PROBLEM TO BE SOLVED: To provide a propeller boss cap with a fin for which a cost of manufacture can be reduced compared with conventional one.;SOLUTION: A propeller boss cap 1 with fin comprises a boss cap 2 which is a weldment structure of an iron plate, plural fins 3 of an iron plate which are located in a circumferential direction at regular intervals, and are welded and fixed to an outer peripheral surface of the boss cap 2. The boss cap 2 is a truncated cone-shaped cylindrical body, a small diameter end part of which is closed. A large diameter end part of the boss cap 2 is fixed to a propeller A. The boss cap 2 comprises: a small diameter circular disk 2a; a truncated cone-shaped cylindrical body 2b which is a weldment structure; a pair of large diameter circular ring plates 2c; a cylindrical body sandwiched between the pair of large diameter circular ring plates 2c; and plural ribs 2e which are located in a circumferential direction at regular intervals, and are welded and fixed to an outer peripheral surface of the cylindrical body, which are sequentially located from top to bottom.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2018,JPO&INPIT
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