Aerofoil structure for a gas turbine engine

An aerofoil structure for a gas turbine engine, the aerofoil structure comprising:

• an aerofoil portion and a tip portion, the tip portion comprising a tip surface configured to face a corresponding seal segment of the gas turbine engine and a plurality of cutting features provided on at least a portion of the tip surface, wherein the cutting features are discrete and spaced apart from each other, the tip surface defining a longitudinal axis along a length of the tip surface and a transverse axis perpendicular to the longitudinal axis, each cutting feature from the plurality of cutting features extending from the tip surface and being configured to cut into the seal segment in a cutting direction parallel to the longitudinal axis upon rotation of the aerofoil structure relative to the seal segment, wherein a minimum longitudinal distance between a pair of adjacent cutting features from the plurality of cutting features along the longitudinal axis is at least 100 microns, wherein each cutting feature defines a maximum height from and perpendicular to the tip surface, and wherein the maximum height is from 75 microns to 250 microns, and wherein at least two cutting features from the plurality of cutting features have different maximum heights from the tip surface.