04168439 is referenced by 55 patents and cites 2 patents.

The following specification discloses an improvement in vertical axis wind machines having upstanding blades. The blades are attached to a rotatable ring which support the blades at an angle of forty five degrees to the horizontal plane of the ring. Associated with the wind machine is a wind velocity sensing device producing electrical signals responsive to the wind velocity. Means is provided the blades attached to the ring to adjust the angle of attack of the blades in response to the magnitude of the signals.

Title
Wind turbine
Application Number
5/855186
Publication Number
4168439
Application Date
November 28, 1977
Publication Date
September 18, 1979
Inventor
F Neto Palma
263 Keele St., Toronto
CA
Agent
K Maxwell Hill
IPC
F03D 3/14
F03D 9/00
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