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KRS Class, Japanese Submarines


Photograph of KRS-class submarine

Wikipedia Commons

Specifications:

Tonnage

1142 tons standard displacement
1383 tons surfaced
1768 tons submerged

Dimensions

280' by 25' by 14'6"
85.34m by 7.62m by 4.42m

Maximum speed      

14.5 knots surfaced
7 knots submerged

Complement

75

Dive to 200 feet (60 meters)

Armament

1 5.5"/50 gun
1 light machine gun
4 21" torpedo tubes (12 torpedoes)
42 mines

Machinery
2-shaft diesel/electric (2400 shp surfaced, 1100 shp submerged)
Bunkerage 225 tons diesel oil

Range

6130 nautical miles (11,000 km) at 16 knots surfaced
10,500 nautical miles (19,000 km) at 8 knots surfaced
40 nautical miles (75 km) at 4.5 knots submerged


The KRS (Kirai fusetsu sensuikan or kirai sen) boats were completed in 1927-28 in the Kawasaki Kobe yards. They were closely modeled on the German UB-125, which had been surrendered to Japan at the close of the First World War, and they were crowded, oversized, unmaneuverable, and lacked underwater stability. However, they were the only specialized minelaying submarines the Japanese built. Mines were deployed from two aft minelaying tubes. By the start of the war they had been converted to tanker submarines for seaplanes, although they retained their minelaying capability.


Units in the Pacific:

I-121      

Off Singapore

Relegated to training 1942-8-15

I-122

Off Singapore

Torpedoed 1945-6-10 off Japan by Skate

I-123

Balabac Strait

Sunk 1942-8-29 off Savo by Gamble

I-124

Off Manila Bay      

Sunk 1942-1-20 off Darwin by Edsall and Deloraine

References

Boyd and Yoshida (1995)

Carpenter and Polmar (1986)

Jentschura, Jung, and Mickel (1977)

Kehn (2008)

Worth (2001)


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