In an aircraft
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 placed 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... Read More