Fluid reaction surfaces (i.e. – impellers) – Radially extensible or retractible rotor working member – Variable work surface or non-rigid connection
Patent
1980-12-01
1982-06-22
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Radially extensible or retractible rotor working member
Variable work surface or non-rigid connection
416 41, 416 23, 416 11, F03D 704
Patent
active
043359965
ABSTRACT:
Opposing windmill airfoil blades extend from a central hub and are connected thereto by a pair of cables secured to the inner ends of the blades and which each freely engages through the opposite ends of a cross member secured to the hub. These cables then extend to a reel on the hub thus forming a triangular configuration to support each airfoil blade. The reel is driven by a small reversible electric motor which extends and retracts the cables and hence the blades depending upon the tension in the cables which is sensed by a sensor which in turn actuates the electric motor. As the wind speed increases in velocity, the cables lengthen and vice-versa. Guide vanes or control tail wings extend from adjacent the inner ends of each of the airfoil blades and are fixed in manufacture thus automatically presenting the desired angle of attack of the airfoil blades to the wind. The rigidity of the cables, due to centrifugal force, allows the rotation of the assembly to rotate the shaft extending from the hub which may drive a generator. Conventional yaw control means are provided to maintain the blades in the desired direction relative to the wind direction.
REFERENCES:
patent: 970616 (1910-09-01), Edison
patent: 1757667 (1930-05-01), Hesse
patent: 2117788 (1938-05-01), Cable et al.
patent: 2403899 (1946-07-01), Ammen
patent: 2437789 (1948-03-01), Robins
patent: 4029435 (1977-06-01), Barker
Ade Stanley G.
Powell Jr. Everette A.
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