A method for making an airfoil blade comprising: extruding an aluminum member with an upper skin, a lower skin, a nose section and a tail section, with at least one hollow bore defined by said upper skin, lower skin, nose section and tail section forming a first longitudinal, extruded groove with a first narrowed, open, longitudinally extending mouth in said nose section as said member is extruded forming a second longitudinal, extruded groove with a second narrowed, open, longitudinally extending mouth in said nose section as said member is extruded slicing said member to length to form individual blades.ġ1. A blower wheel according to claim 8 wherein said second longitudinally extending mouth comprises an arc of about 55° to about 65° about a longitudinal axis of said second longitudinal, extruded groove.ġ0.
![aluminum airfoil extrusion aluminum airfoil extrusion](https://www.wellste.com/wp-content/uploads/2021/03/Aluminum-Airfoil-Extrusion-2.jpg)
A blower wheel according to claim 5 wherein said first longitudinally extending mouth comprises an arc of about 55° to 65° about a longitudinal axis of said first longitudinal, extruded groove.ĩ. A blower wheel according to claim 5 wherein said blades are secured to said front support and said back support with thread cutting or thread forming screws extending through said front support into said grooves and additional thread cutting or thread forming screws extending through said back support into said grooves.Ĩ.
![aluminum airfoil extrusion aluminum airfoil extrusion](https://www.aircraftspruce.com/catalog/graphics/3/03-00238.jpg)
A blade according to claim 5 wherein said first extruded groove faces toward said tail section and said second extruded groove faces toward said nose section.ħ.
ALUMINUM AIRFOIL EXTRUSION SKIN
A centrifugal blower wheel comprising: a rear blade support a front blade support and a series of extruded airfoil blades spaced between said rear blade support and said front blade support, said blades comprising: hollow extrusions having an upper skin with a thickness and a lower skin with a thickness each of said skins extending from a nose section to a tail section said nose section having a thickness greater than the thickness of said upper skin and greater than the thickness of said lower skin said nose section comprising a first longitudinal, extruded groove with a first narrowed, open, longitudinally extending mouth said tail section having a thickness greater than the thickness of said upper skin and greater than the thickness of said lower skin said tail section comprising a second longitudinal, extruded groove with a second narrowed, open, longitudinally extending mouth and said first and second grooves and said first and second mouths being designed and adapted to retain fasteners within said grooves, and being designed to facilitate forming of said grooves and said mouths during extrusion of said blades.Ħ. A blade according to claim 3 wherein said aluminum comprises alloy 6061T6 or alloy 6061T6.ĥ. A blade according to claim 1 wherein said extrusion comprises aluminum.Ĥ. A blade according to claim 1 wherein said first extruded groove faces toward said tail section and said second extruded groove faces toward said nose section.ģ.
![aluminum airfoil extrusion aluminum airfoil extrusion](https://www.duckworksmagazine.com/15/howto/windknife/wkn4.gif)
A fan blade comprising: a hollow extrusion having an upper skin with a thickness and a lower skin with a thickness each of said skins extending from a nose section to a tail section said nose section having a thickness greater than the thickness of said upper skin and greater than the thickness of said lower skin said nose section comprising a first longitudinal, extruded groove with a first narrowed open, longitudinally extending mouth said tail section having a thickness greater than the thickness of said upper skin and greater than the thickness of said lower skin said tail section comprising a second longitudinal, extruded groove with a second narrowed open, longitudinally extending mouth and said first and second grooves and said first and second mouths being designed and adapted to retain fasteners within said grooves, and being designed to facilitate forming of said grooves and said mouths during extrusion of said blade.Ģ.