Rotor blades

Rotor blades material
        Most modern rotor blades on large wind turbines are made of glass fibre reinforced plastics (GRP), i.e. glass fibre reinforced polyester or epoxy. Using carbon fibre or aramid (Kevlar) as reinforcing material is another possibility, but usually such blades are uneconomic for large turbines. Wood, wood-epoxy, or wood-fibre-epoxy composites have not penetrated the market for rotor blades, although there is still development going on in this area. Steel and aluminum alloys have problems of weight and metal fatigue respectively. They are currently only used for very small wind turbines.

Video frames
- Blade shape: general, graph