| 摘要 |
PURPOSE:To prevent the occurrence of a local high stress by making a through- hole such that the angle between a through-hole made in a twisted blade and the center line of a lacing wire is equal to the recovering amount from twist during operation. CONSTITUTION:A through-hole 2 is formed in a twisted blade 1 and a lacing wire 3 is inserted. The through-hole 2 is made while being displaced in same direction from the twisting direction 4 of the blade 1 so that the angle theta between the center line 2' of the through-hole 2 and the center line 3' of the lacing wire 3 is equal to the recovering amount from twist during operation of engine. Since the through-hole and the lacing wire contact in line during operation, occurrence of local high stress can be prevented.
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