| 摘要 |
PROBLEM TO BE SOLVED: To provide a blade for a windmill which suppresses a fluctuating load due to self-weight and in which vibration hardly occurs in a windmill even when an outer skin is formed by fiber-reinforced plastic.SOLUTION: A blade 1 for a windmill includes: a mounting part 11 mounted on a rotary shaft of a windmill; and a blade part 12 extending from the mounting part 11. The blade part 12 and the mounting part 11 include an outer skin 15 which is integrally molded by fiber-reinforced plastic in which the reinforcing fiber is impregnated with synthetic resin so that an internal space S is formed. The outer skin 15 is configured in such a manner that a plurality of fiber-reinforced plastic layers 15A, 15B, 15C made of fiber-reinforced plastic are laminated in a thickness direction of the outer skin 15. The density of the reinforcing fiber contained in the fiber-reinforced plastic layer 15C on an inner wall surface 12a side of the outer skin 15 of the blade part 12 is higher than the density of the reinforcing fiber in the fiber-reinforced plastic layer 15C on an outer wall surface 12b side of the outer skin 15 of the blade part 12. |
