Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Sectional – staged or nonrigid working member
Patent
1981-08-27
1982-12-21
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Articulated, resiliently mounted or self-shifting impeller...
Sectional, staged or nonrigid working member
416167, 416 41, F03D 702
Patent
active
043647081
ABSTRACT:
A windmill having blades with both variable pitch and variable spanwise twist. The windmill includes a hub which may be supported on top of a tower for rotation about a substantially horizontal axis. A plurality of blades are provided, each having a root, a tip and a spanwise twistable intermediate section. Linkage mechanisms connect the roots of the blades to the hub to permit selective independent rotation of the roots and the tips of the blades for varying the pitch and the spanwise twist of the blades. An electric power generator is drivingly connected to the hub. A control mechanism is connected to the linkage mechanisms for varying the pitch and spanwise twist of the blades in accordance with a predetermined desired relationship. The aerodynamic properties of the blades are adjusted by the control mechanism to permit the most efficient generation of electric power under most wind conditions, while minimizing the extent of the supporting tower structure normally necessary to accommodate heavy wind conditions. This may be done by maximizing the torque and rotational velocity for minimum reactive forces being exerted on the supporting tower.
REFERENCES:
patent: 1833059 (1931-11-01), Thomas
patent: 1857509 (1932-05-01), Holmstrom
patent: 2000049 (1935-05-01), Taylor
patent: 2020366 (1935-11-01), MacCallum
patent: 2309899 (1943-02-01), Hepperle
patent: 2584663 (1952-02-01), Bensen
patent: 3874816 (1975-04-01), Sweeney
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