Patent ID: 9011099
Filing Date: 2015-04-21
Classification: F01D,F04D,F05D

Abstract:
1. A high volume low speed fan system, comprising: a plurality of airfoils each having a generally elliptical top surface, a leading edge and a generally elliptical bottom surface wherein each airfoil is mounted to a flange on a central hub; a motor attached to a frame member wherein the motor is coupled to a drive mechanism for rotating the airfoils wherein the drive mechanism is rotatably coupled to the central hub; and a wingtip fence attached to a distal end of the airfoils for reducing drag of the airfoils having a vertical member that extends from a mid-section of the fan blade rearwardly and a forward portion that attaches substantially flush with the fan blade, and a vertical flap extending above the top surface of each of the airfoils wherein the vertical flap has a lower flap extending vertically below the bottom surface of each of the airfoils and rearwardly away from said leading edge commencing approximately at the widest portion of the fan blade.