Patent ID: 7264444

Claim:
An aerofoil having a cambered body for generating lift, the cambered body extending longitudinally and defining in lateral cross section an upper curved surface and a lower surface, and wherein said upper and lower surfaces meet at a leading edge and a trailing edge, and at least one flow control device, the flow control device including a passage within the cambered body, and a passage outlet at the upper curved surface of the cambered body, whereby in use, air from the passage passes through the passage outlet to affect airflow over the upper curved surface of the cambered body over at least a range of incidence angles of the leading edge, wherein the passage outlet is formed by an outlet fitting which is secured relative to the upper curved surface of the cambered body, wherein the outlet fitting includes an uppermost fitting surface which lies contiguously with the surrounding upper curved surface so that there is no or only a minimal discontinuity at a surface interface of the uppermost fitting surface and the surrounding upper curved surface, and wherein the uppermost fitting surface further includes an opening which communicates with the passage within the cambered body.