Patent ID: 8052394

Claim:
Rotor blade ( 60 ) of a wind energy plant with a top side (suction side) and a bottom side (pressure side), comprising: profiles ( 21 , 22 , 23 , 24 , 25 ) with a front edge and a back edge ( 62 ) in cross-section designed along a longitudinal axis between a rotor blade root and a rotor blade tip, wherein one designed-based direction of air inflow ( 31 , 32 , 33 , 34 , 35 ) is predetermined for each profile ( 21 , 22 , 23 , 24 , 25 ) and the profiles in an outer area facing the rotor blade tip are designed with a relative thickness of less than 30%, wherein an attached device ( 51 ), which has an attached-device inflow surface ( 52 ) and a start point ( 41 , 42 , 43 ) facing the front edge of the attached-device inflow surface ( 52 ) and an end point facing the back edge ( 62 ), is arranged along the longitudinal axis in an inner area assigned to the rotor blade root to profiles ( 21 , 22 , 23 ) with a relative thickness of more than 30% on the pressure side, wherein the start point ( 41 , 42 , 43 ) of the attached-device inflow surface ( 52 ) is arranged in an area between the front edge and the back edge ( 62 ) of the profiles ( 21 , 22 , 23 , 24 , 25 ) so that a tangent to the profile ( 21 , 22 , 23 , 24 , 25 ) in the start point ( 41 , 42 , 43 ) is designed in an angle area between +20° and −20° for the designed-based direction of air inflow ( 31 , 32 , 33 , 34 , 35 ) of the profile ( 21 , 22 , 23 , 24 , 25 ) and wherein the end point of the attached-device inflow surface ( 52 ) ends in front of the back edge ( 62 ).