Spar (aviation)

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In an aircraft, the spar is the main structural member of the wing, running lengthways across the span of the wing, at right angles (or thereabouts) to the fuselage. The spar carries all of the forces of both lift, and the weight of the wings on the ground. Other structural and forming members such as ribs may be attached to the spar or spars. There may be more than one spar in a wing, though in general one carries the majority of the forces on it, and is called the main spar.