Patent ID: 7249931
Filing Date: 2007-07-31
Classification: F04D,F24F,F28B

Abstract:
1. A method of operating air conditioner condenser or heat pump blades, comprising the steps of: providing two to five twisted blades about a rotatable hub, the rotatable hub having an axis of rotation, each blade having a root end and a tip end and a continuous twist therebetween, the tip end of each of the blades having an airfoil surface being substantially perpendicular to the rotational axis of the hub, the root end of each of the blades having an airfoil surface being substantially tilted to the rotational axis of the hub, each of the twisted blades having a root end chord width substantially greater than a tip end chord width, each of the twisted blades having a root end angle of twist that is greater than a tip end angle of twist; rotating the blades within an air condition condenser or a heat pump at up to approximately 850 rpm; generating airflow from the rotating blades of up to approximately 1930 cfm; and requiring power from a ⅛ hp PSC motor of up to approximately 110 Watts while running the blades and generating the airflow.