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I176 1942  

Ships

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

Technical data

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

Standard scale images

Graphics

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.