| 摘要 |
PROBLEM TO BE SOLVED: To provide an icebreaker capable of improving propelling performance even in the open water. SOLUTION: In this icebreaker 1, a wave making bulb 3 is installed on the board side or the ship's bottom 2 of a bow part so that the installing height becomes a range up to the height of 1/2 of draft from the ship's bottom 2.
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