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An airfoil 11 for attachment to a hub 13 of a windmill 15 or other turbomachine, the airfoil 11 comprises a leading rod 17 and a trailing rod 27, the leading rod 17 and trailing rod 27 preferably are flexible and able to deflect in a direction opposite to that of the direction of rotation, the leadi

An airfoil 11 for attachment to a hub 13 of a windmill 15 or other turbomachine, the airfoil 11 comprises a leading rod 17 and a trailing rod 27, the leading rod 17 and trailing rod 27 preferably are flexible and able to deflect in a direction opposite to that of the direction of rotation, the leading rod 17 having a first end 19 and a second end 21, the first end 19 secured by a leading rod mount 23 of the hub 13 located at a leading mount location 25, the trailing rod 27 has a base end 29 and a tip end 31, the tip end 31 connected with the second end 21 of the leading rod 17, and the base end 29 secured by a trailing rod mount 33 of the hub 13 located at a trailing mount location 35, and fabric sleeve 37 is stretched over the leading rod 17 and the trailing rod 27; the aerodynamic characteristics of each airfoil are configurable by modifying the orientation of the position/alignment of the leading red 17 relative to the trailing rod 27; and the invention including an assembly of airfoils attached to a hub 13, and a method of harnessing energy using the airfoil 11 of the invention.

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1. An airfoil for attachment to a hub of a windmill, the airfoil comprising: a leading rod having a first end and a second end, the first end secured by a leading rod mount of the hub located at a leading mount location,a trailing rod having a base end and a tip end, the tip end connected with the s

1. An airfoil for attachment to a hub of a windmill, the airfoil comprising: a leading rod having a first end and a second end, the first end secured by a leading rod mount of the hub located at a leading mount location,a trailing rod having a base end and a tip end, the tip end connected with the second end of the leading rod, and the base end secured by a trailing rod mount of the hub located at a trailing mount location,a fabric sleeve stretched over the leading rod and the trailing rod, anda fabric substructure for creating an aerodynamically improved shape for the fabric sleeve when stretched over the leading rod and trailing rod, the fabric substructure comprising a plurality of rod sleeves attached to one or more shape forming skins, which envelop said rod sleeves and are more rigid than the fabric sleeve. 2. An assembly for a windmill comprising a hub and a plurality of airfoils: for each airfoil of the plurality of airfoils, the hub having a leading mount location and a trailing mount location for mounting a plurality of flexible rods, andeach airfoil of the plurality of airfoils having:a leading rod having a first end and a second end, the first end secured by a leading rod mount of the hub located at the leading mount location,a trailing rod having a base end and a tip end, the tip end selectively connected with the second end of the leading rod, and the base end secured by a trailing rod mount of the hub, anda fabric sleeve stretched over the leading rod and the trailing rod, wherein the hub rotates about a central axis, and the leading mount location and the trailing mount location are definable by a cylindrical coordinate system having an origin defined by a point located along the central axis, said cylindrical coordinate system being a combination of radial distance from the central axis, angular position about the central axis, and displacement alone the central axis, and one or more of the following:a. the trailing rod mount of the hub is located at the trailing mount location, and the radial distance of the leading mount location and the radial distance of the trailing mount location are not the same;b. the hub has a plurality of additional trailing mount locations, each definable by the cylindrical coordinate system and each of the plurality of additional trailing mount locations having a set of coordinates that differ from the trailing mount location and / or another of the plurality of additional trailing mount locations, allowing a user to select among an array of airfoil configurations by moving the trailing rod mount among the plurality of additional mount locations;c. the leading rod mount has a leading rod axis of alignment and comprises an engaging member such as cup, a bore, or a tube for engaging the first end of the leading rod, and the leading rod axis of alignment and the trailing rod axis of alignment are parallel;d. the leading rod mount has a leading rod axis of alignment and comprises an engaging member such as cup, a bore, or a tube for engaging the first end of the leading rod, the trailing rod mount has a trailing rod axis of alignment and comprises a cup, a bore, or a tube for engaging the base end of the trailing rod, and the leading rod axis of alignment is fixed, and the trailing rod axis of alignment is variable; ande. the leading rod mount has a leading rod axis of alignment and comprises an engaging member such as cup, a bore, or a tube for engaging the first end of the leading rod, the trailing rod mount has a trailing rod axis of alignment and comprises a cup, a bore, or a tube for engaging the base end of the trailing rod, and the trailing rod mount includes an axis variation pivot for enabling the configuration of a plurality of axes which can be set as the trailing rod axis of alignment. 3. A method of producing energy from wind comprising the steps of: I. providing a wind turbine having a hub;II. providing a plurality of flexible rods;III. assembling an airfoil including the steps of connecting a first end of a leading rod of the plurality of flexible rods to the hub at a leading mount location,connecting a base end of a trailing rod of the plurality of flexible rods to the hub at a trailing mount location,attaching the leading rod to the trailing rod, andsecuring a sleeve of fabric around the leading rod and trailing rod,IV. repeating step III for one or more additional airfoils;V. turning the hub, wherein the hub is mechanically coupled with a generator or alternator which produces power as the hub turns; and either or both of:VI(a) adjusting a shape and or angle of attack of a portion of one or more of the plurality of airfoils by moving the trailing mount location, and changing the color or pattern of the plurality of airfoils by replacing the fabric sleeve with a fabric sleeve of another color or pattern, andVI(b) the trailing rod having a trailing rod axis of alignment at a trailing mount location, and the method further including the step of modifying the trailing rod axis of alignment at the trailing mount location to create a modified airfoil shape and / or angle of attack along portions of the airfoil.