Re: Dubbi

Inviato da  Tuttle il 14/11/2006 19:17:51

Aircraft wings have two main structural components beneath their aluminum skin. Spars are ultra-rigid metal beams that support a series of ribs that give shape to the wing. The main spar, a piece of solid aluminum alloy, has the same approximate shape as the floor beam of a house, being perhaps 10 cm thick and less than a metre high at the center of the aircraft. The main spar runs out almost to the end of both wings and therefore varies in height with the thickness of the wing. Two other spars, one aft of the leading edge (the forward spar) and one aft of the main spar (the aft spar) complete the main structural support of the wings.




Schematic of wing structure of a Boeing 757 (above)
and structual details of aircraft (below)

The figure above shows a schematic view of a large passenger aircraft wing. Three spars give the wing rigidity and structural strength: a leading edge spar, a main spar, and a trailing edge spar. The main spar of the Boeing 757 can be seen in the lower image, where a cutaway behind the port (lower in diagram) engine clearly reveals the masive main spar.

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