Patent ID: 6752595
Filing Date: 2004-06-22
Classification: F03D,F05B,Y02E,Y10S

Abstract:
A power-generating propeller-style wind turbine provided with a plurality of turbine blades distributed equiangularly within a plane perpendicular to a horizontal rotating shaft and around a hub provided on the rotating shaft, the turbine blades each having a blade tip, said turbine comprising:a blade body of each of said plurality of turbine blades, wherein each body includes a tip auxiliary blade housed in said blade body and able to extend towards and extract away from a blade tip; an auxiliary blade extension-and-retraction unit for protruding the tip auxiliary blade toward the respective blade tips to increase an overall length of the blade; and a pitch changing guide member for changing a pitch of said tip auxiliary blade operatively connected to an extension-and-retraction guide unit for guiding said tip auxiliary blade to extend and retract.