Patent ID: 6579063
Filing Date: 2003-06-17
Classification: F01P,F04D

Abstract:
A fan comprisinga hub rotatable on an axis, a plurality of airfoil-shaped blades, each of which extends radially outward from a root region attached to said hub to a tip region, a generally circular band connecting the blade tip regions, each of said blades: (i) in the region between r/R=0.70 and a blade tip (r/R=1.00), either having a generally radial planform or being generally rearwardly swept away from the direction of rotation; and (ii) being oriented at a pitch ratio which: A. generally increases from a first radial location, at r/R=0.85, to a second radial location, said second radial location being between r/R=0.90 and r/R=0.975 and B. generally decreases from said second radial location to said blade tip.