Patent ID: 7771158

Claim:
An apparatus for extracting power from the wind comprising: at least one fluid directing formation to define a channel having a flow accelerating constriction shaped such that the air flows through the channel and is caused to accelerate as it flows through the flow accelerating constriction of the channel; a fluid drivable engine disposed at a position exterior to the channel; a conduit disposed to provide fluid communication between the fluid drivable engine, an open end of said conduit extending into said flow accelerating constriction and a portion of the channel having an accelerated fluid flow, the fluid drivable engine being arranged such that fluid flow along the conduit caused by reduced pressure at the open end of the said conduit acts to drive the fluid drivable engine, wherein said flow accelerating constriction includes at least one airfoil shaped formation or a plurality of airfoils defining at least one channel or a plurality of channels having flow accelerating constrictions.