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AMPHIBIOUS SHIPS AND CRAFT
"SS" type tank landing ships (KORYU MARU) (1942 - 1945)


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Ships


Name No Yard No Builder Laid down Launched Comp Fate
古流丸[Koryu Maru], 1944- 第1[1-go]     Harima Zosen, Harima 1941 1942 4.1942 sunk 13.1.1945
蟠龍丸[Banryu Maru], 1944- 第2[2-go]     Harima Zosen, Harima   1943 7.1943 sunk 13.9.1944
海龍丸[Kairyu Maru], 1944- 第3[3-go]         1943 1943 sunk 27.3.1944
第4[4-go]         1943 1944 sunk in autumn 1944
第5[5-go]         1943 1944 sunk 30.11.1944
第6[6-go]         1943 1944 sunk 4.12.1944
第7[7-go]         1943 1944 surrendered 8.1945, sold mercantile 1946
第8[8-go]         1943 1944 lost 1944/45
第9[9-go]         1943 1944 sunk 4.12.1944
第10[10-go]         1943 1944 sunk 1944/45
第11[11-go]         1943 1944 sunk in spring 1945
第12[12-go]         1943 1944 surrendered 8.1945, sold mercantile 1946
第13[13-go]         1943 1944 wrecked 8.1945
第14[14-go]         1944 1944 lost 1945
第15[15-go]         1944 1944 lost 1945
第16[16-go]         1944 1944 surrendered 8.1945, lost 4.1946
第17[17-go]         1944 1945 lost 5.6.1945
第18[18-go]         1944 1945 surrendered 8.1945, sold mercantile 1946
第19[19-go]         1944 1945 surrendered 8.1945, sold mercantile 1946
第20[20-go]         1944 1945 wrecked 20.5.1945
第21[21-go]         1944 1945 sunk 1.6.1945
第22[22-go]         1944 1945 sunk 8.8.1945
第23[23-go]     Sanko, Osaka   1944 --- completed mercantile 1946
第24[24-go]     Ohara, Osaka 3.1944 1945 --- sunk incomplete 1945
第25[25-go]     Kowloon, Hong Kong 1944 --- --- BU incomplete
第26[26-go]     Kowloon, Hong Kong 1944 --- --- BU incomplete
第27[27-go]     Kowloon, Hong Kong 1944 --- --- BU incomplete


100 - 1000 t displacement/ BRT tonnage vessels


Name No Yard No Builder Laid down Launched Comp Fate 古流丸[Koryu Maru], 1944- 第1[1-go]     Harima Zosen, Harima 1941 1942 4.1942 sunk 13.1.1945 蟠龍丸[Banryu Maru], 1944- 第2[2-go]     Harima Zosen, Harima   1943 7.1943 sunk 13.9.1944 海龍丸[Kairyu Maru], 1944- 第3[3-go]         1943 1943 sunk 27.3.1944 第4[4-go]         1943 1944 sunk in autumn 1944 第5[5-go]         1943 1944 sunk 30.11.1944 第6[6-go]         1943 1944 sunk 4.12.1944 第7[7-go]         1943 1944 surrendered 8.1945, sold mercantile 1946 第8[8-go]         1943 1944 lost 1944/45 第9[9-go]         1943 1944 sunk 4.12.1944 第10[10-go]         1943 1944 sunk 1944/45 第11[11-go]         1943 1944 sunk in spring 1945 第12[12-go]         1943 1944 surrendered 8.1945, sold mercantile 1946 第13[13-go]         1943 1944 wrecked 8.1945 第14[14-go]         1944 1944 lost 1945 第15[15-go]         1944 1944 lost 1945 第16[16-go]         1944 1944 surrendered 8.1945, lost 4.1946 第17[17-go]         1944 1945 lost 5.6.1945 第18[18-go]         1944 1945 surrendered 8.1945, sold mercantile 1946 第19[19-go]         1944 1945 surrendered 8.1945, sold mercantile 1946 第20[20-go]         1944 1945 wrecked 20.5.1945 第21[21-go]         1944 1945 sunk 1.6.1945 第22[22-go]         1944 1945 sunk 8.8.1945 第23[23-go]     Sanko, Osaka   1944 --- completed mercantile 1946 第24[24-go]     Ohara, Osaka 3.1944 1945 --- sunk incomplete 1945 第25[25-go]     Kowloon, Hong Kong 1944 --- --- BU incomplete 第26[26-go]     Kowloon, Hong Kong 1944 --- --- BU incomplete 第27[27-go]     Kowloon, Hong Kong 1944 --- --- BU incomplete

Technical data


Displacement normal, t948
Displacement full, t 
Length, m

59.6 pp 63.0 oa
Breadth, m

9.60
Draught, m

2.79
No of shafts

2
Machinery

2 diesels
Power, h. p.

1100
Max speed, kts

13.5
Fuel, tdiesel oil
Endurance, nm(kts)2000(12)
Armament

1-go - 3-go: 1 x 1 - 75/44 4-shiki, 4 x 1 - 20/65 98-shiki, 4 x 1 - 7.7/80, 1 x 1 - 150/12 96-shiki mortar

4-go - 22-go: 1 x 1 - 76/40 11-shiki, 4 x 1 - 25/60 96-shiki, 1 x 1 - 150/12 96-shiki mortar
Military load4 15t tanks, 1 truck, 170 troops
Complement 


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Project history


The design was developed on IJA order, but control over building and subsequent operation of majority of them realised by IJN. Represented usual cargo vessels adapted for transportation of military cargo and troops. Engine and superstructure took places at aft end, amidships part of the hull has been occupied by two large holds. Fore end had icebreaking form that allowed the ship to come nearer closely to a shore. Beaching was realised through a folding gangway port.

First SS1-3 originally were under Army control and were named. In 1944 they were transferred to IJN and numbered. Remaining ships were transferred under naval control even before completion. At least five ships of the class remained incomplete. Incomplete SS24 was sunk by US aircraft in 1945 at Osaka. Incomplete 23-go was badly damaged at Osaka in August, 1945 by US aircraft and completed later mercantile.

Modernizations


1944, 1-go, 2-go: - 1 x 1 - 75/44, 4 x 1 - 20/65; + 1 x 1 - 76/40 11-shiki, 4 x 1 - 25/60 96-shiki

Naval service


17 ships of this class were lost in days of war: SS3 (sunk 27.3.1944 by submarine near New Guinea), SS4 (lost in autumn 1944 in Philippines area), SS2 (sunk 13.9.1944 by US aircraft near Cebu), SS5 (sunk by US aircraft 30.11.1944 near Masbate), SS6 and SS9 (sunk 4.12.1944 by US aircraft off Mindoro), SS1 (sunk 13.1.1945 by US aircraft at Luzon), SS11 (lost in spring 1945 near Shiranoe or Moji), SS20 (ran aground near Shodoshima 20.5.1945, raised 17.9.1945 but lost in storm while under repair, raised again and converted to mercantile vessel in 1946), SS21 (sunk 1.6.1945 by US aircraft near Osaka, raised and used as mercantile), SS17 (sunk by US aircraft 5.6.1945 off Talien), SS13 (August, 1945), SS22 (sunk 8.8.1945 by US carrier aircraft near Aomori). Besides, dates of loss of SS8, SS10, SS14 and SS15 are not known. SS16 was presumably lost in April, 1946 at Yohimi, raised and broken up in 1947.