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Ro-100-class submarine

{{Use dmy dates|date=January 2018}}

{{Infobox ship begin}}

{{Infobox ship image

|Ship image= Japanese submarine Ro-101 in 1943.jpg

|Ship caption=Ro-101 in 1943

}}

{{Infobox ship class overview

|Name=Ro-100-class submarine

|Builders=*Kure Naval Arsenal

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

|Class before=

|Class after=

|Cost=

|Built range=1941–44

|In service range=

|In commission range=1942–45

|Total ships planned=18

|Total ships completed=18

|Total ships lost=18

}}

{{Infobox ship characteristics

|Hide header=

|Header caption=

|Ship type=Submarine

|Ship displacement=*{{Convert|601|LT|t|0|disp=flip}} surfaced

  • {{Convert|782|LT|t|0|disp=flip}} submerged

|Ship length={{convert|60.90|m|ftin|abbr=on}} overall

|Ship beam= {{convert|6.00|m|ftin|abbr=on}}

|Ship draft={{convert|3.51|m|ftin|abbr=on}}

|Ship power=*{{convert|1000|bhp|lk=in|abbr=on}} (diesel)

|Ship propulsion=*Diesel-electric

|Ship speed=*{{convert|14.2|kn|lk=in}} surfaced

  • {{convert|8|kn}} submerged

|Ship range=*{{convert|3500|nmi|abbr=on|lk=in}} at {{convert|12|kn}} surfaced

  • {{convert|60|nmi|abbr=on}} at {{convert|3|kn}} submerged

|Ship crew=38

|Ship test depth={{convert|75|m|ft|abbr=on}}

|Ship armament=*4 × bow {{convert|533|mm|in|0|abbr=on}} torpedo tubes

|Ship notes=

}}

The {{nihongo|Ro-100-class submarine|呂百型潜水艦|Ro-hyaku-gata Sensuikan}} was a group of medium-sized coastal submarines built for the Imperial Japanese Navy (IJN) during World War II. The IJN official designation for this class was {{nihongo|Ko type submarine|小型潜水艦|Ko-gata Sensuikan, "Small type Submarine"}} or {{nihongo|Senshō type submarine|潜小型潜水艦|Sen-Shō-gata sensuikan, "Submarine-Small Type"}}. They are also known as Type KS submarine. The type name was shortened to {{nihongo|Sensuikan Ko-gata|潜水艦小型|Submarine-Small Type}}.The {{nihongo2|小}} read as "Shō" and the {{nihongo2|潜小}} read as "Sen-Shō", but the {{nihongo2|小型}} read as "Ko-gata" and the {{nihongo2|潜小型}} read as "Sen-Shō-gata" in Japanese.

Design and description

In 1940, the IJN designed a point-defence coastal submarine because they wanted to save their larger submarines for fleet battles. The Ro-100 class was derived from the preceding Kaichū type. They displaced {{Convert|601|LT|t|0|disp=flip}} surfaced and {{Convert|782|LT|t|0|disp=flip}} submerged. The submarines were {{convert|60.9|m|ftin|sp=us}} long, had a beam of {{convert|6|m|ftin|sp=us}} and a draft of {{convert|3.51|m|ftin|sp=us}}. They had a double hull and a diving depth of {{convert|75|m|ft|sp=us}}.Carpenter & Dorr, p. 123

For surface running, the boats were powered by two {{convert|500|bhp|lk=in|0|adj=on}} diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a {{convert|380|hp|0|adj=on}} electric motor. They could reach {{convert|14.2|kn|lk=in}} on the surface and {{convert|8|kn}} underwater. On the surface, the Ro-100s had a range of {{convert|3500|nmi|lk=in}} at {{convert|12|kn}}; submerged, they had a range of {{convert|60|nmi|abbr=on}} at {{convert|3|kn}}.Chesneau, p. 204

The boats were armed with four internal bow {{convert|53.3|cm|in|1|abbr=on|sp=us}} torpedo tubes and carried a total of eight torpedoes. They were also armed with two single mounts for Type 96 25 mm AT/AA Gun anti-aircraft guns or a single 8 cm/40 3rd Year Type naval gun L/40 AA gun.Bagnasco, p. 193

Boats

18 boats were built in 1941-1944 under the Maru Rin Programme (Boat #210-218) and the Maru Kyū Programme (Boat #400-408).

class="wikitable"
style="width:4%;"| Boat #

| style="width:4%;"| Name

| style="width:8%;"| Builder

| style="width:6%;" bgcolor=| Laid down

| style="width:6%;" bgcolor=| Launched

| style="width:6%;" bgcolor=| Completed

| style="width:14%;" bgcolor=| Results

| style="width:15%;" bgcolor=| Fate

210

| {{ship|Japanese submarine|Ro-100

2}} {{nihongo|呂号第100潜水艦|Ro-Gō Dai-100 Sensuikan}}. The same shall apply hereinafter.

| Kure Naval Arsenal

| 1941-06-30

| 1941-06-12

| 1942-08-23

|

| Sunk by naval mine off Bougainville Island 1943-11-25.

211

| {{ship|Japanese submarine|Ro-101

2}}

| Kawasaki-Kōbe Shipyard

| 1941-09-30

| 1942-04-17

| 1942-10-31

|

| Sunk by {{ship|USS|Saufley|DD-465|6}} and PBY southeast of San Cristobal 1943-09-15.

212

| {{ship|Japanese submarine|Ro-102

2}}

| Kawasaki-Kōbe Shipyard

| 1941-09-30

| 1942-04-17

| 1942-11-17

|

| Disappeared south of Rabi after 1943-05-09.Although her loss is credited to PT-150 and PT-152 off Lae, New Guinea on 13/14 May 1943, the submarine was later confirmed as I-6, which survived the encounter.

213

| {{ship|Japanese submarine|Ro-103

2}}

| Kure Naval Arsenal

| 1941-06-30

| 1941-12-06

| 1942-10-21

| Sank {{ship|USS|Aludra|AK-72|6}} 1943-06-23
Sank {{ship|USS|Deimos|AK-78|6}} 1943-06-23

| Disappeared in the Solomon Islands after 1943-07-28, possibly sunk by a mine or a PT boat.

214

| {{ship|Japanese submarine|Ro-104

2}}

| Kawasaki-Kōbe Shipyard

| 1941-11-19

| 1942-07-11

| 1943-02-25

|

| Sunk by {{ship|USS|England|DE-635|6}} north of the Admiralty Islands 1944-05-23.

215

| {{ship|Japanese submarine|Ro-105

2}}

| Kawasaki-Kōbe Shipyard

| 1941-11-19

| 1942-07-11

| 1943-03-05

|

| Sunk by {{ship|USS|England|DE-635|6}} north of the Admiralty Islands 1944-05-31.

216

| {{ship|Japanese submarine|Ro-106

2}}

| Kure Naval Arsenal

| 1941-12-17

| 1942-05-30

| 1942-12-26

| Sank {{USS|LST-342

6}} 1943-07-11

| Sunk by {{ship|USS|England|DE-635|6}} north of the Admiralty Islands 1944-05-22.

217

| {{ship|Japanese submarine|Ro-107

2}}

| Kure Naval Arsenal

| 1941-12-17

| 1942-05-30

| 1942-12-26

|

| Sunk by {{ship|USS|Taylor|DD-468|6}} east of Kolombangara 1943-07-21.

218

| {{ship|Japanese submarine|Ro-108

2}}

| Kawasaki-Kōbe Shipyard

| 1942-04-20

| 1942-10-26

| 1943-04-20

| Sank {{ship|USS|Henley|DD-391|6}} 1943-10-03

| Sunk by {{ship|USS|England|DE-635|6}} north of the Admiralty Islands 1944-05-26.

400

| {{ship|Japanese submarine|Ro-109

2}}

| Kawasaki-Kōbe Shipyard

| 1942-04-20

| 1942-10-26

| 1943-04-29

|

| Sunk by {{ship|USS|Horace A. Bass|APD-124|6}} south of Okinawa Island 1945-04-25.

401

| {{ship|Japanese submarine|Ro-110

2}}

| Kawasaki-Kōbe Shipyard

| 1942-08-20

| 1943-01-26

| 1943-07-06

|

| Sunk by {{ship|HMAS|Launceston|J179|6}}, {{ship|HMAS|Ipswich|J186|6}} and {{ship|HMIS|Jumna

6}} in the Bay of Bengal 1944-02-12.
402

| {{ship|Japanese submarine|Ro-111

2}}

| Kawasaki-Kōbe Shipyard

| 1942-08-20

| 1943-01-26

| 1943-07-10

| Sank RMS Peshawar 1943-12-23

| Sunk by {{ship|USS|Taylor|DD-468|6}} north of the Admiralty Islands 1944-06-10.

403

| {{ship|Japanese submarine|Ro-112

2}}

| Kawasaki-Senshū Shipyard

| 1942-06-20

| 1943-03-25

| 1943-09-14

|

| Sunk by {{ship|USS|Batfish|SS-310|6}} in the Luzon Strait 1945-02-11.

404

| {{ship|Japanese submarine|Ro-113

2}}

| Kawasaki-Senshū Shipyard

| 1942-07-11

| 1943-04-24

| 1943-10-12

|

| Sunk by {{ship|USS|Batfish|SS-310|6}} in the Luzon Strait 1945-02-12.

405

| {{ship|Japanese submarine|Ro-114

2}}

| Kawasaki-Senshū Shipyard

| 1942-10-12

| 1943-06-19

| 1943-11-20

|

| Sunk by {{ship|USS|Melvin|DD-680|6}} and {{ship|USS|Wadleigh|DD-689|6}} east of Saipan 1944-06-17.

406

| {{ship|Japanese submarine|Ro-115

2}}

| Kawasaki-Senshū Shipyard

| 1942-10-12

| 1943-06-19

| 1943-11-30

|

| Sunk by {{USS|Jenkins|DD-447|6}}, {{ship|USS|O'Bannon|DD-450|6}} and {{ship|USS|Bell|DD-587|6}} west of Mindoro 1945-02-01. Holmes contradicts the identification,Holmes, W. J., 1966, Undersea Victory: The Influence of Submarine Operations on the War in the Pacific, pg. 428-429 indicating that Ro-115 acknowledged orders to proceed to Manila two days after the supposed date of its sinking, and was more likely to have been sunk by {{ship|USS|Batfish|SS-310|6}} on 1945-02-10.Which sub was it? http://www.ussbatfish.com/whichsub.html {{Webarchive|url=https://web.archive.org/web/20120805212522/http://www.ussbatfish.com/whichsub.html |date=5 August 2012 }}

407

| {{ship|Japanese submarine|Ro-116

2}}

| Kawasaki-Senshū Shipyard

| 1943-01-16

| 1943-09-13

| 1944-01-21

|

| Sunk by {{ship|USS|England|DE-635|6}} north of the Admiralty Islands 1944-05-24.

408

| {{ship|Japanese submarine|Ro-117

2}}

| Kawasaki-Senshū Shipyard

| 1943-01-16

| 1943-09-13

| 1944-01-31

|

| Sunk by USN patrol bomber southeast of Saipan 1944-05-24.

Footnotes

{{Reflist|30em}}

Bibliography

  • {{cite book|last=Bagnasco |first=Erminio |title=Submarines of World War Two |year=1977 |publisher=Naval Institute Press |location=Annapolis, Maryland |isbn=0-87021-962-6}}
  • {{cite book|last1=Carpenter|first1=Dorr B.|last2=Polmar|first2=Norman|title=Submarines of the Imperial Japanese Navy 1904–1945|year=1986|publisher=Conway Maritime Press|location=London|isbn=0-85177-396-6|name-list-style=amp}}
  • {{cite book|title=Conway's All the World's Fighting Ships 1922–1946|editor1-last=Chesneau|editor1-first=Roger|publisher=Conway Maritime Press|location=Greenwich, UK|year=1980|isbn=0-85177-146-7}}
  • {{cite web |url=http://rekigun.net/ |title=Rekishi Gunzō}}, History of Pacific War Vol.17 I-Gō Submarines, Gakken (Japan), January 1998, {{ISBN|4-05-601767-0}}
  • 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 68343-43
  • The Maru Special, Japanese Naval Vessels No.132 Japanese Submarines I "Revised edition", Ushio Shobō (Japan), February 1988, Book code 68344-36

{{Ro-100 class submarines}}

{{WWII Japanese ships}}

Category:Submarine classes

Category:Submarines of the Imperial Japanese Navy

Category:Japan campaign