Type AM submarine

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Japanese submarine I-14 in 1945.jpg
Class overview
Operators: Imperial Japanese Navy Ensign Imperial Japanese Navy
Preceded by: Type A2 submarine
In service: 1944–45
Planned: 7
Completed: 2
Cancelled: 5
Lost: 1
Scrapped: 1
General characteristics
  • 3,661 tonnes (3,603 long tons) surfaced
  • 4,838 tonnes (4,762 long tons) submerged
Length: 113.7 m (373 ft 0 in) overall
Beam: 11.7 m (38 ft 5 in)
Draft: 5.9 m (19 ft 4 in)
Installed power:
  • 16.75 knots (31.02 km/h; 19.28 mph) surfaced
  • 5.5 knots (10.2 km/h; 6.3 mph) submerged
  • 21,000 nmi (39,000 km; 24,000 mi) at 16 knots (30 km/h; 18 mph) surfaced
  • 60 nmi (110 km; 69 mi) at 3 knots (5.6 km/h; 3.5 mph) submerged
Test depth: 100 m (330 ft)
Crew: 108
Aircraft carried: 2 × Aichi M6A Seiran floatplane
Aviation facilities: 1 × catapult

The Type AM (A Modified) submarine (巡潜甲型改二潜水艦, Junsen kō-gata kai-ni sensuikan, "Cruiser submarine type A modified 2"), also called I-13-class submarine (伊一三型潜水艦, I-jū-san-gata sensuikan) was a pair of large, aircraft-carrying cruiser submarines built for the Imperial Japanese Navy (IJN) during World War II.

Design and description[edit]

The Type AM submarines were versions of the preceding A2 class with the command facilities replaced by an enlarged aircraft hangar, which was fitted for a pair of Aichi M6A1 floatplane bombers.[1] They displaced 3,661 tonnes (3,603 long tons) surfaced and 4,838 tonnes (4,762 long tons) submerged. The submarines were 113.7 meters (373 ft 0 in) long, had a beam of 11.7 meters (38 ft 5 in) and a draft of 5.9 meters (19 ft 4 in). They had a diving depth of 100 meters (330 ft).[2]

The machinery was reduced in power from the A2-class boats. For surface running, the boats were powered by two 2,200-brake-horsepower (1,641 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 300-horsepower (224 kW) electric motor. They could reach 16.75 knots (31.02 km/h; 19.28 mph) on the surface and 5.5 knots (10.2 km/h; 6.3 mph) underwater.[3] On the surface, the AMs had a range of 21,000 nautical miles (39,000 km; 24,000 mi) at 16 knots (30 km/h; 18 mph); submerged, they had a range of 60 nmi (110 km; 69 mi) at 3 knots (5.6 km/h; 3.5 mph).[4]

The boats were armed with six internal bow 53.3 cm (21.0 in) torpedo tubes and carried a total of a dozen torpedoes. They were also armed with a single 140 mm (5.5 in)/40 deck gun and two triple and one single mount for 25 mm (1 in) Type 96 anti-aircraft guns.[4]

In comparison to the A2 class, the aircraft hangar was enlarged to accommodate two aircraft. It was offset to the right of, and was faired into the base of, the conning tower which protruded over the left side of the hull. A single catapult was positioned on the forward deck. Two folding crane on the forward deck were used to recover the floatplanes.[4]


Seven units were ordered, but only two were completed, while construction of two more was abandoned in March 1945. Construction of the remaining three submarines never started.[3]

  • I-13 was sunk on 16 July 1945 by the destroyer escort USS Lawrence C. Taylor and aircraft action from escort carrier USS Anzio about 550 nautical miles (1,019 km) east of Yokosuka.
  • I-14 surrendered at sea at the end of the war, and was scuttled off Oahu in 1946. In 2009, researchers at the Hawaii Undersea Research Laboratory found I-14 at a depth of about 2,600 feet (790 m).[5]
  • I-15 was converted to a tanker submarine in June 1945, 90% complete, scrapped in 1945.
  • I-1 was 70% complete, sunk by a typhoon on 18 September 1945; later salvaged and scrapped.
  • No.5094, No.5095, and No.5096 were cancelled in 1943.

See also[edit]


  1. ^ Layman & McLaughlin, p. 176
  2. ^ Bagnasco, p. 189
  3. ^ a b Chesneau, p. 200
  4. ^ a b c Carpenter & Dorr, p. 110
  5. ^ HENRY FOUNTAIN (November 12, 2009). "2 Sunken Japanese Subs Are Found Off Hawaii". New York Times.


  • Bagnasco, Erminio (1977). Submarines of World War Two. Annapolis, Maryland: Naval Institute Press. ISBN 0-87021-962-6.
  • Boyd, Carl & Yoshida, Akikiko (2002). The Japanese Submarine Force and World War II. Annapolis, Maryland: Naval Institute Press. ISBN 1-55750-015-0.
  • Carpenter, Dorr B. & Polmar, Norman (1986). Submarines of the Imperial Japanese Navy 1904–1945. London: Conway Maritime Press. ISBN 0-85177-396-6.
  • Chesneau, Roger, ed. (1980). Conway's All the World's Fighting Ships 1922–1946. Greenwich, UK: Conway Maritime Press. ISBN 0-85177-146-7.
  • Hashimoto, Mochitsura (1954). Sunk: The Story of the Japanese Submarine Fleet 1942 – 1945. Colegrave, E.H.M. (translator). London: Cassell and Company. ASIN B000QSM3L0.
  • Layman, R.D. & McLaughlin, Stephen (1991). The Hybrid Warship:The Amalgamation of Big Guns and Aircraft. London: Conway Maritime Press. ISBN 0-85177-555-1.
  • Stille, Mark (2007). Imperial Japanese Navy Submarines 1941-45. New Vanguard. 135. Botley, Oxford, UK: Osprey Publishing. ISBN 978-1-84603-090-1.