1
Jilken Leif: Device at a wind propeller.. Stangakonsult Kalmar, November 28, 1984: EP0126114-A1 (36 worldwide citation)

Wind propeller the blades (1) of which are permanently connected to a rotatably mounted hub (2). The invention is characterized in that the blades (1) of the propeller have a radially displaceable disc which, under the influence of a springing means (4) working between the disc (3) and the blade (1) ...


2
Device at a wind propeller. June 7, 1984: WO/1984/002163

Wind propeller the blades (1) of which are permanently connected to a rotatably mounted hub (2). The invention is characterized in that the blades (1) of the propeller have a radially displaceable disc which, under the influence of a springing means (4) working between the disc (3) and the blade (1) ...