The Mikura-class kaibōkan, as with the torpedo boat, was a consequence of the 1930 London Naval Treaty, which placed limitations on the total destroyer tonnage the Imperial Japanese Navy was permitted. One way in which the treaty could be circumvented was to use a loophole in the treaty which permitted ships of between 600 and 2,000 tons, with no more than four guns over 76mm, no torpedoes, and with a maximum speed of no more than 20 knots. A new class of vessel was designed to use this loophole, and was given the obsolete designation of kaibōkan (Kai = sea, ocean, Bo = defence, Kan = ship), which had previously been used to designate obsolete battleships which had been reassigned to coastal defense duties. The first of these vessels were the and ; however, after the start of the Pacific War, it became apparent that a design more capable of anti-submarine warfare was needed. The 1941 Rapid Naval Armaments Supplement Programme authorized eight of these new vessels, which were designated the Mikura-class. [1]
Production began in late 1942 concurrently with later Etorofu-class vessels.[1]
Although the Mikura-class was based on the two previous classes of escort vessels and used a simplified version of the Etorofu-class hull, it presented a much different appearance, with a stepped bridge, smaller single smokestack located further aft, shape of the aft deckhouse, and the type of main gun.[1]
The ships measured 77.7m (254.9feet) overall, with a beam of 9.1m (29.9feet) and a draft of 3.05m (10.01feet).[2] They displaced 940sp=usNaNsp=us at standard load and 955sp=usNaNsp=us at deep load. The ships had two diesel engines, each driving one propeller shaft, which were rated at a total of 4400bhp for a speed of 19.5kn. The ships had a range of 5000nmi at a speed of .[3]
The main battery of the Mikura-class consisted of three Type 10 120 mm AA guns — one in a enclosed turret forward and two in an open twin mount aft. These were dual-purpose guns capable of attacking both surface and aircraft targets. Anti-aircraft protection was by four Type 96 251NaN1 anti-aircraft guns in two twin-gun mounts abreast the bridge. The Mikura class was initially armed with 120 Type 95 depth charges with two Type 94 depth charge launchers and had a Model 93 sonar and a Type 93 hydrophone. [1]
Later in the war, a third Type 94 depth charge launcher was added on the stern and the paravanes were removed. During the Pacific War, the number of Type 96 anti-aircraft guns was increased with the addition of a triple-mount in front of the bridge and an additional four single-mounts. A Type 22 and a Type 13 radar were also added. A Type 97 811NaN1 trench mortar was also installed front of the bridge[3]
All eight vessels in the class saw extensive combat service in the South China Sea and the East China Sea, where they were used for convoy escort. Two American submarines may have been destroyed by Mikura-class vessels, with Chiburi given credit for the sinking of on 8 November 1944 and Mikura given credit for assisting in the destruction of on March 28, 1945. Of the eight vessels in the class, five were lost in combat (four to USN submarines). One ship survived the war to be used for repatriation duties and one was given as a reparations to the Republic of China Navy, under whose flag it continued to serve until scrapped in 1963.
| Number | Kanji | Name | Builder | Laid down | Launched | Completed | Fate |
|---|---|---|---|---|---|---|---|
| 御蔵 | NKK-Tsurumi Shipyards | 1 October 1942 | 16 July 1943 | 31 October 1943 | Sunk by on 28 March 1945, SW of Shikoku [31-45N, 131-45E] | |
| 三宅 | NKK-Tsurumi Shipyards | 12 February 1943 | 30 August 1943 | 30 November 1943 | Scrapped 2 July 1948 | |
| 淡路 | Hitachi-Sakurajima Shipyards | 1 June 1943 | 30 October 1943 | 25 January 1944 | Sunk by on 2 June 1944, Bashi Strait [22-34N, 121-51E] | |
| 能美 | Hitachi-Sakurajima Shipyards | 10 August 1943 | 3 December 1943 | 28 February 1944 | Sunk by on 14 April 1945, NW of Jeju Island [33-25N, 126-15E] | |
| 倉橋 | NKK-Tsurumi Shipyards | 1 June 1943 | 15 October 1943 | 19 February 1944 | Ceded to UK in 1947, scrapped 1948 | |
| 千振 | NKK-Tsurumi Shipyards | 20 July 1943 | 30 November 1943 | 3 April 1944 | Sunk by USN aircraft 12 January 1945 off Cape St. Jacques [10-20N, 107-50E] | |
| 屋代 | Hitachi-Sakurajima Shipyards | 18 November 1943 | 16 February 1944 | 10 May 1944 | Ceded to Republic of China Navy 29 August 1947, renamed Cheng An, scrapped 1963 | |
| 草垣 | NKK-Tsurumi Shipyards | 7 September 1943 | 12 January 1944 | 1 July 1944 | Sunk by on 14 April 1945, Off Capones Island, Luzon [14-50N, 119-57E] | |