AIRCRAFT WING BOX WING COMPOSITE FRONT SPAR Russian patent published in 2025 - IPC B64C3/18 

FIELD: aviation.

SUBSTANCE: invention relates to aircraft engineering. Composite front spar of the aircraft wing box is made in the form of a beam from polymer composite material based on carbon fibre. Spar includes wall (5) with upper (3) and lower (4) belts turned inside the wing box and joined by means of titanium fitting (6) in the fracture zone. Laying of polymer composite material includes from 1 to N packages consisting of 1 to n layers with laying angles of 0°/±45/90° with percentage of layers in laying: 9.1% in 0° direction, 72.7% in the ±45° directions, 18.2% in 90° direction. In each section along the chord, the spar in the wall and belts has the same direction of laying of layers of the polymer composite material. Thickness of spar walls and belts varies in length.

EFFECT: reduction of total weight of the entire structure of the wing box of the aircraft with provision of the required values of specific strength and specific rigidity of the structure of the box.

4 cl, 2 dwg