| 摘要 |
A blade for windmills fabricated of sheet metal to form a generally hollow structure containing a reinforcing member. The surfaces of the blade are such that the forward surface is flat and rear of the blade is formed by two surfaces which extend in opposite directions from a line extending from a radially inner point at a rearward side of the pitch axis of the blade to a point at the radial outer end and forward of the pitch axis of the blade.
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