Rib (aircraft) 1267430 221284288 2008-06-23T21:15:32Z 145.94.75.47 /* Type of ribs */ 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. ==Type of ribs== There are several types of '''ribs'''. Form-ribs, plate-type ribs, truss ribs, closed-ribs, forged ribs and milled ribs, where form-ribs are used for light to medium loading and milled ribs are as strong as it can get. <br />Form-ribs are made from a sheet of metal bent into shape, such as a U-profile. This profile is place on the skin, just like a [[stringer]], but then in the other direction. <br />Plate-type ribs consist of sheet-metal, which has upturned edges and (often has) weight-saving holes cut into it. <br />Truss ribs are built up out of profiles that are joined together. These joints require great attention during design and manufacture. The ribs may be light or heavy in design which make them suitable for a wide range of loads. <br />Closed-ribs are constructed from profiles and sheet metal and are suitable for closing off sections of the wing (e.g.: the fuel tank). Here too, particular care must be taken with the joints and this type of rib is also suitable for application in a variety of loading conditions. <br />[[Forged]] ribs are manufactured using heavy press-machinery. The result is fairly rough; for more refined parts, high-pressure presses are required, which are very expensive. Forged pieces (usually) have to undergo further treatment (for smoother edges and holes). Forged ribs are used for sections where very high loads apply - near the undercarriage for example. <br />[[Milled]] ribs are solid structures. They are manufactured by milling away excess material from a solid block of metal (usually using computer-controlled milling machines). The shape of these ribs is always accurately defined. Such ribs are used under similar conditions as those for forged ribs. Ribs are made out of wood, metal, plastic, composites, foam. The wings of [[kite]]s<ref>[http://www.google.com/patents?id=xGV9AAAAEBAJ Ribs in kite]</ref>, [[hang glider]]s <ref>[http://aero.stanford.edu/Reports/SWIFTArticle1991.html Swift Development]</ref>, [[paraglider]]s <ref>[http://www.vertigo-inc.com/aiaa/ Parafoil ribs]</ref>, powered kites <ref>[http://www.poweredparasports.com/PPG%20Glossary.htm Powered Paraglider glossary. Ribs.]</ref>, [[powered hang glider]]s , [[Ultralight aviation|ultralights]], windmills <ref>[http://www.google.com/patents?id=svw6AAAAEBAJ Windmill with ribs in its wings]</ref> are aircraft that have versions that use ribs to form the wing shape. ==References== {{Reflist}} [[Category:Aircraft components]] [[Category:Aeronautics]] {{component-aircraft-stub}}