Japanese icebreaker Ōtomari
Ōtomari in November 1921 at Kōbe
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| History | |
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 Japan
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| Name: | Ōtomari |
| Namesake: | Port of Ōtomari |
| Ordered: | 1920 Fiscal year under the Eight-eight fleet plan |
| Builder: | Kawasaki Shipbuilding Corporation |
| Laid down: | 24 June 1921 |
| Launched: | 3 October 1921 |
| Completed: | 7 November 1921 |
| Decommissioned: | 15 September 1945 |
| Fate: | Scrapped between October 1949–March 1950. |
| General characteristics as built | |
| Type: | Icebreaker |
| Displacement: | 2,330 long tons (2,367 t) standard |
| Length: | 60.96 m (200.0 ft) pp |
| Beam: | 15.24 m (50 ft 0 in) |
| Draught: | 5.55 m (18 ft 3 in) |
| Propulsion: |
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| Speed: | 13 knots (15 mph; 24 km/h) |
| Range: | 4,000 nmi (7,400 km) at 14 knots |
| Endurance: | Fuel: 500 tons coal |
| Complement: | 101 |
| Armament: |
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The Ōtomari (大泊?) was an icebreaker of the Imperial Japanese Navy (IJN) serving during the 1920s through World War II, the only ship of her class. She was an only icebreaker as warship in the IJN.
Ōtomari was planned as one of the Kamoi-class oilers under the Eight-eight fleet plan at first. However, Nikolayevsk Incident changed her future. IJN was not able to dispatch their warship to Nikolayevsk which froze, because they did not have an icebreaker. All Japanese civilians were killed by terrorists in this incident. Japan was afraid that this dire disaster could occur once again, because the Russian Civil War continued in this time. As a result, the budget for the vessels was rearranged: only the lead ship of Kamoi-class oiler was built, plus three oilers of Ondo-class, one food supply ship (Mamiya), and one icebreaker (Ōtomari).
As Japan had no prior experience in building icebreakers, the IJN began by observing icebreaker architectures of neighboring countries, and decided to base Ōtomari on the Russian icebreaker Dobrynya Nikitich. The IJN hurried the construction of Otomari, because they wanted her by the Winter of 1921, and she was launched less than four months after her keel was laid down.
She was assigned to Ōminato Guard District and took northern patrol duties, and continued active service throughout her life.
Because Ōtomari was small and aging by World War II, the IJN planned her succeeding ship Esan (恵山, Project Number J23, 6,800 tons standard) under the Kai-Maru 5 program in 1942; however Esan was canceled in 1943.
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