|Name||No||Yard No||Builder||Laid down||Launched||Comp||Fate|
|伊9 [I9]||Kure K K||1/1938||20.5.1939||2.1941||sunk 11.6.1944|
|伊10 [I10]||Kawasaki, Kobe||6/1938||20.9.1939||10.1941||sunk 4.7.1944|
|伊11 [I11]||Kawasaki, Kobe||4/1940||28.2.1941||5.1942||sunk 11.1.1944|
|Displacement standard, t||
|Displacement normal, t||
2934 / 4149
108.4 pp 112.0 wl 113.7 oa
|No of shafts||
2 Kampon diesels / 2 electric motors
|Power, h. p.||
12400 / 2400
|Max speed, kts||
23.5 / 8
diesel oil 220
|Endurance, nm(kts)||16000(16) / 60(3)|
1 x 1 - 140/40 11-shiki, 2 x 2 - 25/60 96-shiki, 6 - 533 TT (bow,18), 1 catapult, 1 seaplane (E14Y1)
|Electronic equipment||93-shiki sonar, 93-shiki hydrophone|
|Diving depth operational, m||100|
Ko-Gata A1 type. Three submarines of "model A" (Ko-Gata) were built under 3rd (1937) and 4th (1939) Supplementary programmes. Design was developed on the basis of Junsen 3 type cruiser submarine. Intended for usage both in a role of flag ships of submarine task forces and for a retranslating of radio messages of ship groups operating at great distance from bases, were equipped with powerful radio translating equipment. In comparison with previous Junsen 3 type, location of aviation armament was changed: from stern it have transferred to fore end, seaplanes launched fwd by the course. Watertight spacy hangar has been fulfilled in common complex with CT. Double-hulled, endurance was about 90 days.
4 more submarines of this type, provided by the 1939 programme, have refused and reordered under other designs. Also two submarines included in the 1942 programme (Nos 700 and 701) have not been laid.
1943-1944, some survived: + 2-shiki 2-go radar
I11 after 11.1.1944 was lost in Samoa area (possibly mined). I9 was lost in Aleutian area (possibly sunk 13.6.1944 at Kiska by US destroyer Frazier). I10 was sunk in Saipan area 4.7.1944 by US destroyer David W. Taylor and escort destroyer Riddle.