NAVYPEDIA

Photo

RO31

Ships

Name	No	Yard No	Builder	Laid down	Launched	Comp	Fate
第68号艦 [68-go], 11.1924- 呂29 [RO29]			Kawasaki, Kobe	6.1921	5.12.1922	9.1923	sold 4.1936
第69号艦 [69-go], 11.1924- 呂30 [RO30]			Kawasaki, Kobe	8.1921	18.1.1923	4.1924	stricken 4.1942
第70号艦 [70-go]			Kawasaki, Kobe	8.1922	2/1923	---	sunk in trials 21.8.1923
呂31 [RO31]			Kawasaki, Kobe	12.1924	25.9.1926	5.1927	stricken 5.1945
第71号艦 [71-go], 11.1924- 呂32 [RO32]			Kawasaki, Kobe	9.1921	19.3.1923	5.1924	stricken 4.1942

Technical data

Displacement standard, t
Displacement normal, t	665 / 1030
Length, m	74.2
Breadth, m	6.10
Draught, m	3.70
No of shafts	2
Machinery	2 FIAT diesels / 2 electric motors
Power, h. p.	1200 / 1200
Max speed, kts	13 / 8
Fuel, t	diesel oil 113 - 116
Endurance, nm(kts)	8000(10) / 85(4)
Armament	1 x 1 - 120/45 11-shiki, 1 x 1 - 7.7/87, 4 - 533 TT (bow, 8)
Complement	43
Diving depth operational, m	75

Standard scale images

Graphics

Project history

Kai-Toku-Chu (Medium special Admiralty) type. Built under the 1918 programme, developed on the basis of the Schneider-Laubeuf design. Nos72-87 were cancelled under terms of Washington Treaty.

Modernizations

none

Naval service

70-go during commissioning trials 21.8.1923 foundered in Kobe harbour as result of technical accident, salvaged in November, 1924. She was officially repaired and completed in 1927 but as fact new submarine was built.

RO30-32 were laid up 1.4.1942, till the end of war they were used as training hulks. RO31 was scuttled by Americans 5.4.1946.