(a) a first region adjacent said root of said blade with forward curvature A vehicle fan assembly for circulating air to cool an engine, said fan assembly comprising:Ī plurality of blades with a planform, a root joined to said hub, a tip, and a span between said root and said tip, said blades extending generally radially outward from said hub and each said planform having: The planform according to claim 1 wherein said second region having backward curvature extends from the tip to an end point of said intermediate region located between about sixty and seventy-percent of the span of the blade.ĥ. The planform according to claim 2 wherein said intermediate region having substantially straight curvature extends from said terminus of said first region to an end point located about sixty-percent of the span of the blade and said second region having backward curvature extends from said end point of said intermediate region to the tip of the blade.Ĥ. The planform according to claim 1 wherein said first region having forward curvature extends from the root to a terminus located about forty-percent of the span of the blade.ģ. A planform defining the shape of blades of a vehicle engine-cooling fan assembly, each blade having a root, a tip, and a span between the root and tip, said planform comprising:Ī first region adjacent the root of the blade having forward curvature Ī second region adjacent the tip of the blade having backward curvature andĪn intermediate region disposed between said first region and said second region having substantially straight curvature.Ģ. Method of producing propeller blades and improved propeller blades obtained by means of this methodīlading structure for axial flow turbo-machinesġ. Multi-sweep blade with abrupt sweep transitionįalciform blade for a propeller and its application in particular in motorized fans for automobilesĪirfoil for high efficiency/high lift fanĮngine cooling fan and fan shrouding arrangementĪxial fan, particularly for motor vehicles High efficiency, low noise, axial flow fanĪxial fan, particularly for motor vehicles for agricultural use Ultra-thin low noise axial flow fan for office automation machines High efficiency, low axial profile, low noise, axial flow fan The nose section has a thickness which is greater than the thickness of the airfoil between the pressure surface and the suction surface and the nose section blends smoothly into the pressure surface and the suction surface.įan having a blade structure for reducing noise The airfoil has a leading edge a rounded, bulbous nose section adjacent the leading edge a trailing edge a curved pressure surface extending smoothly and without discontinuity from the nose section to the trailing edge a curved suction surface extending smoothly and without discontinuity from the nose section to the trailing edge and a thin, highly cambered aft section formed adjacent the trailing edge and between the pressure surface and the suction surface. The planform has a first region adjacent the root of the blade with forward curvature, a second region adjacent the tip of the blade with backward curvature, and an intermediate region disposed between the first region and the second region with substantially straight curvature. A blade for a vehicle engine-cooling fan assembly having a curved planform and a high-lift airfoil.
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