NOVELTY - The blade (23) has an unsymmetrical I beam (26) including a web section (27) integral to shorter and longer flanges (28a, 28b) that are arranged proximal to a leading edge (29C) and a trailing edge (29T) of the blade, respectively. The flanges are bonded to an interior surface of the blade at thickened wall areas. The web section includes a medial plane roughly perpendicular to each flange. The medial plane forms a heel-in angle (29h) with a chord line in a plane perpendicular to an air flow direction of the blade.    USE - Wind turbine blade e.g. vertical and horizontal axis wind turbine blades.    ADVANTAGE - The beam can be easily modified, and the blade profile is customized to optimize performance in particular application. The blade profile can be precisely aligned and bonded to the unsymmetrical I beam at junctions of the thickened wall areas and the flanges. The blade can function to vary pitch around a rotational circuit of the wind turbine to enhance performance, and can be mass produced from low cost materials with very low tooling and fabrication costs. The number of blade constructions can be shipped to a site in a compact and flat form and easily assembled into a much larger rotor using minimal lifting equipment and ordinary hand tools. The torque applied by the blade construction to the assembly system during operation of the wind turbine does not affect attachments to the rotor. The blade includes a locking system to prevent the blade from pulling away from the wind turbine rotor assembly, so that length of the blade and subsequent assembly and balancing of the wind turbine rotor can be precisely controlled through fixtures used in the crimping and bonding process. The light weight wood part is bonded to a part of the interior surface of the blade by adhesive at a center section of the blade, so that acceptable load transfer properties can be obtained at the center section of the blade without incurring high costs. The web portion includes a medial plane perpendicular to each flange, so that structural components can be easily utilized with other blade and rotor components to create a low cost wind turbine structure with minimal tooling expenditures.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross sectional view of a composite blade structure.    Turbine blade (23)    Lower lift force (23L)    Unsymmetrical I beam (26)    Web section (27)    Shorter flanges (28a)    Longer flanges (28b)    Adhesive (29a)    Blade leading edge (29C)    Heel-in angle (29h)    Blade trailing edge (29T)    Localized wind vector (100a)    Prevailing wind (100b)