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 × 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-hyaku-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 Ko Type submarine (小型潜水艦 Ko-gata sensuikan, "Small Type Submarine") or Senshō Type submarine (潜小型潜水艦 Sen-Shō-gata sensuikan, "Submarine-Small Type"). The type name, was shortened to Sensuikan Ko-gata (潜水艦小型 Submarine-Small Type).[1]
Construction
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
| Boat # | Name | Builder | Laid down | Launched | Completed | Results | Fate |
| 210 | Ro-100 [2] | 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.)[3] 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.[4] | |
| 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
- ↑ The 小 read as "Shō" and the 潜小 read as "Sen-Shō", but the 小型 read as "Ko-gata" and the 潜小型 read as "Sen-Shō-gata" in Japanese.
- ↑ 呂号第100潜水艦 (Ro-Gō Dai-100 Sensuikan). The same shall apply hereinafter.
- ↑ Holmes, W. J., 1966, Undersea Victory: The Influence of Submarine Operations on the War in the Pacific, pg. 428-429
- ↑ Which sub was it? http://www.ussbatfish.com/whichsub.html
Bibliography
- "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
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