Type J1 submarine

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:	two 14 cm/40 11th Year Type naval guns fore and aft 8 × 533mm torpedo tubes (6 forward, 2 aft) 20 × type 95 oxygen-driven torpedoes

twin shaft MAN 10 cylinder 4 stroke diesels giving 6000 bhp

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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