AIRCRAFT MAINFRAME MADE FROM COMPOSITE MATERIAL Russian patent published in 2012 - IPC B64C1/06 

FIELD: transport.

SUBSTANCE: invention covers versions of aircraft main frame implementations. Mainframe is made from composite material and comprises two side elements and basic element. Side elements are jointed together on mainframe inner part by said basic element. Every said side element comprises rim jointing frame with aircraft fuselage skin, wall 5 and inner flange 6 jointing wall 5 and basic element together. Mainframe and skin make torsion box structure while wall forms angle of, at least, 90° with said rim. In compliance with first version, side elements and basic element feature variable thickness and cross-section. In compliance with second version, mainframe may incorporate fitting 8 jointed with wall.

EFFECT: reduced weight.

12 cl, 16 dwg