Patent ID: 8177517

Claim:
Blade ( 1 ) for a rotor of a wind turbine having a substantially horizontal rotor shaft, said rotor comprising a hub, from which the blade ( 1 ) extends substantially radially when mounted, said blade ( 1 ) comprising a chord plane (K) extending between the leading edge ( 5 ) and the trailing edge ( 6 ) of said blade, and said blade ( 1 ) comprising a root area ( 2 ) closest to the hub, an airfoil area ( 4 ) furthest away from the hub and a transition area ( 3 ) between the root area ( 2 ) and the airfoil area ( 4 ), and said blade ( 1 ) comprising a single airfoil substantially along the entire airfoil area ( 4 ), characterized in that the blade ( 1 ) comprises at least a first root segment ( 7 ) and a second root segment ( 8 ) along substantially the entire root area ( 2 ), said segments being arranged with a mutual distance transverse to the chord plane (K), and that at least one of the root segments ( 7 , 8 ) has an airfoil profile, wherein the total length of the root area and the transition area is between 5% and 25% of the total length of the blade, and wherein the root area ( 2 ) of the blade ( 1 ) is provided with a number of mounting holes ( 11 ) disposed along a circle.