Abstract: A propeller fan comprising a pair of similar sheet metal spider-blade members each having a flat central hub section and two right angularly arranged pairs of narrow radially outwardly projecting spider arms. Each spider arm is twisted at an intermediate portion so that radially outer end portions of the arms of each pair are inclined in opposite directions relative to the hub section. A pair of air moving blades are formed integrally at inner end portions respectively with the outer end portions of the spider arms of one of the pairs of arms. A pair of laterally projecting blade support members are integrally formed respectively with the outer end portions of the other pair of spider arms. Each blade support member is approximately twice as wide as each spider arm and each blade is approximately four times as wide as each spider arm. The width and length of each blade are approximately equal.

Abstract: A propeller fan construction is provided in which the impeller thereof includes a spider member having a plurality of symmetrically arranged planar marginal portions, and a plurality of blades projecting outwardly from the spider member. Each blade has an inner end provided with a planar segment which is fixedly mounted on a planar marginal portion of the spider member. The spider member and each of the blades are formed of sheet material. Each blade is provided with an elongated embossment extending from one elongated edge of the blade in an angular direction relative to the longitudinal axis of the blade. The embossment is position between the outer end of the blade and the planar segment of the inner end.

Abstract: A fan blade and root assembly is disclosed for use in a hot gas engine requiring low weight and high efficiency. The root construction facilitates simple sheet metal stamping fabrication throughout the blade, root, and hub while permitting an air foil shape to be imported to the blade.