PROPELLER BLADE FOR WIND POWER GENERATOR AND METHOD FOR MANUFACTURING IT, AND MAIN SPAR FOR PROPELLER BLADE AND METHOD FOR MANUFACTURING IT

摘要

PROBLEM TO BE SOLVED: To provide a propeller blade for a wind power generator excellent in durability capable of lightening weight in the case the blade of this kind is very large enlarged and preventing generation of damage and crack even in use for long years. SOLUTION: This propeller blade is constituted by a main spar 13 having a sectional shape of closed curve state to be positioned in a wind pressure center part, front/rear reinforcing members 14, 15 arranged in both sides of this main spar 13, and a reinforced resin-made skin layer 12 wrapping the peripheral total unit of these reinforcing materials 14,15 and this main spar 13, also to be connected in a side of a leading edge 11a which is a side of this blade 10 cutting a wind of a reinforced cloth provided in the skin layer 12.