NAVYPEDIA

Ships

Name	No	Yard No	Builder	Laid down	Launched	Comp	Fate
伊13 [I13]			Kawasaki, Kobe	2/1943	30.11.1943	12.1944	sunk 16.7.1945
伊14 [I14]			Kawasaki, Kobe	5/1943	14.3.1944	3.1945	surrendered 8.1945, BU 1946
伊15 [I15]			Kawasaki, Kobe	4/1943	12.4.1944	---	BU incomplete 1946
伊1 [I1]			Kawasaki, Kobe	6/1943	10.6.1944	---	BU incomplete 1947

Technical data

Displacement standard, t	2620
Displacement normal, t	3603 / 4762
Length, m	108.4 pp 112.0 wl 113.7 oa
Breadth, m	11.7
Draught, m	5.89
No of shafts	2
Machinery	2 Kampon diesels / 2 electric motors
Power, h. p.	4400 / 600
Max speed, kts	16.7 / 5.5
Fuel, t	diesel oil 180
Endurance, nm(kts)	21000(16) / 60(3)
Armament	1 x 1 - 140/40 11-shiki, 2 x 3 - 25/60 96-shiki, 1 x 1 - 25/60 96-shiki, 6 - 533 TT (bow,12), 1 catapult, 2 seaplanes (M6A1)
Electronic equipment	2-shiki 2-go radar, 93-shiki sonar, 93-shiki hydrophone, E27 ECM suite
Complement	114
Diving depth operational, m	100

Project history

Kai-Ko-Taka Am (Ko-gata modified) type. Built under the 1941 War programme. Originally I13-15 should be laid down under design Ko-Gata A1, but later were re-ordered (together with the fourth submarine I1) under the advanced design on the basis of Ko-Gata A2: it was supposed to equip them not with one, but two seaplanes, and not reconnaissance, as on all previous classes, but attack Aichi M6A Seiran (it was planed to operate against Panama canal by these seaplanes). For placing of these much larger planes it was necessary to redesign full complex "CT-hangar" completely. A new cylindrical hangar with light radome was slightly shifted to starboard side, and CT to port, that has given to submarines of this class enough original appearance. Fwd from "CT-hangar" complex powerful pneumatic catapult was installed. There were two cranes at each side to handling aircrafts. Cost of increasing of aviation armament was still more, in comparison with original design, decrease of engine power. Double-hulled. Endurance was about 90 days.

Building of I1 and I15 was suspended in March, 1945 at 70% and 90% availability respectively. Under the additional 1942 programme building of 4 further submarines of this class was provided (Nos 5094-5096), but works did not start.

Modernizations

None.

Naval service

I13 was sunk 16.7.1945 E off  Yokosuka by US escort destroyer Lawrence С. Taylor and carrier aircraft (Anzio air group).