Patent ID: 7118346
Filing Date: 2006-10-10
Classification: F01D,F04D,Y10S

Abstract:
1. A fan blade comprising an aerofoil and a root, the aerofoil comprising a concave wall extending from a leading edge to a trailing edge and a convex wall extending from the leading edge to the trailing edge, the aerofoil defining at least one internal chamber, the root being connected to the aerofoil, the root having a base remote from the aerofoil and at least one aperture extending from the base of said root to the at least one internal chamber in the aerofoil wherein the base has sides and ends, the dimensions of the at least one aperture is between 40% and 80% of the dimension between the sides of the base such that the root is deformable and the ends of the base are adjacent to the leading edge and trailing edge of the aerofoil, the sides of the base being adjacent the concave wall and convex wall of the aerofoil wherein the at least one aperture is provided with a seal.