Umitaka-class submarine chaser

Edit links
Source: Wikipedia, the free encyclopedia.

JDS Umitaka
Class overview
NameUmitaka class
Builders
Operators Japan Maritime Self-Defense Force
Preceded byHayabusa class
Succeeded byMizutori class
Built1959–1963
In commission1959–1989
Planned4
Completed4
Retired4
General characteristics
TypeSubmarine chaser
Displacement
Length60.5 m (198 ft 6 in)
Beam7.1 m (23 ft 4 in)
Draft2.3 m (7 ft 7 in)
Depth4.4 m (14 ft 5 in)
Propulsion
  • 2 ×
    diesel electric engines
  • 2 × shafts
Speed20 kn (37 km/h; 23 mph)
Complement80
Sensors and
processing systems
Electronic warfare
& decoys
Armament

The Umitaka-class submarine chaser was a class of

Second World War
, in the late 1950s.

Design

In this type, the navigation performance was improved and the design was rationalized based on the operational results of the preceding 1954 planned boats (

Defense Agency (at that time), and the plan number was K103B.[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]

Air conditioning has been introduced in some areas such as battle areas and officer's rooms, and the living quarters have been expanded (10% increase in area per person), improving livability. However, due to these factors, the center of gravity rose and the stability deteriorated, and Umitaka and Otaka were equipped with about 15 tons of

center of gravity were taken in sequence by reexamining including the equipment, such as changing the thickness of the upper deck (from 6 mm to 5 mm).[2]

In addition to the wing on the bridge, only the final ship, Kumataka was 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]

As the main engine, a relatively heavy medium-speed robust

Mitsui Zosen under a license agreement with B & W in Denmark. It was equipped with a trunk-piston diesel engine with a cycle single-acting in-line 6-cylinder exhaust turbocharger. This was developed as a sister engine with half the cylinder output of the 950VBU60 type (output 6,000 horsepower) of the Ikazuchi class' Inazuma built in the previous year's plan. It is equipped with a self-reversing mechanism and is directly connected to the propulsion device. The fuel used was No. 1 A heavy oil for ordinary diesel engines.[4]

Equipment

As a

OPS-16. In addition, since this model, a radio wave detector (ESM) for electronic warfare support has been installed, and the first two ships (Umitaka and Otaka) built in the 1957 plan was installed directly at the rear end of the superstructure, while it was installed on the pillars of the last two ships.[3][2]

The high-angle machine gun system was similar to that of the 1954 boats, and was equipped with a Mk.1 40mm twin machine gun on the front deck. It was commanded by the Mk.63

Y gun) placed on the rear deck. The two early-built boats used short torpedo projectors that project 483 mm diameter Mk.32 short torpedoes, while the two late-built boats (Wakataka and Kumataka) were made in the United States and 324. It was changed to a 68-type triple short torpedo launcher that produced a licensed Mk.32 with a millimeter diameter. This became standard equipment on the subsequent Maritime Self-Defense Force guard ships, but this class and Mizutori-class submarine chaser were the first equipped boats.[2]

Ships of class

Umitaka-class repair submarine chaser
Pennant number Name Builders Laid down Launched Commissioned Redesignated Decommissioned
PC-309 / ASU-86 Umitaka Kawasaki Heavy Industries 13 May 1959 25 July 1959 30 November 1959 17 March 1980 10 March 1984
PC-310 / ASU-88 Otaka Kure Naval Arsenal 18 March 1959 3 September 1959 14 January 1960 27 March 1981 5 March 1985
PC-317 / ASU-64 Wakataka 5 March 1962 13 November 1962 30 March 1963 27 March 1985 17 March 1988
PC-318 / ASU-65 Kumataka Fujinagata Shipyards 20 March 1963 20 October 1963 25 March 1964 27 March 1989

Citations

  1. ^ 「フォト・メモワール 海上自衛隊駆潜艇 全タイプ」『世界の艦船』. Vol. 675. 海人社. June 2007. pp. 45–51.
  2. ^ a b c d e 「海上自衛隊駆潜艇の技術的特徴」『世界の艦船』. Vol. 675. 海人社. June 2007. pp. 152–157.
  3. ^ a b 「海上自衛隊哨戒艦艇のテクニカル・リポート」『世界の艦船』. Vol. 466. 海人社. June 1993. pp. 82–91.
  4. ^ 「海上自衛隊哨戒艦艇用主機の系譜」『世界の艦船』. 海人社. June 1993. pp. 92–97.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Umitaka-class_submarine_chaser&oldid=1149139848"