| 摘要 |
A spiral blade unit is disclosed, which generates less blade-sagging, deformation, or vibration, can be made of various material, can be made with light material, and can be installed easily in interconnecting spiral blades. The spiral blade unit includes a rotational axle and spiral blades with root portions attached along an outer circumferential surface of the rotational axle, and the spiral blades are interconnected to one another through a blade connector. |
