Did anyone know there are two categories of wind turbines? There are also vertical apart from horizontal, no matter if I and maybe all of you have never seen any vertical .. Wind energy was first used in Persia between 900-500 μ.Χ and in the later Iran in the 7th century in Europe appears at the time of the Middle Ages ... For their construction are used various resins, from polyester to glass fibers and carbon ... I hope it was informative and restful ...