Patent ID: 8186957

Claim:
A fan impeller for cooling the engine that propels a motor vehicle and comprising a hub ( 14 ) and blades ( 12 ) extending radially outward from the hub, the blades having a flattened airfoil profile cross section with a leading edge ( 24 ) and a trailing edge ( 26 ) between which a chord ( 28 ) is defined, characterized in that the blade ( 12 ) has a relative thickness (E rel ) that reaches its maximum value (E max ) in the first quarter of the length (L) of the cord ( 28 ) measured from the leading edge ( 24 ), the relative thickness being defined by the ratio between the thickness (E) of the blade ( 12 ) and the length (L) of the chord ( 28 ), and wherein the maximum value (E max ) is between 12% and 20%.