Kaidai class submarine
| Class overview | |
|---|---|
| Name: | Kaidai type submarine |
| Builders: | |
| Operators: |
 Imperial Japanese Navy
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| Subclasses: |
|
| Built: | 1921-1943 |
| In commission: | 1924-1945 |
I-65 in 1932
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|
| Class overview | |
|---|---|
| Built: | 1929-1932 |
| In commission: | 1932-1945 |
| Completed: | 3 |
| Lost: | 3 |
| General characteristics | |
| Displacement: |
|
| Length: | 97.70 m (320 ft 6 in) |
| Beam: | 8.20 m (26 ft 11 in) |
| Draught: | 4.70 m (15 ft 5 in) |
| Propulsion: |
|
| Speed: |
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| Range: |
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| Test depth: | 75.0 m (246.1 ft) |
| Complement: | 62 |
| Armament: |
6 × 533 mm (21 in) torpedo tubes (4 × bow, 2 × aft) • 14 × Type 89 torpedoes • 1 × 100 mm (3.9 in) L/50 Type 88 AA gun • 1 × 12.7 mm AA gun • 1 × 7.7 mm MG |
| Notes: | 230 tons fuel |
I-176 in 1942
|
|
| Class overview | |
|---|---|
| Built: | 1939-1943 |
| In commission: | 1942-1944 |
| Planned: | 10 |
| Lost: | 10 |
| General characteristics | |
| Displacement: |
|
| Length: | 105.50 m (346 ft 2 in) |
| Beam: | 8.25 m (27 ft 1 in) |
| Draft: | 4.60 m (15 ft 1 in) |
| Propulsion: |
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| Speed: |
|
| Range: |
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| Test depth: | 80 m (260 ft) |
| Complement: | 86 |
| Armament: |
|
| Notes: | 354.7 tons fuel |
The Kaidai type submarine (海大型潜水艦 Kaidai-gata sensuikan?) was a type of 1st class submarine operated by the Imperial Japanese Navy (IJN) before and during World War II. The type name, was shortened to Kaigun-shiki Ōgata Sensuikan (海軍式大型潜水艦 Navy Large Type Submarine?).
All Kaidai-class submarines originally had a two digit boat name, from I-51 onwards. On 20 May 1942, all Kaidai submarines added a '1' to their name. For example, I-52 became I-152. Ships are listed by the three digit boat name if they had one, two digit if they were not granted one or left service before 20 May 1942.
The Kaidai type submarines were divided into seven classes and two sub-classes:
Project number S22. The prototype for the class. The sole Kaidai I, I-51, was based on World War I-era German submarines. She was completed in 1924, refitted with new engines in 1932 and scrapped in 1941. I-51 never saw combat.
Project number S25. There was only 1 Kaidai II, I-152 planned under the Eight-six fleet together with the I-51. She was completed in 1924, used as a training vessel until mid-1942, then struck from service. She was scrapped in 1946.
Project number S26 (Kaidai IIIa) and S27 (Kaidai IIIb). The nine Kaidai IIIs were based on earlier designs, but featured a strengthened hull. The "IIIb" types were 40 cm longer and had a different bow design. All nine boats were constructed between 1927 and 1930.
Of the nine Kaidai IIIs, seven survived the war, as they spent much of their time as training vessels. These were scuttled or scrapped shortly after the end of World War II. I-63 was sunk in a collision with I-60 in 1939, the former losing all her crew. I-63 was refloated and scrapped in 1940. I-60 was later sunk by HMS Jupiter.
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