Compressor blade

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 to the at least one internal chamber in the aerofoil, the dimensions, shape and position of the at least one aperture are selected such that the root is deformable wherein there are a plurality of apertures extending from the base of the root to the at least one chamber.

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 to the at least one internal chamber in the aerofoil, the dimensions, shape and position of the at least one aperture are selected such that the root is deformable wherein the maximum dimension of the aperture is limited by the maximum dimension of the at least one internal chamber in the aerofoil.

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 to the at least one internal chamber in the aerofoil, the dimensions, shape and position of the at least one aperture are selected such that the root is deformable wherein the at least one chamber is at least partially filled with a vibration damping material.

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 to the at least one internal chamber in the aerofoil, the dimensions, shape and position of the at least one aperture are selected such that the root is deformable wherein the dimension of the at least one aperture in the direction between the sides of the base is between 8 mm and 14 mm, the base has sides and ends, the dimension between the sides is about 18 mm.

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, the base having sides and ends, the root having at least one aperture extending from the base to the at least one internal chamber in the aerofoil, the dimensions, shape and position of the at least one aperture are selected such that the root is deformable, the at least one aperture is provided with a seal and the dimensions of the at least one aperture is between 40% and 80% of the dimension between the sides of the base.

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 thetrailing 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 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 fan blade comprises two or more sheets and the sheets are diffusion bonded together wherein the at least one aperture comprises a channel in the centre sheet.