I176 1943
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| 伊176 [I176] (ex-伊76 [I76]) | Kure K K | 6/1940 | 7.6.1941 | 8.1942 | sunk 16.5.1944 | ||
| 伊177 [I177] (ex-伊77 [I77]) | Kawasaki, Kobe | 3/1941 | 20.12.1941 | 12.1942 | sunk 3.10.1944 | ||
| 伊178 [I178] (ex-伊78 [I78]) | Mitsubishi, Kobe | 5/1941 | 24.2.1942 | 12.1942 | sunk 29.5.1943 | ||
| 伊179 [I179] (ex-伊79 [I79]) | Kawasaki, Kobe | 8/1941 | 16.7.1942 | 6.1943 | foundered 14.7.1943 | ||
| 伊180 [I180] (ex-伊80 [I80]) | Yokosuka K K | 4/1941 | 7.2.1942 | 1.1943 | sunk 26.4.1944 | ||
| 伊181 [I181] (ex-伊81 [I81]) | Kure K K | 11/1941 | 2.5.1942 | 5.1943 | sunk 16.1.1944 | ||
| 伊182 [I182] (ex-伊82 [I82]) | Yokosuka K K | 11/1941 | 30.5.1942 | 5.1943 | sunk 1.9.1943 | ||
| 伊183 [I183] (ex-伊83 [I83]) | Kawasaki, Kobe | 12/1941 | 21.1.1943 | 10.1943 | sunk 28.4.1944 | ||
| 伊184 [I184] (ex-伊84 [I84]) | Yokosuka K K | 4/1942 | 12.12.1942 | 10.1943 | sunk 19.6.1944 | ||
| 伊185 [I185] (ex-伊85 [I85]) | Yokosuka K K | 2/1942 | 16.9.1942 | 9.1943 | sunk 22.6.1944 |
|
Displacement standard, t |
1630 |
|
Displacement normal, t |
1833 / 2602 |
|
Length, m |
98.6 pp 102.6 wl 105.5 oa |
|
Breadth, m |
8.25 |
|
Draught, m |
4.60 |
|
No of shafts |
2 |
|
Machinery |
2 Kampon diesels / 2 electric motors |
|
Power, h. p. |
8000 / 1800 |
|
Max speed, kts |
23.1 / 8 |
|
Fuel, t |
diesel oil 135 |
| Endurance, nm(kts) | 8000(16) / 50(5) |
| Armament |
I176 - 178, 180 - 185: 1 x 1 - 120/45 11-shiki, 1 x 2 - 25/60 96-shiki, 6 - 533 TT (bow, 12) I179: 1 x 1 - 120/45 11-shiki, 2 x 2 - 25/60 96-shiki, 6 - 533 TT (bow, 12) |
| Electronic equipment | 93-shiki sonar, 93-shiki hydrophone |
|
Complement |
88 |
|
Diving depth operational, m |
80 |
Project history: Kaidai 7 (Large Admiralty 7) type. Built under 4th Supplementary programme of 1939. Design was created on the basis of Kaidai 6 type with entering of minor alterations. Engine power and endurance are a little lowered, all TTs are arranged in a fore end. Under the design it supposed to limit artillery to 2 twin 25mm MGs, however during building designers returned to usual 120mm/45 guns. Double-hulled, endurance was 75 days.
The 1942 programme assumed building of 10 more submarine of this type (Nos I-X), but order was not been given out.
Modernizations: 1942 - 1943, I176, 177, 181: were converted to transport submarines; - 1 x 1 - 120/45, torpedoes stowage was decreased; + 1 14m Daihatsu-type landing craft and deck cargo.
1943-1944, some survived: + 2-shiki 2-go radar
Naval service: I178 was sunk 8.5.1943 W off Espirito Santo by US submarine chaser SC669. I179 was foundered 14.7.1943 during training diving in Internal Sea of Japan, salvaged in 1957 and used for tests. I182 was lost after 22.8.1943 (presumably sunk 1.9.1943 off Espirito Santo by US destroyer Wadsworth). I181 was sunk 16.1.1944 off New Guinea by US ships. I180 was sunk 26.4.1944 SW off Kadiak (Aleuts) by US escort destroyer Gilmore. I183 was sunk off Shikoku 29.4.1944 by US submarine Pogy. I176 was sunk 16.5.1944 between New Guinea and Buka Islands by US destroyers Franks, Haggard and Johnston. I184 was sunk 19.6.1944 SE off Guam by US carrier aircraft. I185 was sunk 22.6.1944 NE off Saipan by US destroyers Newcomb and Chandler. I177 was sunk 3.10.1944 on approaches to Palau by US escort destroyer Samuel S. Miles.
I176 1942
© Ivan Gogin, 2008-14