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There is a Rogallo wing having an aerodynamic sheet having a leading end and a trailing edge. The trailing edge is curved to form a sheet of increasing concavity away from the leading edge. At least two folded edges extend between the leading end and the trailing edge are on opposed sides of the aer

There is a Rogallo wing having an aerodynamic sheet having a leading end and a trailing edge. The trailing edge is curved to form a sheet of increasing concavity away from the leading edge. At least two folded edges extend between the leading end and the trailing edge are on opposed sides of the aerodynamic sheet, the two folded edges comprising integral ribs. A wind energy extraction apparatus comprises one or more concentrator wings that react with a flow of wind to induce a drop in static air pressure that is then used to drive one or more impellers and one or more power converters. The one or more concentrator wings are Rogallo wings.

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1. A wind energy extraction apparatus comprising: one or more impellors;one or more power converters;one or more concentrator wings supported in relation to the one or more impellors and one or more power converters to react with a flow of wind in use to induce a drop in static air pressure that is

1. A wind energy extraction apparatus comprising: one or more impellors;one or more power converters;one or more concentrator wings supported in relation to the one or more impellors and one or more power converters to react with a flow of wind in use to induce a drop in static air pressure that is then used to drive the one or more impellors and the one or more power converters, the one or more concentrator wings comprising Rogallo wings;each Rogallo wing being formed of an aerodynamic sheet having a leading edge and a trailing edge, the trailing edge being curved to form a sheet of increasing concavity away from the leading edge;each Rogallo wing including bent edges extending between the leading edge and the trailing edge on opposed sides of the aerodynamic sheet, the bent edges comprising integral ribs; andadjacent Rogallo wings being connected together along respective ones of the bent edges to form an array of Rogallo wings. 2. The wind energy extraction apparatus of claim 1 in which the respective ones of the bent edges of adjacent Rogallo wings are riveted together. 3. The wind energy extraction apparatus of claim 1 in which each array of Rogallo to wings is a linear array. 4. The wind energy extraction apparatus of claim 1 in which the one or more concentrator wings comprise at least two concentrator wings, each concentrator wing being a linear array of Rogallo wings, and being disposed on opposed sides of the one or more impellors. 5. The wind energy extraction apparatus of claim 1 in which each of the arrays of Rogallo wings is supported by cables between supporting fins. 6. The wind energy extraction apparatus of claim 5 in which the cables further comprise at least a first supporting cable and a second supporting cable, the first supporting cable being, disposed through a hollow end on each of the leading edges of the array of interconnected Rogallo wings and the second supporting cable being disposed through a loop on each of the two folded edges. 7. The wind energy extraction apparatus of claim 1 in which the aerodynamic sheet of each Rogallo wing comprises a metal sheet. 8. The wind energy extraction apparatus of claim 7 in which the metal sheet of each Rogallo wing comprises an aluminum sheet. 9. A wind energy extraction apparatus comprising: one or more impellers;one or more power converters;one or more concentrator wings supported in relation to the one or more impellors and one or more power converters to react with a flow of wind in use to induce a drop in static air pressure that is then used to drive the one or more impellors and the one or more power converters, the one or more concentrator wings each comprising an array of Rogallo wings;each Rogallo wing of the array of Rogallo wings being formed of an aerodynamic sheet having a leading edge and a trailing edge, the trailing edge being curved to form a sheet of increasing concavity away from the leading edge;each Rogallo wing of the array of Rogallo wings including side edges extending between the leading edge and the trailing edge on opposed sides of the aerodynamic sheet; andadjacent Rogallo wings in each array of Rogallo wings being connected together along respective ones of the side edges to form a linear array of Rogallo wings. 10. The wind energy extraction apparatus of claim 9 in which there are two or more impellors and two or more power converters, and the one or more concentrator wings react with a flow of wind in use to induce a drop in static air pressure that is then used to drive the two or more impellors and the two or more power converters. 11. The wind energy extraction apparatus of claim 10 in which the one or more concentrator wings comprise at least two concentrator wings, each concentrator wing being a linear array of Rogallo wings and being disposed on opposed sides of the two or more impellors.