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Umitaka-class submarine chaser

January 01, 1970

The Umitaka-class submarine chaser was a class of submarine chasers of the Japan Maritime Self-Defense Force after the Second World War, in the late 1950s.

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
Speed20 kn (37 km/h; 23 mph)
Complement80
Sensors and
processing systems
Electronic warfare
& decoys
  • OLR-4B (PC-309, 310)
  • NOLR-1 (PC-317, 318)
Armament

Design edit

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 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 fixed ballast. In addition, for the following boats, measures to lower the 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 diesel engine with almost the same configuration as the Kamome-class has adopted, and the 635VBU-45 type 2 manufactured by 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 edit

As a sonar, the 25.5 kHz class scanning AN/SQS-11A was installed on the bottom of the twin Bofors 40 mm gun, just like the 1954 classes. On the other hand, as a radar, the 1954 boats were equipped with AN/SPS-5B, which was made in the United States and used the X band, while this model was made in Japan and used the C band, 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 Fire Control System (GFCS), with the director on the bridge top and the fire radar on the gun side. In addition, the hedgehog Mk.10 anti-submarine mortar is placed just before the bridge structure behind it, and a 54-type depth charge drop rail (6 depth charges for 1 line) is placed on each side of the stern. Is. However, in the 1954 boats, an anti-submarine short torpedo equipped with a guidance device was adopted instead of the 55-type depth charge projector (so-called 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 edit

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 edit

  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.

January 01, 1970
umitaka, class, submarine, chaser, class, submarine, chasers, japan, maritime, self, defense, force, after, second, world, late, 1950s, umitakaclass, overview, nameumitaka, class, builderskawasaki, heavy, industries, corporation, fujinagata, shipyards, operato. The Umitaka class submarine chaser was a class of submarine chasers of the Japan Maritime Self Defense Force after the Second World War in the late 1950s JDS UmitakaClass overview NameUmitaka class BuildersKawasaki Heavy Industries IHI Corporation Fujinagata Shipyards Operators Japan Maritime Self Defense Force Preceded byHayabusa class Succeeded byMizutori class Built1959 1963 In commission1959 1989 Planned4 Completed4 Retired4 General characteristics TypeSubmarine chaser Displacementstandard 440 t 430 long tons PC 309 310 460 t 450 long tons PC 317 318 full load 500 t 490 long tons PC 309 310 520 t 510 long tons PC 317 318 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 Propulsion2 Mitsui B amp W 635VBU 45 diesel electric engines 2 shafts Speed20 kn 37 km h 23 mph Complement80 Sensors and processing systemsOPS 16 air search radar AN SQS 11A sonar Mark 63 fire control system Electronic warfare amp decoysOLR 4B PC 309 310 NOLR 1 PC 317 318 Armament1 twin Bofors 40 mm gun 1 hedgehog anti submarine mortar 1 Type 54 depth charge rack 2 Mark 2 single torpedo tube PC 309 310 2 Type 68 triple torpedo tube PC 317 318 Contents 1 Design 2 Equipment 3 Ships of class 4 CitationsDesign editIn 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 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 fixed ballast In addition for the following boats measures to lower the 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 diesel engine with almost the same configuration as the Kamome class has adopted and the 635VBU 45 type 2 manufactured by Mitsui Zosen under a license agreement with B amp 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 editAs a sonar the 25 5 kHz class scanning AN SQS 11A was installed on the bottom of the twin Bofors 40 mm gun just like the 1954 classes On the other hand as a radar the 1954 boats were equipped with AN SPS 5B which was made in the United States and used the X band while this model was made in Japan and used the C band 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 Fire Control System GFCS with the director on the bridge top and the fire radar on the gun side In addition the hedgehog Mk 10 anti submarine mortar is placed just before the bridge structure behind it and a 54 type depth charge drop rail 6 depth charges for 1 line is placed on each side of the stern Is However in the 1954 boats an anti submarine short torpedo equipped with a guidance device was adopted instead of the 55 type depth charge projector so called 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 editUmitaka 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 1989Citations edit 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 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 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 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 amp oldid 1149139848, wikipedia, wiki, book, books, library,

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