Foldable wing and rotocraft and glider using the same

A foldable wing, comprising:

• a sliding rail, connected to a fuselage of an aircraft;
• a skin supporting rib;
• a skin;
• a wing supporting skeleton that includes:
• a plurality of horizontal beams,
• a plurality of longitudinal beams,
• a pair of wing front edge beams,
• a pair of wing trailing edge beams configured to:
• maintain planar and sectional shapes of the foldable wing, support the skin supporting rib and the skin, and sustain an aerodynamic load from the skin and a load of a fuselage,
• a plurality of fixture connectors,
• a plurality of sliding blocks, moveably connected to the sliding rail, the horizontal beams, and the longitudinal beams, and
• a plurality of triangles forming among the plurality of horizontal beams, the plurality of longitudinal beams, the pair of wing front edge beams, and the pair of wing trailing edge beams, wherein the pair of wing front edge beams and the pair of wing trailing edge beams form a largest triangle of the plurality of triangles;
• a wing movement unit configured to apply a force to the sliding blocks to move the sliding blocks along the sliding rail and change a shape and an area of the foldable wing to achieve folding and unfolding of the foldable wing,
• wherein the sliding rail is connected to the plurality of horizontal beams, the plurality of longitudinal beams, the pair of wing front edge beams, and the pair of wing trailing edge beams via the plurality of fixture connectors and the plurality of sliding blocks.