Rib (aircraft)
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In an aircraft, ribs are forming elements of the structure of a wing, especially in traditional construction.
By analogy with the anatomical definition of "rib", the ribs attach to the main spar, and by being repeated at frequent intervals, form a skeletal shape for the wing. Usually ribs incorporate the airfoil shape of the wing, and the skin adopts this shape when stretched over the ribs.
Ribs are made out of wood, metal, plastic, composites, foam. The wings of kites[1], hang gliders [2], paragliders [3], powered kites [4], powered hang gliders , ultralights, windmills [5] are aircraft that have versions that use ribs to form the wing shape.