Mizutori-class submarine chaser
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 JDS Mizutori | |
| Class overview | |
|---|---|
| Name | Mizutori class |
| Builders | |
| Operators |  Japan Maritime Self-Defense Force |
| Preceded by | Umitaka class |
| Built | 1959–1965 |
| In commission | 1960–1999 |
| Planned | 8 |
| Completed | 8 |
| Retired | 8 |
| General characteristics | |
| Type | Submarine chaser |
| Displacement | |
| Length | 60.5 m (198 ft 6 in) |
| Beam | 7.1 m (23 ft 4 in) |
| Draft | 2.3 m (7 ft 7 in) |
| Depth | 4.4 m (14 ft 5 in) |
| Propulsion |
|
| Speed | 20 kn (37 km/h; 23 mph) |
| Complement | 80 |
| Sensors & processing systems | |
| Electronic warfare & decoys | NOLR-1 |
| Armament |
|
The Mizutori-class submarine chaser was a class of submarine chasers of the Japan Maritime Self-Defense Force after the Second World War, in the early 1960s.
In this type, the navigation performance was improved and the design was rationalized based on the operational results of the preceding 1954 planned boats (Kari-class, Kamome-class). The basic design was carried out by the Ship Design Association for boats in 1954, but it was transferred from this model to the Technical Research Institute of the Defense Agency (at that time), and the plan number was K103A.[1]
They were designed to be larger (1.4 times the standard displacement) based on the FY1954 plan, and the ship type was the same flush deck type. In the 1954 classes, the elaborate design with extremely thin plates led to an increase in man-hours, so the bow was 2.9 to 3.2 mm thick, but now it is 4.5 to 6 mm, and the area below the waterline is also 4.5 to 8 mm. Although it was thickened to millimeters, it still had a thin plate structure as a whole. In addition, in the 1954 classes, the bridge and the deck room were separated to reduce the area on the wind pressure side, but there were drawbacks such as the inconvenience of communication inside the ship in stormy weather and the inability to secure sufficient space inside the ship. Therefore, in this model, the front and rear superstructures are integrated so that it can be easily moved back and forth even in stormy weather.[2]
In addition to the wing on the bridge, they were equipped with the flagship equipment, so the superstructure is extended 2.5 meters to the rear to provide the headquarters general affairs room. In addition, since the 1934 boat, corrugated panels have been adopted on the side walls of the superstructure to reduce man-hours and weight.[3][2]
On the other hand, as the main engine, the Umitaka-class was equipped with the same medium-speed robust diesel main engine manufactured by Mitsui Zosen as well as the Kamome-class, while this type has a relatively lightweight high-speed diesel main engine with almost the same configuration as the scale type. It was equipped with a V8 V22 / 30 type 4-cycle single-acting V-type 16-cylinder exhaust turbocharged diesel engine produced by Kawasaki Heavy Industries under a license agreement with MAN. It did not have a self-reversing mechanism and was connected to the propeller via a fluid coupling and a reducer.[4][1]