Shimane Maru-class escort carrier

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Shimane Maru, 28 July 1945
Class overview
Name	Shimane Maru
Builders	Kawasaki Shipbuilding Corporation
Operators	Imperial Japanese Navy
Preceded by	Shinyo
Succeeded by	None
Built	1944–1945
In commission	1945
Planned	4
Completed	1
Cancelled	2
Lost	2
General characteristics
Type	Escort carrier
Tonnage	10,002 gross register tons (GRT)
Displacement	11,989 tonnes (11,800 long tons) (standard)
Length	160.5 m (527 ft) (o/a)
Beam	20 m (66 ft)
Draught	9.1 m (29 ft 10 in) (mean)
Installed power	2 boilers 8,600 shp (6,400 kW)
Propulsion	1 shaft; 1 steam turbine
Speed	18.5 knots (34.3 km/h; 21.3 mph)
Range	10,000 nmi (19,000 km; 12,000 mi) at 10 knots (19 km/h; 12 mph)
Sensors and processing systems	Type 3, Mark 1, Model 3 radar
Armament	2 × single 12 cm (4.7 in) guns 9 × triple, 25 × single 2.5 cm (1 in) AA guns
Aircraft carried	12

The Shimane Maru class was a pair of auxiliary escort carriers built for the Imperial Japanese Navy (IJN) during World War II.

Four additional conversions were reportedly considered but not carried out. Although both ships were launched, only one was completed, and neither entered active service before being destroyed.

The concept of the class was similar to British merchant aircraft carrier. The class consisted of two oil tankers of 10,002 gross register tons (GRT) that were modified by the Navy to provide minimal anti-submarine air cover for convoys going from Southeast Asia to the Japanese homeland. The conversion consisted of fitting a full-length flight deck, a small hangar, and a single elevator. An island and catapults were not installed. The only other change was the rerouting of the boiler uptakes to the aft starboard side where they discharged in a typical downward-facing funnel.

The ships had a length of 160.5 meters (526 ft 7 in) overall and 150 meters (492 ft 2 in) between perpendiculars. They had a beam of 20 meters (65 ft 7 in) at the waterline and a mean draft of 9.1 meters (29 ft 10 in). They displaced 11,989 metric tons (11,800 long tons) at standard load.^[1]

The Shimane Maru-class ships were fitted with a single geared steam turbine set with a total of 8,600 shaft horsepower (6,400 kW). It drove one propeller shaft using steam provided by two boilers. The ships had a designed speed of 18.5 knots (34.3 km/h; 21.3 mph) and a range of 10,000 nautical miles (19,000 km; 12,000 mi) at 10 knots (19 km/h; 12 mph).^[2]

The flight deck was 154.99 meters (508 ft 6 in) long and had a maximum width of 23.01 meters (75 ft 6 in).^[2] The hangar, built on top of the well deck, was served by a single elevator from the flight deck. It had a capacity of a dozen aircraft.^[1]

• She was completed on 28 February 1945, but was sunk 24 July 1945 by British aircraft at Shido Bay, Kagawa Prefecture^[3] at position 34°20′10″N 134°10′15″E / 34.33611°N 134.17083°E / 34.33611; 134.17083. Her hulk was also mined, then scrapped at Naniwa in 1948.
• Her construction was 70% completed when she drifted onto a mine on 25 August 1945 and sank. Her hulk was scrapped at Kobe in 1948.
• Daiju Maru (大邱丸) - Laid down by Kawasaki on 18 December 1944, construction stopped in February 1945. Constructions were restarted and sold to Iino Lines K.K. on 19 October 1949, and renamed Ryūhō Maru (隆邦丸). Scrapped at Yokosuka in May 1964.
• Taisha Maru (大社丸) - Cancelled in 1944.

• 
  Shimane Maru in postwar
• 
  3rd sister Ryūhō Maru (ex.-Daiju Maru) in postwar

• Chesneau, Roger (1995). Aircraft Carriers of the World, 1914 to the Present: An Illustrated Encyclopedia (New, revised ed.). Annapolis, Maryland: Naval Institute Press. ISBN 0-87021-902-2.
• Fukui, Shizuo (1991). Japanese Naval Vessels at the End of World War II. London: Greenhill Books. ISBN 1-85367-125-8.
• Jentschura, Hansgeorg; Jung, Dieter & Mickel, Peter (1977). Warships of the Imperial Japanese Navy, 1869–1945. Annapolis, Maryland: United States Naval Institute. ISBN 0-87021-893-X.
• Lengerer, Hans (2023). The Aircraft Carriers of the Imperial Japanese Navy and Army: Technical and Operational History. Vol. II. Katowice, Poland: Model Hobby. ISBN 978-83-60041-71-0.
• Polmar, Norman; Genda, Minoru (2006). Aircraft Carriers: A History of Carrier Aviation and Its Influence on World Events. Vol. 1, 1909–1945. Washington, D.C.: Potomac Books. ISBN 1-57488-663-0.
• Sturton, Ian (1980). "Japan". In Chesneau, Roger (ed.). Conway's All the World's Fighting Ships 1922–1946. Greenwich, UK: Conway Maritime Press. pp. 167–217. ISBN 0-85177-146-7.
• The Maru Special, Japanese Naval Vessels No. 38, Japanese aircraft carriers II, Ushio Shobō (Japan)