Kamishima-class minelayer

The Kamishima-class minelayer (神島型敷設艇,, Kamishima-gata Fusetsutei) was a class of minelayers of the Imperial Japanese Navy (IJN), serving during and after World War II. Nine vessels were planned under the Maru Sen Programme; however, only one vessel was completed by the end of war.

Kamishima in 1947
Class overview
Name	Kamishima class
Builders	Sasebo Naval Arsenal Kawanami Kōgyō Corporation
Operators	Imperial Japanese Navy  Soviet Navy
Preceded by	Ajiro class
Built	1945–1946
In commission	1945–1947
Planned	9
Completed	2
Cancelled	7
Retired	2
General characteristics
Type	Minelayer
Displacement	766 long tons (778 t) standard
Length	74.50 m (244 ft 5 in) overall
Beam	7.85 m (25 ft 9 in)
Draught	2.60 m (8 ft 6 in)
Propulsion	Kamishima 2 × Kampon Mk.23B Model 8 diesels, 2 shafts, 1,900 bhp (1,400 kW) Awashima 2 × MAN Mk.3 Model 10 diesels, 2 shafts, 3,600 bhp (2,700 kW)
Speed	Kamishima 16.5 knots (30.6 km/h; 19.0 mph) Awashima 19.5 knots (36.1 km/h; 22.4 mph)
Range	Kamishima 3,000 nmi (5,600 km; 3,500 mi) at 14 kn (26 km/h; 16 mph)
Complement	Kamishima 94
Armament	Kamishima, 1945 2 × Type 5 40 mm L/65 AA guns 16 × Type 96 25 mm AA guns 36 × Type 2 depth charges 120 × Type 93 naval mines 4 × Type 3 depth charge projectors 8 × depth charge throwers 1 × 22-Gō surface search radar 1 × 13-Gō early warning radar 2 × Type 3 active sonars 1 × Type 93 hydrophone 1 × Paravane

Background

By the end of 1944, Japanese sea lanes were cut apart by United States Navy. The IJN focused on securing the Sea of Japan. Therefore, the IJN had to lay naval mines in La Pérouse Strait, Tsugaru Strait, and Tsushima Strait. However, the IJN had already lost all of its minelayers. The IJN planned to build two kinds of minelayers. One was the large Minoo class; the other was the smaller Kamishima class.

Design

The Navy Technical Department (Kampon) revised the Hirashima's drawings, and gave it the armaments intended for escort ships (or kaibōkan). Their Type 5 40 mm AA was the latest anti-aircraft gun in the Imperial Japanese Army and Navy. It was a Japanese version of the Bofors 40 mm.

Ships in class

Ship #	Ship	Builder	Laid down	Launched	Completed	Fate
1801	Kamishima (神島)	Sasebo Naval Arsenal	20 February 1945	12 June 1945	30 July 1945	Decommissioned 5 September 1945. Surrendered to Soviet Union at Nakhodka, 3 October 1947.
1802	Awashima (粟島)	Sasebo Naval Arsenal[1]	20 February 1945	26 July 1945	18 April 1946	Incomplete until the end of the war (90%). Surrendered to United States on 1 October 1947. Sunk as target at 35°24′N 123°53′E on 7 October 1947.
1803 - 1806						Cancelled in May 1945.
1807	Hikoshima (彦島)	Sasebo Naval Arsenal
1808 - 1809