1-go 1905
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| 第1号艦 [1-go] | 123 | Fore River, Quincy, USA | 1904 | 30.3.1905 | 8/1905 | stricken 1921 | |
| 第2号艦 [2-go] | 124 | Fore River, Quincy, USA | 1904 | 2.5.1905 | 9/1905 | stricken 1921 | |
| 第3号艦 [3-go] | 125 | Fore River, Quincy, USA | 1904 | 16.5.1905 | 9/1905 | stricken 1921 | |
| 第4号艦 [4-go] | 126 | Fore River, Quincy, USA | 1904 | 27.5.1905 | 10/1905 | stricken 1921 | |
| 第5号艦 [5-go] | 127 | Fore River, Quincy, USA | 1904 | 13.5.1905 | 10/1905 | stricken 1921 |
|
Displacement standard, t |
|
|
Displacement normal, t |
103 / 124 |
|
Length, m |
20.4 oa 18.3 pp |
|
Breadth, m |
3.60 |
|
Draught, m |
3.10 |
|
No of shafts |
1 |
|
Machinery |
1 4-cyl gasoline engine / 1 electric motor |
|
Power, h. p. |
180 / 70 |
|
Max speed, kts |
8 / 7 |
|
Fuel, t |
petrol 2 |
| Endurance, nm | 184(8) / 21(7) |
| Armament |
1 - 450 TT (bow, 2) |
|
Complement |
13 |
|
Diving depth operational, m |
30 |
Project history: The first Japanese submarines, they were ordered from the Fore River Co (Holland company design) in 1902, after a Japanese naval mission visited Britain, France, and the United States. Built in great secrecy, they were sent disassembled by rail to Seattle, thence onboard to Yokosuka, where they arrived 12 December 1904. Assembly was delayed; they were launched only in March and May 1905, the first being ready in June 1905. They differ from contemporary boats in greater hull strength, reinforced by a broad strip of bronze plating. Two bilge keels, 7.5x2.9m, also stiffened the hull to resist pressure at a maximum diving depth of 38m. Similar to USN 'A' class, single-hulled.
Modernizations: None.
Naval service: 4-go sank at Kure by petrol explosion on 14 November 1916 but was raised and repaired.
1-go 1905
Many thanks to Wolfgang Stöhr for additional information on this page.
© Ivan Gogin, 2014