Blade for horizontal axis type wind turbine, has trajectories represented in layout depicting movement of air along horizontal axis based on distance traveled by point of blade tip or point of blade foot

摘要

The blade (2) has sheets (4) that are superposed and spaced by spacers. A continuous spiral is formed between a blade foot and a blade tip (8) such that an angle between tangent average to the blade foot and another tangent average to the blade tip is equal to an angle between trajectory from a point of the blade tip and another trajectory from a point of the blade foot. The trajectories are represented in a layout depicting movement of air along a horizontal axis (3) based on distance traveled by the point of the blade tip or the point of the blade foot. The spacers are made of magnesium or composite material. The sheet is made of metal, carbon fiber or Kevlar(RTM: para-aramid synthetic fiber). An independent claim is also included for a wind turbine comprising blades that are regularly spaced around a central core.