Traditional wind blade design — glass fiber laminate shell over a balsa/foam core, surrounding a composite shear web — have done an admirable job of addressing these requirements. But as wind turbine blades get longer, wind turbine manufacturers are looking for ways to reduce materials use, reduce weight, decrease costs and increase manufacturing efficiency.[…]
The design ACT Blade came up with is, actually, a familiar one to anyone who understands aeronautics. It is comprised of a spar to which is attached a series of ribs. Overwrapping this spar/rib structure, in tension, is a technical textile — called a “sock” — that provides the aerodynamic surface the blade requires for wind capture.
Perhaps this method could also apply to rigid AWES or to larger propellers for @Kitewinder or for SuperTurbine ™.