Patent ID: 7607617

Claim:
A wing unit, in particular a spar box, for forming an aerodynamically active surface of an aircraft, in particular airfoils, horizontal tail units, or rudder units of a plane, comprising: an upper shell and a lower shell, the upper shell and the lower shell forming the aerodynamically active surface; at least two ribs; at least two actuating members; and at least two spars; wherein in a region between the upper shell and the lower shell the at least two actuating members are arranged for modifying the surface geometry of the aerodynamically active surface or the mechanical properties of the wing unit, or both the surface geometry of the aerodynamically active surface and the mechanical properties of the wing unit; wherein between the at least two ribs, the at least two actuating members are arranged crosswise for forming a tension shear; and wherein the at least two actuating members are arranged substantially in parallel to the at least two spars.