What additional structures does a semi-cantilever wing require?

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A semi-cantilever wing design requires additional external support structures primarily because it does not have the full structural integrity of a fully cantilevered wing. In a semi-cantilever wing, part of the wing structure is supported by external struts or supports, typically connecting the wing to the fuselage or other parts of the aircraft to maintain stability and structural integrity.

These external structures help distribute aerodynamic loads and provide the necessary support to prevent excessive bending or failure during flight. The design allows for lighter wing constructions while still providing the required strength and rigidity, which is essential for aircraft performance and safety.

In contrast, the other options relate to different structural characteristics that do not specifically apply to semi-cantilever wings. Internal wing stubs refer to a different method of wing reinforcement, reinforced wing tips are associated with strength at the extremities of the wing rather than the overall support structure, and heavy fuselage supports would imply an entirely different design approach where the fuselage itself must contribute heavily to structural integrity, which is not typical in semi-cantilever designs.

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