Sheet metal fan
 A sheet metal fan blade of improved performance and efficiency has a varying camber angle and chord angle along radial positions of the blade, such that the angle of attack along at least 70% of the length of the blade is not less than 2.degree. or more than 10.degree.. The fan blade construction exhibits utility in an automotive radiator cooling system. 
Wallace Murray Corporation
Y F
Y10S F04D
additional inventional
Clifford Sau Leong Cheng-Chien
Yee Chou