Patent ID: 8871126

Claim:
A method for producing an object of composite material, the method comprising: providing a curved molding tool having a curved spar rib surface forming corners at opposite sides thereof with a concave flange surface and a convex flange surface, each corner having a curvature matching that of the spar rib surface, and the concave and convex flange surfaces each having a curvature matching that of its respective corner with the spar rib surface; forming a fiber stack of a plurality of fiber prepregs over the spar rib surface so that the fiber stack folds over each of said corners, wherein no fiber directions of the fiber stack are parallel with curvature of the molding tool, and wherein all fibers of the fiber stack cross each of said corners only once; downforming the fiber stack by activation of a vacuum bag applying pressure causing the fiber stack to conform to the molding tool; and curing the downformed fiber stack.