), and therefore they do not bend at this end. However, wing tips are free to move and, as a resulf of lift, bend upwards. Upward bending force combined with the wing legth results in a high bending moment and stress is created at the root.

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