WINDMILL BLADE WHICH MAIN WING CAN CHANGE ROTATING ANGLE ACCORDING TO WIND DIRECTION AND WINDMILL

摘要

A windmill blade for a vertical axis windmill, includes a main wing (2) and a flow guiding part (3), said main wing (2) can to-and-fro rotate a certain angle with respect to said flow guiding part (3) according to wind direction, said main wing (2) is adjacent to two sides of said flow guiding part (3), and is stopped by means of cooperating with the two sides of said flow guiding part (3).