RO35 1943
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| 呂35 [RO35] | Mitsubishi, Kobe | 10.1941 | 4.6.1942 | 3.1943 | sunk 25.8.1943 | ||
| 呂36 [RO36] | Mitsubishi, Kobe | 3.1942 | 14.10.1942 | 5.1943 | sunk 13.6.1944 | ||
| 呂37 [RO37] | Mitsubishi, Kobe | 10.1941 | 30.6.1942 | 6.1943 | sunk 22.1.1944 | ||
| 呂38 [RO38] | Mitsubishi, Kobe | 6.1942 | 24.12.1942 | 7.1943 | sunk 24.11.1943 | ||
| 呂39 [RO39] | Sasebo K K | 8.1942 | 6.3.1943 | 9.1943 | sunk 2.2.1944 | ||
| 呂40 [RO40] | Mitsubishi, Kobe | 8.1942 | 6.3.1943 | 9.1943 | sunk 16.2.1944 | ||
| 呂41 [RO41] | Mitsubishi, Kobe | 10.1942 | 5.5.1943 | 11.1943 | sunk 23.3.1945 | ||
| 呂42 [RO42] | Sasebo K K | 4.1942 | 25.10.1942 | 8.1943 | sunk 11.6.1944 | ||
| 呂43 [RO43] | Mitsubishi, Kobe | 10.1942 | 5.6.1943 | 12.1943 | sunk 26.2.1945 | ||
| 呂44 [RO44] | Tamano Zosen, Tamano | 2.1942 | 11.11.1942 | 9.1943 | sunk 16.6.1944 | ||
| 呂45 [RO45] | Mitsubishi, Kobe | 10.1942 | 21.7.1943 | 1.1944 | sunk 30.4.1944 | ||
| 呂46 [RO46] | Mitsubishi, Kobe | 6.1942 | 23.4.1943 | 2.1944 | sunk 18.4.1945 | ||
| 呂47 [RO47] | Tamano Zosen, Tamano | 12.1942 | 20.8.1943 | 1.1944 | sunk 25.9.1944 | ||
| 呂48 [RO48] | Mitsubishi, Kobe | 3.1942 | 15.10.1943 | 3.1944 | sunk 14.7.1944 | ||
| 呂49 [RO49] | Tamano Zosen, Tamano | 11.1942 | 3.8.1943 | 5.1944 | sunk 5.4.1945 | ||
| 呂50 [RO50] | Tamano Zosen, Tamano | 2.1943 | 27.11.1943 | 7.1944 | surrendered 8.1945, scuttled 1.4.1946 | ||
| 呂55 [RO55] | Tamano Zosen, Tamano | 8.1943 | 23.4.1944 | 9.1944 | sunk 9.2.1945 | ||
| 呂56 [RO56] (ex-呂75 [RO75]) | Tamano Zosen, Tamano | 12.1943 | 5.7.1944 | 11.1944 | sunk 9.4.1945 |
|
Displacement standard, t |
960 |
|
Displacement normal, t |
1115 / 1447 |
|
Length, m |
76.5 pp 79.0 wl 80.5 oa |
|
Breadth, m |
7.05 |
|
Draught, m |
4.07 |
|
No of shafts |
2 |
|
Machinery |
2 Kampon diesels / 2 electric motors |
|
Power, h. p. |
4200 / 1200 |
|
Max speed, kts |
19.7 / 8 |
|
Fuel, t |
diesel oil 115 |
|
Endurance, nm(kts) |
5000(16) / 45(5) |
|
Armament |
1 x 1 - 76/40 88-shiki, 1 x 2 - 25/60 96-shiki or 1 x 2 - 13.2/76, 4 - 533 TT (bow, 10) |
|
Electronic equipment |
presumably 93-shiki sonar, 93-shiki hydrophone |
|
Complement |
54 - 61 |
|
Diving depth operational, m |
75 |
Project history: Kaichu 6 (Medium Admiralty 6) type. Development of Kaichu 5 type. Larger and a little bit faster than predecessors, but with smaller endurance. Originally artillery was not provided, however 76mm gun was installed during outfitting. In total under 4th and 5th Supplementary programmes of 1939 and 1941, and also under the 1942 War programmes (basic and additional) building of 88 submarines was scheduled (RO49-56, 70-74, 76-99, 200-227 and nine unnamed hulls No715-723). Actually 18 submarines entered service, orders for remaining (RO51-54, 70-74, 76-99 and 200-227) were cancelled in 1943. Nos715-723 were never ordered.
Modernizations: None.
Naval service:RO35 was sunk 25.8.1943 SE off San Cristobal by US destroyer Patterson. RO38 after 19.11.1943 was lost between Truk and Gilbert Islands. RO37 was sunk 22.1.1944 E off San Cristobal by US destroyer Buchanan. RO39 was sunk 2.2.1944 W off Gilbert Islands by US destroyer Walker. RO40 was sunk 16.2.1944 at Kwajalein by US destroyer Phelps and minesweeper Sage. RO45 was sunk 30.4.1944 at Truk by US destroyers MacDonough, Stephen Potter and carrier aircraft. RO42 was sunk 10.6.1944 at Kwajalein by US escort destroyer Bangust. RO36 was sunk 13.6.1944 at Saipan by US destroyer Melvin. RO44 was sunk 16.6.1944 E off Eniwetok by US escort destroyer Burden R. Hastings. RO48 after 14.7.1944 was lost, possibly she was sunk 14.7.1944 at Saipan by US escort destroyer William Ñ. Miller. RO47 after 24.9.1944 was lost, presumably sunk 26.9.1944 in Carolina Islands area by US escort destroyer McCoy Reynolds. RO55 was sunk 7.2.1945 at Luzon by US escort destroyer Thomason. RO43 was sunk 26.2.1945 at Iwojima by US carrier aircraft. RO41 was sunk 23.3.1945 SE off Okinawa by US destroyer Haggard. RO49 after 25.3.1945 was lost, possibly sunk 5.4.1945 at Okinawa by US destroyer Hudson. RO56 after 18.3.1945 was lost, possibly she was sunk at Okinawa 9.4.1945 by US destroyers Mertz and Monssen. RO46 after 17.4.1945 was lost, possibly sunk at Okinawa 25.4.1945 by US fast personnel transport Horace A. Bass (under other version, she was sunk 18.4.1945 at Wake by US submarine Sea Owl). RO50 was scuttled by Americans 1.4.1946.
RO50
© Ivan Gogin, 2008-14