| 摘要 |
A propeller (20) for a boat includes a hub (30) having a tail portion (36) with an outlet (34), and a plurality of blades (40) equiangularly disposed on the hub (30). The outer periphery of the tail portion (36) defines with a center axis (A) of the hub (30) a distance gradually decreasing toward the outlet (34). Thus, the propeller has the advantages of reducing the drag and increasing the propulsive force of the boat when it rotates. |
