NAVYPEDIA

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44-go  

Ships

Name	No	Yard No	Builder	Laid down	Launched	Comp	Fate
第44号艦 [44-go], 11.1924- 伊51 [I51]			Kure K K	1921	29.11.1921	6/1924	stricken 1941

Technical data

Displacement standard, t
Displacement normal, t	1500 / 2430
Length, m	87.0 pp 91.4 oa
Breadth, m	8.81
Draught, m	4.60
No of shafts	4
Machinery	4 Sulzer diesels / 4 electric motors
Power, h. p.	5200 / 2000
Max speed, kts	20 / 10
Fuel, t	diesel oil 160
Endurance, nm(kts)	20000(10) / 100(4)
Armament	1 x 1 - 120/45 11-shiki, 1 x 1 - 76/40 3-go, 8 - 533 TT (6 bow, 2 stern, 24)
Electronic equipment	K-chubu hydrophone
Complement	60
Diving depth operational, m	60

Standard scale images

Graphics

Project history

Kaidai 1 (Large Admiralty 1) type. Under the "8-8" programme building of several large submarines for joint operations with battle forces at a great distance from bases was provided. According to Naval staff requirements (10000nm endurance, raised seaworthiness, max surface speed not less than 20kts) in 1919 Naval technical department has started designing of 1500t submarine cruiser. Difficulties which have arisen at designing of so large submarine, have compelled Japanese designers to use British and German experience. For the fullest account of merits and demerits of each of shipbuilding schools it has been decided to build two experimental submarines. As a prototype for the first of them (Kaidai 1) RN cruiser submarine of "K" class (with replacement of a steam turbine by diesels), and for second (Kaidai 2) German submarine cruiser U139 should serve. Double-hulled.

Comparative trials of I51 and I52 have revealed preferable characteristics of the latter, in particular, she was faster, possessed better seaworthiness, and her engine has appeared more reliably. However I51 had higher endurance and carried more torpedoes.

Modernizations

1932: 2 shafts were removed, engine power was 2600 / 1000hp, maximal speed 14.5 / 6.2kts; - 1 x 1 - 76/40; + 1 seaplane (E6Y)

1933: + catapult

Naval service

I51 was used for training in 1930-1939.