 I-1 in 1930 | |
| Class overview | |
|---|---|
| Operators |  Imperial Japanese Navy |
| Succeeded by | Type J1M submarine |
| In service | 1926 - 1944 |
| Completed | I-1, I-2, I-3, I-4 |
| General characteristics | |
| Displacement | 2135 tons (surfaced) 2,791 tons (submerged) |
| Length | 320 ft (98 m) |
| Beam | 30 ft (9.1 m) |
| Draught | 16.5 ft (5.0 m) |
| Propulsion | twin shaft MAN 10 cylinder
4 stroke diesels giving 6000 bhp two electric motors of 2600 ehp |
| Speed | 18 knots (surface) 8 knots (submerged) |
| Range | 24,400 nm at 10 knots |
| Test depth | 80 m (260 feet) |
| Complement | 68 officers and men |
| Armament |
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The Type J1 submarine (巡潜1型潜水艦, Junsen ichi-gata sensuikan, "Cruiser submarine Type 1"), also called I-1-class submarine (伊一型潜水艦, I-ichi-gata sensuikan) were large cruiser submarines (Junsen type submarines) of the Imperial Japanese Navy.
Four boats were built between 1926 and 1929. These boats, based on the KD2 and U-139 designs, were of a junsen, or cruiser, type with an impressive range of 24,000 nm. Elderly by 1941 they were among the first Japanese submarines converted to supply duty.
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