Ceiling fan

Abstract

A ceiling fan comprising a motor system. The motor system is mounted around a motor shaft. The motor shaft couples to a downrod for suspending the ceiling fan from a structure. The motor shaft and motor are encased by a motor housing. The motor housing comprises hub arms for mounting a plurality of blade holders. The blade holders coupled to a plurality of blades rotatable about the motor during operation.

What is claimed is: 
     
         1 . A ceiling fan assembly comprising:
 a motor assembly having a rotating blade hub; and   at least one fan blade mounted to the rotating blade hub having a blade span defined between a tip and a root, and having an airfoil cross section including a leading edge and a trailing edge defining a chord line extending therebetween, with the at least one fan blade comprising a pressure side surface and a suction side surface extending between the leading edge and trailing edge, wherein the pressure side surface has a first portion that bends inwardly toward a blade centerline and the pressure side surface never crosses the chord line.   
     
     
         2 . The ceiling fan assembly of  claim 1  wherein the leading edge is rounded and the trailing edge is v-shaped. 
     
     
         3 . The ceiling fan assembly of  claim 1  wherein the pressure side surface comprises a second portion that bends away from the blade centerline. 
     
     
         4 . The ceiling fan assembly of  claim 3  wherein the second portion is closer to the leading edge than the first portion. 
     
     
         5 . The ceiling fan assembly of  claim 4  wherein the second portion transitions to the first portion. 
     
     
         6 . The ceiling fan assembly of  claim 5  wherein the second portion begins at the leading edge. 
     
     
         7 . The ceiling fan assembly of  claim 6  wherein the first portion ends at the trailing edge. 
     
     
         8 . The ceiling fan assembly of  claim 3  wherein the second portion is convex and the first portion is concave. 
     
     
         9 . The ceiling fan assembly of  claim 1  wherein the chord line is between 6 and 8 inches and the blade span is between 6 and 12 feet. 
     
     
         10 . The ceiling fan assembly of  claim 9  wherein a rotational speed of the at least one blade is between 60 and 80 rpm. 
     
     
         11 . The ceiling fan assembly of  claim 9  wherein the chord line is 7 inches and the blade span of the at least one blade is about 12 feet. 
     
     
         12 . The ceiling fan assembly of  claim 11  wherein a rotational speed of the ceiling fan assembly is about 67 rpm. 
     
     
         13 . The ceiling fan assembly of  claim 1  wherein the pressure side surface and the suction side surface provide lift to the at least one blade for improving efficiency of the at least one blade. 
     
     
         14 . The ceiling fan assembly of  claim 1  wherein the chord line is between 6 and 8 inches. 
     
     
         15 . The ceiling fan assembly of  claim 14  wherein the chord line is about 7 inches. 
     
     
         16 . The ceiling fan assembly of  claim 1  wherein the blade span of the at least one blade is between 6 and 12 feet. 
     
     
         17 . The ceiling fan assembly of  claim 16  wherein the span is 9 feet. 
     
     
         18 . The ceiling fan assembly of  claim 1  wherein the blade has a non-symmetrical cross section. 
     
     
         19 . The ceiling fan assembly of  claim 1  wherein the blade has a cross-section with a maximum thickness of 1 inch. 
     
     
         20 . The ceiling fan assembly of  claim 1  wherein the at least one blade is hollow defining a chamber.