Patent ID: 7104501
Filing Date: 2006-09-12
Classification: B23H,B64C

Abstract:
1. A blade member for an airplane, which constitutes at least a portion of a rotor blade of the airplane, said blade member comprising: an outer skin area surrounded by a first outer skin, a second outer skin, a leading edge and a trailing edge each having a predetermined wall thickness; and at least one reinforcing area extending in a span direction within the outer skin area and connected to the first outer skin and the second outer skin, wherein said outer skin area including said first outer skin, said second outer skin, said leading edge and said trailing edge and said reinforcing area are integrally formed from a single block by wire electrical discharge-machining, and wherein the wall thickness of the first outer skin includes a central portion that is thicker relative to a portion adjacent to the leading edge and a portion adjacent to the trailing edge, wherein two reinforcing areas are provided within the outer skin area for connecting the first outer skin to the second outer skin, wherein the at least one of wall thicknesses of said first outer skin and said second outer skin changes in a cord direction between a first of said two reinforcing areas and a second of said two reinforcing areas, with a portion the wall thickness of said first outer skin adjacent to the first of said two reinforcing area being thicker than a portion the wall thickness of said first outer skin adjacent to the second of the two reinforcing area.