Patent ID: 8721305

Claim:
A fan, comprising: (a) a hub, wherein the hub is rotatable about an axis, wherein the hub comprises a plurality of mounting tabs extending outwardly relative to the axis, wherein each mounting tab of the plurality of mounting tabs has a leading edge and a trailing edge; (b) a plurality of fan blades, wherein each fan blade of the plurality of fan blades has a hollow interior, wherein the hollow interior of each fan blade is defined by at least one interior surface, wherein each mounting tab of the hub is inserted in the hollow interior of a corresponding fan blade of the plurality of fan blades; and (c) a plurality of inserts, wherein each insert of the plurality of inserts is positioned in the hollow interior of each fan blade, between each mounting tab of the plurality of mounting tabs and the interior surface of the corresponding fan blade, wherein each insert of the plurality of inserts is selectively removable relative to a corresponding fan blade and a corresponding mounting tab, and wherein each insert in contact with the leading edge of each corresponding mounting tab, whereby one of the plurality of mounting tabs or the plurality of inserts are configured such that they provide the plurality of fan blades with a predetermined angle of attack.