Patent ID: 6065937
Filing Date: 2000-05-23
Classification: F04D,Y10S

Abstract:
A fan rotatable about a rotational axis comprising:a hub rotatable around the axis wherein the hub comprises an upstream surface and a circumferential surface, and a plurality of fan blades extending radially from the circumferential surface of the hub, the hub and blades being configured to produce an airflow when rotated about the axis,each blade having a chord length distribution, stagger angle and dihedral distance which varies along the length of the blade, each blade extending axially downstream from the upstream surface of the hub,wherein each blade joins a circular band concentric with the hub and spaced radially outward from the hub, the circular band comprising an upstream edge disposed substantially axially downstream from the upstream surface of the hub,and wherein the rate of change of the dihedral distance of a trailing edge of each blade with respect to a radius of each blade is substantially between -0.88 and +0.44.