W-7 class
Mine sweeper number 7 in September 1942
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The W-7 class ( Jap. 第七号型掃海艇 , Dai Nana GO-gata Sōkaitei , dt "No.7 class minesweeper.") Was a class of six minesweepers the Imperial Japanese Navy , which in World War II for Use came.
List of ships
Construction no. | Surname | Shipyard | Keel laying | Launch | Commissioning | Whereabouts |
---|---|---|---|---|---|---|
49 |
Dai-7-go Sōkaitei ( 第七号掃海艇 ) minesweeper No.7 |
Mitsui Zosen , Tamano |
October 27, 1937 | June 16, 1938 | December 15, 1938 | sunk on April 15, 1944 by the British submarine HMS Storm , off the Andamans |
50 |
Dai-8-GO Sōkaitei ( 第八号掃海艇 ) minesweeper No.8 |
Uraga shipyard, Yokosuka |
December 11, 1937 | May 28, 1938 | February 15, 1939 | Spoils of war Great Britain, sunk on July 13, 1946 in the Strait of Malacca |
51 |
Dai-9-Gō Sōkaitei ( 第九号掃海艇 ) minesweeper No.9 |
Maizuru naval shipyard | February 7, 1938 | September 10, 1938 | February 15, 1939 | sunk after being hit by a mine on February 1, 1942, off the island of Ambon |
52 |
Dai-10-Gō Sōkaitei ( 第十 号 掃 海 艇 ) minesweeper number 10 |
Ishikawajima Zosen , Tokyo |
December 21, 1937 | September 22, 1938 | February 15, 1939 | sunk on December 10, 1941 by air raid, off Vigan ( Japanese invasion of the Philippines ) |
53 |
Dai-11-Gō Sōkaitei ( 第十一 号 掃 海 艇 ) minesweeper number 11 |
Uraga shipyard, Yokosuka |
May 30, 1938 | December 28, 1938 | July 15, 1939 | sunk on March 28, 1945 by air raid in Makassar |
54 |
Dai-12-go Sōkaitei ( 第十二号掃海艇 ) minesweeper No.12 |
Ishikawajima Zosen, Tokyo |
May 28, 1938 | February 18, 1939 | August 15, 1939 | sunk on April 15, 1944 by americans USS Besugo submarine , off Flores Island |
technical description
hull
The hull of the boats of the W-7 class was 72.27 meters long, 7.96 meters wide and had a draft of 2.6 meters with an operational displacement of 762 tons .
drive
It was driven by two steam generators - Kampon boilers of the Yarrow type - and two geared turbine sets with which a total output of 3,850 hp (2,832 kW ) was achieved. The power was delivered to two shafts with one screw each . The top speed was 20 knots (37 km / h ). The maximum travel distance was 2,000 nautical miles (3,704 km) at 14 knots.
crew
The crew had a strength of 88 men.
Armament
artillery
The artillery armament consisted of three 12 cm guns with a caliber length of 45 in single mounts. From 1944, one gun was given ashore and replaced by anti-aircraft guns.
Air defense
For air defense two 2.5 cm were machine guns Type 96 available.
Due to the threat posed by the Allied forces during the Pacific War , the anti-aircraft armament of all remaining boats was reinforced in 1944. The armament now consisted of nine 2.5 cm automatic cannons, which were distributed over the boat.
Submarine hunting equipment
The anti-submarine armament consisted of a Y- type 94 depth charge launcher with 18 depth charges, which were located on the quarterdeck. From 1944 the number of depth charges was increased to up to 36, which could now be used through two drainage rails and the launchers.
Mine detection equipment
For mechanical rooms of sea mines ( moored mines ) possessed the class over Minenräumgeschirr consisting of Räumottern (engl. Paravanes) which by means of two davits were drained at the stern. These clearing otters were pulled to the side by the towing vehicle and held at the same height by wings. The taut towing cable could now lead the anchor ropes from the anchor mine to the clearing otter, where it was cut by cable cutters and the mine floated. It could then be detonated using handguns or ship artillery. If the anchor rope was not cut, the mine and the clearing otter would collide and explode. The towing cable could then be retrieved and any existing replacement device could be attached. Up to six clearing otters were carried on board.
Sensors
sonar
To search for submarines one was echolocation system of the type 93 and a hydrophone -Set the Type 93 scaffolded. This hydrophone set consisted of two groups of eight sensors each, one group on each side of the boat.
See also
literature
- Harald Fock: Fleet Chronicle - The active warships involved in the two world wars and their whereabouts . Koehlers Verlagsgesellschaft, Hamburg 2000, ISBN 3-7822-0788-2 , p. 173-200 .
- Hansgeorg Jentschura, Dieter Jung, Peter Mickel: Warships of the Imperial Japanese Navy 1869-1945 . US Naval Institute Press, Annapolis 1977, ISBN 0-87021-893-X , pp. 209 (English).
Web links
- Japanese mine layers and mine hunters on ww2technik.de
- Minesweeper on combinedfleet.com (English)
- W-7 class on combinedfleet.com (English)
Individual evidence
- ↑ Japanese depth charges in WWII. In: navweaps.com. Retrieved July 1, 2020 .
- ↑ Japanese Sonar and Asdic (USNTMJ E-10). (PDF) US Navy Technical Mission to Japan, December 14, 1945, pp. 7 and 11 , accessed on July 1, 2020 .