| 摘要 |
PROBLEM TO BE SOLVED: To provide a blade shape capable of improving workability while maintaining lift characteristics and drag characteristics. SOLUTION: This blade shape 20 is formed of a blade under surface 3 coincident with a blade chord line 9 being a straight line of connecting a front edge A and a rear edge C, and a blade upper surface 4 formed of a front edge curved part 2 overhanging in the upper direction by starting from the upper edge A and a rear edge straight linear part 1 of a straight line shape reaching the rear edge by continuing to the front edge curved part 2. The length L3 (in the same as the length of a line segment BC) of the rear edge straight linear part to a blade cord length L, and an angleθ3 formed of the blade under surface 3 and the rear edge straight linear part 1 are set to L > L3≥0.3×L 10°>θ3 > 0°, respectively. Thus, since the blade shape 20 is a straight line in the total length of the blade under surface 3 and a straight line in the rear edge straight linear part 1 of the blade upper surface 4, a curved range is limited to the front edge curved part 2 of the blade upper surface 4, so that the workability is improved. COPYRIGHT: (C)2008,JPO&INPIT
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