Rotor blade for a wind turbine, the rotor blade comprising - an aerodynamic device for influencing the airflow flowing from the leading edge section of the rotor blade to the trailing edge section of the rotor blade, wherein the aerodynamic device is mounted at a surface of the rotor blade and comprises a pneumatic or hydraulic actuator, such as a hose or a cavity, of which the volume depends on the pressure of a fluid being present inside the pneumatic or hydraulic actuator; - a flow regulating unit for influencing the airflow flowing from the leading edge section of the rotor blade to the trailing edge section of the rotor blade, and - a control unit for controlling the pressure of the fluid in the pneumatic or hydraulic actuator of the aerodynamic device, wherein the aerodynamic device comprises a first section and a bending part, wherein the bending part functions as a hinge, such that when no pressure application to the fluid in the pneumatic or hydraulic actuator is induced by the control unit, the first section is at a first position protruding away from the surface of the rotor blade (20, causing the aerodynamic device in a first configuration, and when the control unit induces the application of a positive or negative pressure to the fluid in the pneumatic or hydraulic actuator, the pneumatic or hydraulic actuator is expanded or collapsed to rotate the first section to a second position closing to the surface of the rotor blade, causing the aerodynamic device in a second configuration, such that - the lift of the rotor blade in the first configuration is smaller than the lift of the rotor blade in the second configuration. - an aerodynamic device for influencing the airflow flowing from the leading edge section of the rotor blade to the trailing edge section of the rotor blade, wherein the aerodynamic device is mounted at a surface of the rotor blade and comprises a pneumatic or hydraulic actuator, such as a hose or a cavity, of which the volume depends on the pressure of a fluid being present inside the pneumatic or hydraulic actuator; - a flow regulating unit for influencing the airflow flowing from the leading edge section of the rotor blade to the trailing edge section of the rotor blade, and - a control unit for controlling the pressure of the fluid in the pneumatic or hydraulic actuator of the aerodynamic device, wherein the aerodynamic device comprises a first section and a bending part, wherein the bending part functions as a hinge, such that when no pressure application to the fluid in the pneumatic or hydraulic actuator is induced by the control unit, the first section is at a first position protruding away from the surface of the rotor blade (20, causing the aerodynamic device in a first configuration, and when the control unit induces the application of a positive or negative pressure to the fluid in the pneumatic or hydraulic actuator, the pneumatic or hydraulic actuator is expanded or collapsed to rotate the first section to a second position closing to the surface of the rotor blade, causing the aerodynamic device in a second configuration, such that wherein the aerodynamic device comprises a first section and a bending part, wherein the bending part functions as a hinge, such that when no pressure application to the fluid in the pneumatic or hydraulic actuator is induced by the control unit, the first section is at a first position protruding away from the surface of the rotor blade (20, causing the aerodynamic device in a first configuration, and when the control unit induces the application of a positive or negative pressure to the fluid in the pneumatic or hydraulic actuator, the pneumatic or hydraulic actuator is expanded or collapsed to rotate the first section to a second position closing to the surface of the rotor blade, causing the aerodynamic device in a second configuration, such that - the lift of the rotor blade in the first configuration is smaller than the lift of the rotor blade in the second configuration.