Windmill with cyclically feathering blades

Details Windmill with cyclically feathering blades Windmill with cyclically feathering blades

1977-04-05

1978-04-18

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

With means positioning fluid current driven impeller...

Feathering cycle related to flow direction

416114, F03D 704

Patent

active

040849210

ABSTRACT:
The invention covers a mechanism for turning a horizontal axis rotor windmill into the direction of the wind, either under the instruction of a small pilot vane, or automatically without the use of such vane. This is accomplished by cyclically controlling the pitch of the rotor blades during revolution whereby to decrease the gyro forces on the rotor when yawing, as well as to take advantage of the force of the wind on the blade to assist turning the axis into the wind. The mechanism of the present invention automatically and cyclically alters the pitch of the blades as the yaw angle of the wind changes so as to present a cyclically different angle of attack between the blades and the wind, thus utilizing the force of the wind to cause the turning of the axis of the rotor into the wind.

REFERENCES:
patent: 2360791 (1944-10-01), Putnam
patent: 3536415 (1970-10-01), Kusiak
patent: 3874816 (1975-04-01), Sweeney et al.
patent: 3902072 (1975-08-01), Quinn

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