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fighting ships of the world

IMPERIAL JAPANESE NAVY (JAPAN)

SUBMARINES

"Junsen 1" patrol submarines (1926-1929)

I1 1942

Name No Yard No Builder Laid down Launched Comp Fate
1 <I1> (ex-第74号艦 <74-go>)     Kawasaki, Kobe 3/1923 15/10/1924 3/1926 sunk 29/1/1943
2 <I2> (ex-第75号艦 <75-go>)     Kawasaki, Kobe 8/1923 23/2/1925 7/1926 sunk 7/4/1944
3 <I3> (ex-第76号艦 <76-go>)     Kawasaki, Kobe 11/1923 8/6/1925 11/1926 sunk 9/12/1942
4 <I4>     Kawasaki, Kobe 4/1926 22/5/1928 12/1929 sunk 25/12/1942

  

Displacement standard, t

1970

Displacement normal, t

2135 / 2791

Length, m

94.0 pp 93.9 wl 97.5 oa

Breadth, m

9.22

Draught, m

5.00

No of shafts

2

Machinery

2 MAN diesels / 2 electric motors

Power, h. p.

6000 / 2600

Max speed, kts

18 / 8

Fuel, t

diesel oil 175

Endurance, nm 24400(10) / 60(3)
Armament

2 x 1 - 140/40 11-shiki, 2 x 1 - 7.7/87, 6 - 533 TT (4 bow, 2 stern, 20)

Complement

92

Diving depth operational, m

80

Ship project history: Junsen 1 (Cruiser submarine 1) type. First submarine cruisers of IJN were built under the 1923-1928 programme. According to Naval staff plans, long-distance reconnaissance far away from own bases should become a basic purpose of cruiser submarines. It has defined a huge endurance in the technical project (24000nm). Drawings of German submarine cruiser U139 became a design basis. As she served as a prototype for fleet submarine of Kaidai 2 type, designs of fleet and cruiser submarines have appeared are close enough under the characteristics, but thus Junsen 1 was closer to German prototype.  Double-hulled. CT and free board were protected by light armour. Endurance was about 60 days.

Modernizations: 1942 - 1943, I1, 2: were converted to transports: - 1 x 1 - 140/40, torpedoes stowage was decreased, they can carry 1 14m Daihatsu-type landing craft and cargo.

Naval service: I3 was sunk 10/12/1942 in Solomons area by US MTB 59. I4 was lost after 21/12/1942 (presumably sunk 20/12/1942 off New England by US submarine Seadragon). I1 was sunk 29/1/1943 in Solomons area by gunfire and ramming of New Zealand corvettes Kiwi and Moa. I2 was sunk 7/4/1944 E off New Hanover by US destroyer Saufley.

I1 1926

 

Ivan Gogin, 2008-14