Tuna 1943
| No | Name | Builder | Laid down | Launched | Comm | Fate |
| SS198 | Tambor | Electric Boat, Groton | 1/1939 | 20/12/1939 | 6/1940 | stricken 9/1959 |
| SS199 | Tautog | Electric Boat, Groton | 3/1939 | 27/1/1940 | 7/1940 | stricken 9/1959 |
| SS200 | Thresher | Electric Boat, Groton | 4/1939 | 27/3/1940 | 8/1940 | stricken 12/1947 |
| SS201 | Triton | Portsmouth N Yd | 7/1939 | 25/3/1940 | 8/1940 | sunk 15/3/1943 |
| SS202 | Trout | Portsmouth N Yd | 8/1939 | 21/5/1940 | 11/1940 | sunk 29/2/1944 |
| SS203 | Tuna | Mare Island N Yd, Vallejo | 7/1939 | 2/10/1940 | 1/1941 | sunk as target 24/9/1948 |
| SS206 | Gar | Electric Boat, Groton | 12/1939 | 7/11/1940 | 4/1941 | stricken 5/1959 |
| SS207 | Grampus | Electric Boat, Groton | 2/1940 | 23/12/1940 | 5/1941 | sunk 5/3/1943 |
| SS208 | Grayback | Electric Boat, Groton | 4/1940 | 31/1/1941 | 6/1941 | sunk 26/2/1944 |
| SS209 | Grayling | Portsmouth N Yd | 12/1939 | 4/9/1940 | 3/1941 | sunk 9/9/1943 |
| SS210 | Grenadier | Portsmouth N Yd | 4/1940 | 29/11/1940 | 5/1941 | sunk 22/4/1943 |
| SS211 | Gudgeon | Mare Island N Yd, Vallejo | 11/1939 | 25/1/1941 | 4/1941 | sunk 18/4/1944 |
|
Displacement standard, t |
|
|
Displacement normal, t |
1475 / 2370 |
|
Length, m |
92.2 wl 93.6 oa |
|
Breadth, m |
8.31 |
|
Draught, m |
4.57 |
|
No of shafts |
2 |
|
Machinery |
4 diesels / 2 electric motors |
|
Power, h. p. |
5400 / 2740 |
|
Max speed, kts |
20 / 8.75 |
|
Fuel, t |
diesel oil 374 - 385 |
| Endurance, nm (kts) | 10000 (10) / 60 (5) |
|
Armament |
SS198 - 200, 203, 206, 209: 1 x 1 - 127/51 Mk 9, 2 x 1 - 12.7/90, 10 - 533 TT (24 torpedoes or 4 torpedoes and 40 mines, 6 bow, 4 stern) SS201, 202, 207, 208, 210, 211: 1 x 1 - 76/50 Mk 17/18/21, 2 x 1 - 12.7/90, 10 - 533 TT (24 torpedoes or 4 torpedoes and 40 mines, 6 bow, 4 stern) |
| Sensors |
sonar |
|
Complement |
60 |
|
Diving depth operational, m |
75 (designed), 90 (possible) |
Ship project history: Ò class project was developed on the basis of Salmon and Sargo classes with increased to 10 TT number and strengthened pressure hull. In remaining they are close to prototype. Double-hulled, operational diving depth was 90 m ( designed destruction depth was 150m). Diesels were directly connected with propeller shafts.
They were built under FY1939 (SS198-203) and FY1940 programs (SS206-211).
Modernizations: 1942 - 1943, all survived: CT was rebuilt; - 1 x 1 - 76/50 or 1 x 1 - 127/51, 2 x 1 - 12.7/90; + 1 x 1 - 102/50 Mk 9 or 1 x 1 - 127/25 Mk 17, (1 x 1 - 40/56 Bofors, 1 x 1 - 20/70 Oerlikon) or 2 x 1 - 20/70 Oerlikon
Naval service: Grampus was lost by unknown cause in February-March, 1943, most likely, sunk 5/3/1943 off New Anglia by Japanese destroyers Minegumo and Murasame. Triton 15/3/1943 was sunk N off Admiralty Islands by Japanese destroyers. Grenadier 21/4/1943 was badly damaged by Japanese aircraft in Malacca strait by Japanese aircraft and 22/4/1943 was scuttled by own crew at Penang. Grayling was lost by unknown cause in August-September, 1943, possibly, sunk by Japanese passenger vessel Hokusu Maru 9/9/1943 off Luzon. Trout 29/2/1944 was sunk SE off Okinawa by Japanese destroyers Asashimo, Kisninami and Okinami. Grayback was lost in February-March, 1944, possibly, sunk 26/2/1944 in the East China Sea by Japanese torpedo bomber B5N. Gudgeon in April-May, 1944 was lost by unknown cause near Mariana Islands, probably by Japanese aircraft.
Tautog 1940
© Ivan Gogin, 2008-10