Ro-100-class submarine

Ro-101 in 1943
Class overview
Name	Ro-100 class submarine
Builders	Kure Naval Arsenal Kawasaki Shipbuilding
Operators	Imperial Japanese Navy
Built	1941-1944
In commission	1942-1945
Planned	18
Completed	18
Lost	18
General characteristics
Type	Submarine
Displacement	525 long tons (533 t) surfaced 782 long tons (795 t) submerged
Length	60.90 m (199 ft 10 in) overall
Beam	6.00 m (19 ft 8 in)
Draft	3.51 m (11 ft 6 in)
Propulsion	2 × Kampon Mk.24 Model 6 diesels 1,000 bhp surfaced 760 shp submerged 2 shafts
Speed	14.2 knots (26.3 km/h) surfaced 8 knots (15 km/h) submerged
Range	3,500 nmi (6,500 km) at 12 knots (22 km/h) surfaced 60 nmi (110 km) at 3 knots (5.6 km/h) submerged (After expanded the fuel tanks) 6,000 nmi (11,000 km) at 12 knots (22 km/h) surfaced
Test depth	75 m (246 ft)
Complement	55 Ro-109: 65 Ro-110: 47
Armament	• 4 × torpedo tubes • 8 × Type 95 torpedoes • 2 × Type 96 25mm AA guns

The Ro-100 class submarine (呂第一〇〇型潜水艦, Ro-100-gata sensuikan) is mediun size submarine of the Imperial Japanese Navy (IJN), serving during World War II. IJN called Small Type (小型, Ko gata) or Submarine-Small Type (潜小型, Sen-Shō gata) officially.

Construction

Project number S45. In 1940, the IJN was planned a point-defence submarine, because the IJN wanted to use their large-sized submarine into naval battles. 18 boats were built in 1941-1944 under the Temporal Naval Armaments Supplement Programme (マル臨計画, Maru Rin Keikaku, Boat #210-218) and the Rapidly Naval Armaments Supplement Programme (マル急計画, Maru Kyū Keikaku, Boat #400-408).

Boats

Boat #	Name	Builder	Laid down	Launched	Completed	Results	Fate
210	Ro-100	Kure Naval Arsenal	30-06-1941	06-12-1941	23-08-1942		Sunk by naval mine off Bougainville Island 25-11-1943.
211	Ro-101	Kawasaki-Kōbe Shipyard	30-09-1941	17-04-1942	31-10-1942		Sunk by USS Saufley and PBY at southeast of San Cristobal 15-09-1943.
212	Ro-102	Kawasaki-Kōbe Shipyard	30-09-1941	17-04-1942	17-11-1942		Sunk by USS PT-150 and USS PT-152 at Milne Bay 14-05-1943.
213	Ro-103	Kure Naval Arsenal	30-06-1941	06-12-1941	21-10-1942	Sank USS Aludra 23-06-1943 Sank USS Deimos 23-06-1943	Disappeared after 28-07-1943.
214	Ro-104	Kawasaki-Kōbe Shipyard	19-11-1941	11-07-1942	25-02-1943		Sunk by USS England at north of Admiralty Islands 23-05-1944.
215	Ro-105	Kawasaki-Kōbe Shipyard	19-11-1941	11-07-1942	05-03-1943		Sunk by USS England at north of Admiralty Islands 31-05-1944.
216	Ro-106	Kure Naval Arsenal	17-12-1941	30-05-1942	26-12-1942		Sunk by USS England at north of Admiralty Islands 22-05-1944.
217	Ro-107	Kure Naval Arsenal	17-12-1941	30-05-1942	26-10-1942		Sunk by USS Taylor at east of Kolombangara 21-07-1943.
218	Ro-108	Kawasaki-Kōbe Shipyard	20-04-1942	26-10-1942	20-04-1943	Sank USS Henley 03-10-1943	Sunk by USS England at north of Admiralty Islands 26-05-1944.
400	Ro-109	Kawasaki-Kōbe Shipyard	20-04-1942	26-10-1942	29-04-1943		Sunk by USS Horace A. Bass at south of Okinawa Island 25-04-1945.
401	Ro-110	Kawasaki-Kōbe Shipyard	20-08-1942	26-01-1943	06-07-1943		Sunk by HMAS Launceston, HMAS Ipswich and INS Jumna at Bay of Bengal 12-02-1944.
402	Ro-111	Kawasaki-Kōbe Shipyard	20-08-1942	26-01-1943	10-07-1943	Sank RMS Peshawar 23-12-1943	Sunk by USS Taylor at north of Admiralty Islands 10-06-1944.
403	Ro-112	Kawasaki-Senshū Shipyard	20-06-1942	25-03-1943	14-09-1943		Sunk by USS Batfish at Luzon Strait 11-02-1945.
404	Ro-113	Kawasaki-Senshū Shipyard	11-07-1942	24-04-1943	12-10-1943		Sunk by USS Batfish at Luzon Strait 12-02-1945.
405	Ro-114	Kawasaki-Senshū Shipyard	12-10-1942	19-06-1943	20-11-1943		Sunk by USS Melvin and USS Wadleigh at east of Saipan 17-06-1944.
406	Ro-115	Kawasaki-Senshū Shipyard	12-10-1942	19-06-1943	30-11-1943		Sunk by USS Jenkins, USS O'Bannon and USS Bell at west of Mindoro 01-02-1945.
407	Ro-116	Kawasaki-Senshū Shipyard	16-01-1943	13-09-1943	21-01-1944		Sunk by USS England at north of Admiralty Islands 24-05-1944.
408	Ro-117	Kawasaki-Senshū Shipyard	16-01-1943	13-09-1943	31-01-1944		Sunk by USN patrol bomber at southeast of Saipan 24-05-1944.

Books

• "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