Ro-100-class submarine

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Japanese submarine Ro-101 in 1943.jpg
Ro-101 in 1943
Class overview
Name: Ro-100-class submarine
Builders: Kure Naval Arsenal
Kawasaki Shipbuilding
Operators: Naval Ensign of Japan.svg 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 × 533 mm (21 in) torpedo tubes
• 8 × Type 95 torpedoes
• 2 × Type 96 25mm AA guns

The Ro-100-class submarine (呂百型潜水艦 Ro-100-gata Sensuikan?) was a medium size submarine of the Imperial Japanese Navy (IJN), serving during World War II. The IJN official designation for this class was Small Type (小型 Ko gata?) or Submarine-Small Type (潜小型 Sen-Shō gata?).

Construction[edit]

Project number S45. In 1940, the IJN planned a point-defence submarine, because the IJN wanted to use their large-sized submarine for naval battles. 18 boats were built in 1941-1944 under the Maru Rin Programme (Boat #210-218) and the Maru Kyū Programme (Boat #400-408).

Boats[edit]

Boat # Name Builder Laid down Launched Completed Results Fate
210 Ro-100 [1] Kure Naval Arsenal 1941-06-30 1941-06-12 1942-08-23 Sunk by naval mine off Bougainville Island 1943-11-25.
211 Ro-101 Kawasaki-Kōbe Shipyard 1941-09-30 1942-04-17 1942-10-31 Sunk by USS Saufley and PBY at southeast of San Cristobal 1943-09-15.
212 Ro-102 Kawasaki-Kōbe Shipyard 1941-09-30 1942-04-17 1942-11-17 Sunk by USS PT-150 and USS PT-152 at Milne Bay 1943-05-14.
213 Ro-103 Kure Naval Arsenal 1941-06-30 1941-12-06 1942-10-21 Sank USS Aludra 1943-06-23
Sank USS Deimos 1943-06-23
Disappeared after 1943-07-28.
214 Ro-104 Kawasaki-Kōbe Shipyard 1941-11-19 1942-07-11 1943-02-25 Sunk by USS England at north of Admiralty Islands 1944-05-23.
215 Ro-105 Kawasaki-Kōbe Shipyard 1941-11-19 1942-07-11 1943-03-05 Sunk by USS England at north of Admiralty Islands 1944-05-31.
216 Ro-106 Kure Naval Arsenal 1941-12-17 1942-05-30 1942-12-26 Sunk by USS England at north of Admiralty Islands 1944-05-22.
217 Ro-107 Kure Naval Arsenal 1941-12-17 1942-05-30 1942-10-26 Sunk by USS Taylor at east of Kolombangara 1943-07-21.
218 Ro-108 Kawasaki-Kōbe Shipyard 1942-04-20 1942-10-26 1943-04-20 Sank USS Henley 1943-10-03 Sunk by USS England at north of Admiralty Islands 1944-05-26.
400 Ro-109 Kawasaki-Kōbe Shipyard 1942-04-20 1942-10-26 1943-04-29 Sunk by USS Horace A. Bass at south of Okinawa Island 1945-04-25.
401 Ro-110 Kawasaki-Kōbe Shipyard 1942-08-20 1943-01-26 1943-07-06 Sunk by HMAS Launceston, HMAS Ipswich and INS Jumna at Bay of Bengal 1944-02-12.
402 Ro-111 Kawasaki-Kōbe Shipyard 1942-08-20 1943-01-26 1943-07-10 Sank RMS Peshawar 1943-12-23 Sunk by USS Taylor at north of Admiralty Islands 1944-06-10.
403 Ro-112 Kawasaki-Senshū Shipyard 1942-06-20 1943-03-25 1943-09-14 Sunk by USS Batfish at Luzon Strait 1945-02-11.
404 Ro-113 Kawasaki-Senshū Shipyard 1942-07-11 1943-04-24 1943-10-12 Sunk by USS Batfish at Luzon Strait 1945-02-12.
405 Ro-114 Kawasaki-Senshū Shipyard 1942-10-12 1943-06-19 1943-11-20 Sunk by USS Melvin and USS Wadleigh at east of Saipan 1944-06-17.
406 Ro-115 Kawasaki-Senshū Shipyard 1942-10-12 1943-06-19 1943-11-30 Sunk by USS Jenkins, USS O'Bannon and USS Bell at west of Mindoro 1945-02-01. Holmes (see ref.)[2] contradicts the identification, 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 USS Batfish on 1945-02-10.[3]
407 Ro-116 Kawasaki-Senshū Shipyard 1943-01-16 1943-09-13 1944-01-21 Sunk by USS England at north of Admiralty Islands 1944-05-24.
408 Ro-117 Kawasaki-Senshū Shipyard 1943-01-16 1943-09-13 1944-01-31 Sunk by USN patrol bomber at southeast of Saipan 1944-05-24.

Footnotes[edit]

  1. ^ 呂号第100潜水艦 (Ro-Gō Dai-100 Sensuikan?). The same shall apply hereinafter.
  2. ^ Holmes, W. J., 1966, Undersea Victory: The Influence of Submarine Operations on the War in the Pacific, pg. 428-429
  3. ^ Which sub was it? http://www.ussbatfish.com/whichsub.html

Bibliography[edit]

  • "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