Wind turbine blades need to be as lightweight as possible. Imagine the shear and tear forces applied on the turbine’s tower. At the same time, the blades have t

Wind turbine blades need to be as lightweight as possible. Imagine the shear and tear forces applied on the turbine’s tower. At the same time, the blades have to be extremely resistant to resist to their own weight and to the wind applying forces perpendicular to the main axis. Polyester is cheap and lightweight. Material strength is then infused in it using fiberglass.