Japanese Type L submarine

{{Infobox ship class overview

|Name=Type L submarines

|Builders=Mitsubishi Heavy Industries-Kōbe Shipyard

|Operators={{navy|Empire of Japan}}

|Class before=

|Class after=

|Subclasses=*Type L1 (Ro-51-class)

Type L2 (Ro-53-class)
Type L3 (Ro-57-class)
Type L4 (Ro-60 -class)

|Cost=

|Built range=1918-1927

|In service range=

|In commission range=1920-1945

|Total ships building=

|Total ships planned=

|Total ships completed=

|Total ships cancelled=

|Total ships active=

|Total ships laid up=

|Total ships lost=

|Total ships retired=

|Total ships preserved=

}}

The {{nihongo|Type L submarine|L型潜水艦|L-gata Sensuikan}} submarines were medium-sized submarines of the Imperial Japanese Navy (IJN), serving during the 1920s and World War II. The Type L submarines were built with Vickers naval technical guidance. All boats were built in the Mitsubishi Heavy Industries-Kobe Shipyard by the contract with Vickers.

Class variants

The Type L submarines were divided into four classes:

{{nihongo|Type L1|L1型（呂五十一型）|Ro-go-jū-ichi-gata, Ro-51-class}}
{{nihongo|Type L2|L2型（呂五十三型）|Ro-go-jū-san-gata, Ro-53-class}}
{{nihongo|Type L3|L3型（呂五十七型）|Ro-go-jū-shichi-gata, Ro-57-class}}
{{nihongo|Type L4|L4型（呂六十型）|Ro-roku-jū-gata, Ro-60-class}}

=''Type L1 (Ro-51-class)''=

Image:Japanese submarine Ro-51 in the 1920s.jpg

In 1916, the Mitsubishi Shipbuilding Corporation got the Vickers L class submarine informations. Mitsubishi which lost competition to the Kawasaki's Type F submarines (Fiat-Laurenti design, Ro-1 class and Ro-3 class), bought the license for the L class submarine from Vickers. The IJN hoped an improvement of submarine technologies will be achieved and ordered this submarine from Mitsubishi. Mitsubishi bought six submarine kits, and built two boats by semi-knock down. The submarine crews were satisfied with the Vickers diesels because they proved to be reliable. The IJN studied the diesel engines and made many variants of similar design, for example: Kampon Mk.24 diesel for the Ro-100 class.

Boats in class

class="wikitable"

! width="7%" | Boat

! width="6%" | Laid down

! width="6%" | Launched

! width="6%" | Completed

! width="15%" | Note, fate

{{ship|Japanese submarine|Ro-51

2}}{{nihongo|呂号第51潜水艦|Ro-Gō Dai-51 Sensuikan}}. The same shall apply hereinafter.
ex-Submarine No. 25

| 10–08–1918

| 10–10–1919

| 30–06–1920

| Renamed Ro-51 01–11–1924. Decommissioned 01–04–1940.

{{ship|Japanese submarine|Ro-52

2}}
ex-Submarine No. 26

| 10–08–1918

| 09–03–1920

| 30–11–1920

| Renamed Ro-52 01–11–1924. Decommissioned 01–04–1932.

=''Type L2 (Ro-53-class)''=

Image:Japanese submarine Ro-54 1920s.jpg

The Type L2 had minor changes from the Type L1. The changes were:

The ship's side torpedo tubes were removed.
Changed the batteries. (The L1 was equipped 3 groups, 336 small-sized batteries. The L2 was equipped 2 groups, 224 medium-sized batteries.)
Boats in class

class="wikitable"

! width="7%" | Boat

! width="6%" | Laid down

! width="6%" | Launched

! width="6%" | Completed

! width="15%" | Note, fate

{{ship|Japanese submarine|Ro-53

2}}
ex-Submarine No. 27

| 01–04–1919

| 06–07–1919

| 10–03–1921

| Renamed Ro-53 01–11–1924. Decommissioned 01–04–1940.

{{ship|Japanese submarine|Ro-54

2}}
ex-Submarine No. 28

| 01–11–1919

| 13–11–1920

| 10–09–1921

| Renamed Ro-54 01–11–1924. Decommissioned 01–04–1940.

{{ship|Japanese submarine|Ro-55|1921|2}}
ex-Submarine No. 29

| 30–03–1920

| 10–02–1921

| 15–11–1921

| Renamed Ro-55 01–11–1924. Decommissioned 01–04–1940.

{{ship|Japanese submarine|Ro-56|1921|2}}
ex-Submarine No. 30

| 10–07–1920

| 11–05–1921

| 16–01–1922

| Renamed Ro-56 01–11–1924. Decommissioned 01–04–1940.

=''Type L3 (Ro-57-class)''=

Image:Japanese submarine RO-58 in 1925.jpg

The Type L3 is a license production model of the British L class submarine Group 2.

Boats in class

class="wikitable"

! width="7%" | Boat

! width="5%" | Laid down

! width="5%" | Launched

! width="5%" | Completed

! width="8%" | Results

! width="20%" | Note, fate

{{ship|Japanese submarine|Ro-57

2}}
ex-Submarine No. 46

| 20–11–1920

| 03–12–1921

| 30–07–1922

| Renamed Ro-57 01–11–1924. Decommissioned 20–11–1945. Later scuttled off Kure.

{{ship|Japanese submarine|Ro-58

2}}
ex-Submarine No. 47

| 15–02–1921

| 02–03–1922

| 25–11–1922

| Renamed Ro-58 01–11–1924. Decommissioned 15–09–1945. Later scuttled off Shimizu.

{{ship|Japanese submarine|Ro-59

2}}
ex-Submarine No. 57

| 18–05–1921

| 28–06–1922

| 20–03–1923

| Renamed Ro-59 01–11–1924. Decommissioned 20–11–1945. Scuttled at Iyo-nada, May 1946.

=''Type L4 (Ro-60-class)''=

Image:RO-64.jpg

The Type L4 is a license production model of the British L class submarine Group 3. Their performance was good. The IJN was satisfied with them and stopped the development of Kaichū type submarines for a long time. Later the IJN was not able to regain the technical delay in development of the medium-sized submarines until the end of the Pacific War.

Boats in class

class="wikitable"

! width="7%" | Boat

! width="5%" | Laid down

! width="5%" | Launched

! width="5%" | Completed

! width="12%" | Results

! width="15%" | Note, fate

{{ship|Japanese submarine|Ro-60

2}}
ex-Submarine No. 59

| 05–12–1921

| 20–12–1922

| 17–09–1923

| Renamed Ro-60 01–11–1924. Lost in an accident at Kwajalein 29–12–1941.

{{ship|Japanese submarine|Ro-61

2}}
ex-Submarine No. 72

| 05–06–1922

| 19–05–1923

| 09–02–1924

| Damaged {{ship|USS|Casco|AVP-12|6}} 30–08–1942

| Renamed Ro-61 01–11–1924. Sunk by {{ship|USS|Reid|DD-369|6}} 31–08–1942.

{{ship|Japanese submarine|Ro-62

2}}
ex-Submarine No. 73

| 08–09–1922

| 29–09–1923

| 24–07–1924

| Renamed Ro-62 01–11–1924. Decommissioned 20–11–1945. Scuttled at Iyo-nada, May 1946.

{{ship|Japanese submarine|Ro-63

2}}
ex-Submarine No. 84

| 02–04–1923

| 24–01–1924

| 20–12–1924

| Renamed Ro-63 01–11–1924. Decommissioned 20–11–1945. Scuttled at Iyo-nada, May 1946.

{{ship|Japanese submarine|Ro-64

2}}
ex-Submarine No. 79

| 15–10–1923

| 19–08–1924

| 30–04–1925

| Renamed Ro-64 01–11–1924. Sunk by naval mine at Hiroshima Bay 12–04–1945.

{{ship|Japanese submarine|Ro-65

2}}

| 15–11–1924

| 19–09–1925

| 30–06–1926

| Lost in an accident at Kiska 04–11–1942.

{{ship|Japanese submarine|Ro-66

2}}

| 01–12–1925

| 25–10–1926

| 28–07–1927

| Collided with Ro-62 and sunk southwest of Wake Island 17–12–1941.

{{ship|Japanese submarine|Ro-67

2}}

| 05–03–1925

| 18–03–1926

| 15–12–1926

| Decommissioned 20–07–1945. Scuttled off Sasebo, July 1948.

{{ship|Japanese submarine|Ro-68

2}}

| 06–02–1924

| 23–02–1925

| 29–10–1925

| Decommissioned 30–11–1945. Scuttled off Maizuru, 30–04–1946.

Characteristics

class="wikitable" width="90%"

| width="15%" colspan="2"| Type

| width="16%" | L1 (Ro-51)

| width="16%" | L2 (Ro-53)

| width="16%" | L3 (Ro-57)

| width="16%" | L4 (Ro-60)

rowspan="2"|Displacement

| Surfaced

| {{convert|893|LT|t|0}}

| {{convert|889|LT|t|0}}

| {{convert|988|LT|t|0}}

Submerged

| {{convert|1075.2|LT|t|0}}

| {{convert|1075.3|LT|t|0}}

| {{convert|1102.7|LT|t|0}}

| {{convert|1301|LT|t|0}}

colspan="2"| Length (overall)

| {{convert|70.59|m|ftin|abbr=on}}

| {{convert|72.89|m|ftin|abbr=on}}

| {{convert|78.39|m|ftin|abbr=on}}

colspan="2"| Beam

| {{convert|7.16|m|ftin|abbr=on}}

| {{convert|7.41|m|ftin|abbr=on}}

colspan="2"| Draft

| {{convert|3.90|m|ftin|abbr=on}}

| {{convert|3.94|m|ftin|abbr=on}}

| {{convert|3.96|m|ftin|abbr=on}}

colspan="2"| Power plant and shaft

| 2 × Vickers diesels, 2 shafts

rowspan="2"|Power

| Surfaced

| 2,400 bhp

Submerged

| 1,600 shp

rowspan="2"|Speed

| Surfaced

| {{convert|17|kn|km/h|lk=in}}

| {{convert|17.3|kn|km/h|lk=in}}

| {{convert|17.1|kn|km/h|lk=in}}

| {{convert|15.7|kn|km/h|lk=in}}

Submerged

| {{convert|10.2|kn|km/h|lk=in}}

| {{convert|10.4|kn|km/h|lk=in}}

| {{convert|9.1|kn|km/h|lk=in}}

| {{convert|8.6|kn|km/h|lk=in}}

rowspan="2"|Range

| Surfaced

| {{convert|5500|nmi|km|abbr=on|lk=in}} at {{convert|10|kn|km/h}}

Submerged

| {{convert|80|nmi|km|abbr=on|lk=in}} at {{convert|4|kn|km/h}}

colspan="2"| Test depth

| {{convert|60|m|ft|abbr=on}}

colspan="2"| Fuel

| 75 tons

colspan="2"| Complement

| 45

| 46

| 48

colspan="2"| Armament (initial)

| • 6 × {{convert|450|mm|in|0|abbr=on}} TTs
(4 × bow, 2 × broadside)
• 10 × Type 44 torpedoes
• 1 × 8 cm/40 3rd Year Type naval gun#Variants L/23.5 AA gun

| • 4 × 450 mm TTs (4 × bow)
• 8 × Type 44 torpedoes
• 1 × 76.2 mm L/23.5 AA gun

| • 4 × {{convert|533|mm|in|0|abbr=on}} TTs (4 × bow)
• 8 × 6th Year Type torpedoes
• 1 × 76.2 mm L/23.5 AA gun
• 1 × 6.5 mm machine gun

| • 6 × 533 mm TTs (6 × bow)
• 12 × 6th Year Type torpedoes
• 1 × 8 cm/40 3rd Year Type naval gun L/40 naval gun
• 1 × 6.5 mm machine gun

Bibliography

{{cite web |url=http://rekigun.net/ |title=Rekishi Gunzō}}, History of Pacific War Extra, "Perfect guide, The submarines of the Imperial Japanese Forces", Gakken (Japan), March 2005, {{ISBN|4-05-603890-2}}
The Maru Special, Japanese Naval Vessels No.43 Japanese Submarines III, Ushio Shobō (Japan), September 1980, Book code 68343–44
The Maru Special, Japanese Naval Vessels No.132 Japanese Submarines I "Revised edition", Ushio Shobō (Japan), February 1988, Book code 68344–36
The Maru Special, Japanese Naval Vessels No.133 Japanese Submarines II "Revised edition", Ushio Shobō (Japan), March 1988, Book code 68344-37

References

L type submarine, Japan

Category:Submarines of the Imperial Japanese Navy