Patent ID: 7927071
Filing Date: 2011-04-19
Classification: F04D

Abstract:
1. A method of operating efficient traditionally appearing ceiling fan blades with aerodynamical upper surfaces ceiling fan, comprising the steps of: providing ceiling fan blades having a flat and planar lower surfaces that visually appear to be flat and planar when viewed underneath, the flat and planar lower surfaces having a leading edge and a trailing edge; providing aerodynamic members having aerodynamic upper surfaces, the aerodynamic upper surfaces having an upwardly curving slope from a leading edge to a point of maximum thickness that is closer to the leading edge than to a trailing edge, the aerodynamic upper surfaces having a downwardly curving slope from the maximum thickness point to the trailing edge, each of the aerodynamic upper surfaces having a mid-thickness along a longitudinal axis of the separate members being thicker than both thicknesses along the leading edge and the trailing edge of the aerodynamic members; forming the aerodynamic members on upper surfaces of the ceiling fan blades, so the leading edge of the aerodynamic members is directly formed the leading edge of the flat and planar lower surfaces of the ceiling fan blades, and the trailing edge of the aerodynamic members is directly formed on the trailing edge of the flat and planar lower surfaces of the ceiling fan blades; attaching the ceiling fan blades with the aerodynamic members to a ceiling fan motor; rotating the ceiling fan blades with the aerodynamic members relative to the motor; and generating a CFM (cubic feet per minute) airflow of at least five (5) percent (%) greater than and provide increased airflow over ceiling fan blades that have both upper and lower flat and planar surfaces.