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fighting ships of the world

IMPERIAL JAPANESE NAVY (JAPAN)

SUBMARINES

"Kaichu 6" coastal submarines (1943-1944)

RO35 1943

Name No Yard No Builder Laid down Launched Comp Fate
35 <RO35>     Mitsubishi, Kobe 10/1941 4/6/1942 3/1943 sunk 25/8/1943
36 <RO36>     Mitsubishi, Kobe 3/1942 14/10/1942 5/1943 sunk 13/6/1944
37 <RO37>     Mitsubishi, Kobe 10/1941 30/6/1942 6/1943 sunk 22/1/1944
38 <RO38>     Mitsubishi, Kobe 6/1942 24/12/1942 7/1943 sunk 24/11/1943
39 <RO39>     Sasebo K K 8/1942 6/3/1943 9/1943 sunk 2/2/1944
40 <RO40>     Mitsubishi, Kobe 8/1942 6/3/1943 9/1943 sunk 16/2/1944
41 <RO41>     Mitsubishi, Kobe 10/1942 5/5/1943 11/1943 sunk 23/3/1945
42 <RO42>     Sasebo K K 4/1942 25/10/1942 8/1943 sunk 11/6/1944
43 <RO43>     Mitsubishi, Kobe 10/1942 5/6/1943 12/1943 sunk 26/2/1945
44 <RO44>     Tamano Zosen, Tamano 2/1942 11/11/1942 9/1943 sunk 16/6/1944
45 <RO45>     Mitsubishi, Kobe 10/1942 21/7/1943 1/1944 sunk 30/4/1944
46 <RO46>     Mitsubishi, Kobe 6/1942 23/4/1943 2/1944 sunk 18/4/1945
47 <RO47>     Tamano Zosen, Tamano 12/1942 20/8/1943 1/1944 sunk 25/9/1944
48 <RO48>     Mitsubishi, Kobe 3/1942 15/10/1943 3/1944 sunk 14/7/1944
49 <RO49>     Tamano Zosen, Tamano 11/1942 3/8/1943 5/1944 sunk 5/4/1945
50 <RO50>     Tamano Zosen, Tamano 2/1943 27/11/1943 7/1944 surrendered 8/1945, scuttled 1/4/1946
55 <RO55>     Tamano Zosen, Tamano 8/1943 23/4/1944 9/1944 sunk 9/2/1945
56 <RO56> (ex-75 <RO75>)     Tamano Zosen, Tamano 12/1943 5/7/1944 11/1944 sunk 9/4/1945

  

Displacement standard, t

960

Displacement normal, t

1115 / 1447

Length, m

76.5 pp 79.0 wl 80.5 oa

Breadth, m

7.05

Draught, m

4.07

No of shafts

2

Machinery

2 Kampon diesels / 2 electric motors

Power, h. p.

4200 / 1200

Max speed, kts

19.7 / 8

Fuel, t

diesel oil 115

Endurance, nm(kts)

5000(16) / 45(5)

Armament

1 x 1 - 76/40 88-shiki, 1 x 2 - 25/60 96-shiki or 1 x 2 - 13.2/76, 4 - 533 TT (bow, 10)

Sensors

presumably 93-shiki sonar, 93-shiki hydrophone

Complement

54 - 61

Diving depth operational, m

75

Ship project history: Kaichu 6 (Medium Admiralty 6) type. Development of Kaichu 5 type. Larger and a little bit faster than predecessors, but with smaller endurance. Originally artillery was not provided, however 76mm gun was installed during outfitting. In total under 4th and 5th Supplementary programmes of 1939 and 1941, and also under the 1942 War programmes (basic and additional) building of 88 submarines was scheduled (RO49-56, 70-74, 76-99, 200-227 and nine unnamed hulls No715-723). Actually 18 submarines entered service, orders for remaining (RO51-54, 70-74, 76-99 and 200-227) were cancelled in 1943. Nos715-723 were never ordered.

Modernizations: None.

Naval service:RO35 was sunk 25/8/1943 SE off San Cristobal by US destroyer Patterson. RO38 after 19/11/1943 was lost between Truk and Gilbert Islands. RO37 was sunk 22/1/1944 E off San Cristobal by US destroyer Buchanan. RO39 was sunk 2/2/1944 W off Gilbert Islands by US destroyer Walker. RO40 was sunk 16/2/1944 at Kwajalein by US destroyer Phelps and minesweeper Sage. RO45 was sunk 30/4/1944 at Truk by US destroyers MacDonough, Stephen Potter and carrier aircraft. RO42 was sunk 10/6/1944 at Kwajalein by US escort destroyer Bangust. RO36 was sunk 13/6/1944 at Saipan by US destroyer Melvin. RO44 was sunk 16/6/1944 E off Eniwetok by US escort destroyer Burden R. Hastings. RO48 after 14/7/1944 was lost, possibly she was sunk 14/7/1944 at Saipan by US escort destroyer William . Miller. RO47 after 24/9/1944 was lost, presumably sunk 26/9/1944 in Carolina Islands area by US escort destroyer McCoy Reynolds. RO55 was sunk 7/2/1945 at Luzon by US escort destroyer Thomason. RO43 was sunk 26/2/1945 at Iwojima by US carrier aircraft. RO41 was sunk 23/3/1945 SE off Okinawa by US destroyer Haggard. RO49 after 25/3/1945 was lost, possibly sunk 5/4/1945 at Okinawa by US destroyer Hudson. RO56 after 18/3/1945 was lost, possibly she was sunk at Okinawa 9/4/1945 by US destroyers Mertz and Monssen. RO46 after 17/4/1945 was lost, possibly sunk at Okinawa 25/4/1945 by US fast personnel transport Horace A. Bass (under other version, she was sunk 18/4/1945 at Wake by US submarine Sea Owl). RO50 was scuttled by Americans 1/4/1946.

RO50

 

Ivan Gogin, 2008-14