# Type A Mod.2 submarine

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For other ships named Japanese submarine I-1, see [Japanese submarine I-15](/source/Japanese_submarine_I-15).

The **Type *A Kai 2* (A Modified 2) 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](/source/Cruiser_submarine) built for the [Imperial Japanese Navy](/source/Imperial_Japanese_Navy) (IJN) during World War II.

## Design and description

The Type A Mod.2 submarines were versions of the preceding [A2 class](/source/Type_A2_submarine) with the command facilities replaced by an enlarged aircraft [hangar](/source/Hangar), which was fitted for a pair of [Aichi M6A1](/source/Aichi_M6A) [floatplane](/source/Floatplane) bombers.[1] They [displaced](/source/Displacement_(ship)) 3,661 t (3,603 long tons) surfaced and 4,838 t (4,762 long tons) submerged. The submarines were 113.7 meters (373 ft 0 in) long, had a [beam](/source/Beam_(nautical)) of 11.7 meters (38 ft 5 in) and a [draft](/source/Draft_(hull)) 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-horsepower (1,641-kilowatt) [diesel engines](/source/Diesel_engine), each driving one [propeller shaft](/source/Propeller_shaft). When submerged each propeller was driven by a 300-horsepower (224-kilowatt) [electric motor](/source/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 *AM*s 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](/source/Torpedo_tube) and carried a total of a dozen [torpedoes](/source/Torpedo). They were also armed with a single [140 mm (5.5 in)/40](/source/14_cm/40_11th_Year_Type_naval_gun) [deck gun](/source/Deck_gun) and two triple and one single mount for [25 mm (1 in) Type 96](/source/Type_96_25_mm_AT/AA_Gun) [anti-aircraft guns](/source/Anti-aircraft_gun).[4]

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

### Name Translation

Sources also refer to this class of ships as the **"Type AM"** (standing for the "Type A Modified"), or "Type AM2" (for "Type A Modified 2"), contrasting with two other sub-classes of the type, the [*I-9*-class (Type A/*A1*)](/source/Type_A1_submarine) and [*I-12*-class (Type AM1/*A2*)](/source/Type_A2_submarine). As the I-12 submarine was only a minor evolution of the *I-9*-class as well as being the sole ship of its class, it may also be considered as part of the *I-9*-class, making the *I-13*-class the only sub-class of the type, hence the *I-9*-class "Type A" and the *I-13*-class of the "Type AM".

**"Type AM"** might also be a miss-translation of *Kai Ni* (改二) (equivalent to 2nd remodel/modification) being interpreted as "Mark 2" in the sense of the 1st remodel/modification.

As the original Japanese name (*Junsen kō-gata kai-ni sensuikan* (巡潜甲型改二潜水艦)) is better translated as either **"Type A Mod.2 Submarine Cruiser"** or **"Junsen Type A Kai 2 Submarine "**, the **"Type A Mod.2"** designation is used here.

## Boats

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]

- [Japanese submarine *I-13*](/source/Japanese_submarine_I-13) was sunk on 16 July 1945 by the destroyer escort [USS *Lawrence C. Taylor*](/source/USS_Lawrence_C._Taylor_(DE-415)) and aircraft action from escort carrier [USS *Anzio*](/source/USS_Anzio_(CVE-57)) about 550 nautical miles (1,019 km) east of [Yokosuka](/source/Yokosuka).
- [Japanese submarine *I-14*](/source/Japanese_submarine_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](/source/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

- [I-400 class submarine](/source/I-400_class_submarine) - 3-aircraft submarine with catapult launcher
- [Submarine aircraft carrier](/source/Submarine_aircraft_carrier)

## Notes

1. Layman & McLaughlin, p. 176

1. Bagnasco, p. 189

1. Chesneau, p. 200

1. Carpenter & Dorr, p. 110

1. HENRY FOUNTAIN (November 12, 2009). ["2 Sunken Japanese Subs Are Found Off Hawaii"](https://www.nytimes.com/2009/11/13/science/13wreck.html). *New York Times*

## References

- 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.
- *Conway's All the World's Fighting Ships 1922–1946*. Greenwich, UK: Conway Maritime Press. 1980. ISBN 0-85177-146-7.
- Hashimoto, Mochitsura (1954). *Sunk: The Story of the Japanese Submarine Fleet 1942 – 1945*. 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*. Vol. 135. New Vanguard. Botley, Oxford, UK: Osprey Publishing. ISBN 978-1-84603-090-1.

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Adapted from the Wikipedia article [Type A Mod.2 submarine](https://en.wikipedia.org/wiki/Type_A_Mod.2_submarine) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Type_A_Mod.2_submarine?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.