Self-fairing windmill vane

Details Self-fairing windmill vane Self-fairing windmill vane

1986-06-06

1987-07-21

Rowell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Articulated, resiliently mounted or self-shifting impeller...

Sectional, staged or nonrigid working member

416117, 416240, 416197A, F03D 306

Patent

active

046815120

ABSTRACT:
A windmill vane for use with a windmill having a vertical shaft. The vane comprises an open, rigid, planar, preferably semi-elliptical frame and a flexible sail on the frame. The frame can also be chevron shaped or semi-rectangular in shape. One end of the frame is affixed to the shaft, ad the other end is aligned therewith horizontally and radially outwardly from the shaft. The planar frame is oriented with a central portion leading the ends thereof relative to the instantaneous direction of movement of the frame around the shaft. The central portion of the frame is inclined at a 45.degree. angle upwardly from the frame ends relative to such instantaneous direction of movement. The sail is light weight, resilient, and preferably carried by a loose sleeve around the frame. The design of the vane ensures that the sail is full when moving with the wind and streams directly behind the frame when moving across and against the wind.

REFERENCES:
patent: 589530 (1897-09-01), Knowlton
patent: 662737 (1900-11-01), Puszkar
patent: 802144 (1905-10-01), Harrington
patent: 811218 (1906-01-01), Harrington
patent: 1352952 (1920-09-01), Gracey
patent: 2677344 (1955-05-01), Annis
patent: 3810712 (1974-05-01), Hillman
patent: 3995170 (1976-11-01), Graybill
patent: 4191507 (1980-03-01), DeBerg
patent: 4527950 (1985-07-01), Biscomb
Moretti and Divone, Modern Windmills, Scientific American, Jun. 1986, pp. 110-118.

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