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Plastic-composite profiled girder, in particular a wing spar for aircraft and for wind-turbine rotors Patent #: 5476704
ApplicationNo. 363396 filed on 07/29/1999
US Classes:244/133, Materials of construction416/226, Formed with main spar416/230Wire, fiber, strand or fabric
ExaminersPrimary: Barefoot, Galen L.
Attorney, Agent or Firm
International ClassB64C 003/20
Foreign Application Priority Data1998-07-30 JP
AbstractA box-structure airfoil is constructed of a composite material upper skin, a composite material lower skin 12 and a spar. Ribs and an elongate projection are formed integrally on the inner surface of each of the two skins. The upper and lower skins and the spar are simultaneously bonded by an adhesive to form a single structure. Since the ribs and the elongate projection are one-piece formed with each skin, it is possible to reduce the number of principal constituent components. Furthermore, since assembly operation is made by using the adhesive, there is no need for fasteners or the like for assembling. Moreover, the spar is bonded not only to Moreover, because not only a web but also flanges on both sides of the spar are bonded to the respective skins, it is possible to obtain a large strength. According to the invention, it is possible to reduce the number of principal constituent components and that of assembling components of an airfoil, thereby achieving its cost reduction.