Momi-class destroyer
Ashi
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| Class overview | |
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| Name: | Momi class |
| Builders: | |
| Operators: |
 Imperial Japanese Navy
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| Preceded by: | Kawakaze class |
| Succeeded by: | Minekaze class |
| Built: | 1918–1923 |
| In commission: | 1919–1946 |
| Planned: | 28 |
| Completed: | 21 |
| Cancelled: | 7 |
| Lost: | 11 |
| Scrapped: | 10 |
| General characteristics as built | |
| Type: | Destroyer |
| Displacement: |
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| Length: | |
| Beam: | 7.9 m (26 ft) |
| Draft: | 2.4 m (8 ft) |
| Installed power: |
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| Propulsion: | 2 shafts; 2 × Parsons steam turbines |
| Speed: | 36 knots (67 km/h; 41 mph) |
| Range: | 3,000 nmi (5,600 km; 3,500 mi) at 15 knots (28 km/h; 17 mph) |
| Complement: | 148 |
| Armament: |
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The Momi-class destroyers were a class of twenty-one second-class destroyers of the Imperial Japanese Navy. All were named for plants. Obsolete by the beginning of the Pacific War, the Momis were relegated to mostly secondary roles, with some vessels serving throughout the war as patrol vessels or high speed transports.
Construction of the medium-sized Momi-class destroyers was authorized as part of the Imperial Japanese Navy's 8-4 Fleet Program from fiscal 1918-1920, as an accompaniment to the larger Minekaze class with which they shared many common design characteristics. These vessels were produced at a several shipyards around Japan, and when formed into attack squadrons of two to four vessels, made up the backbone of the inter-war Imperial Japanese Navy.
The final seven vessels planned for this series were cancelled, and re-ordered as the new Wakatake-class destroyers in 1919.
The Momi class was a development of the Enoki second-class destroyers, relying on the same basic hull. They were quite small, comparable to Royal Navy corvettes. The design incorporated features discovered on German destroyers captured during World War I, including a lengthened forecastle with a break forming a well deck immediately forward of the bridge. This arrangement, apparently derived from contemporary torpedo boat practice, offered the advantage of a low, semi protected area for the forward torpedo tubes albeit at the cost of becoming awash in heavy seas. Initial problems with stability during high-speed turns were later corrected by widening the beam and bringing up the waterline.
When compared with the Minekaze class, the smaller size necessitated a reduction from four boilers to three and the adoption of lighter-weight Parsons direct-drive turbines, resulting in a drop from 38,500 hp in the Minekaze class to 21,500 hp (16,000 kW) in the Momi class. In addition, bunkerage was lowered to 275 tons of oil fuel.
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