NAVYPEDIA

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Tautog 1940

Ships

No	Name	Yard No	Builder	Laid down	Launched	Comm	Fate
SS198	Tambor	35	Electric Boat, Groton	1.1939	20.12.1939	6.1940	stricken 9.1959
SS199	Tautog	36	Electric Boat, Groton	3.1939	27.1.1940	7.1940	stricken 9.1959
SS200	Thresher	37	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	39	Electric Boat, Groton	12.1939	7.11.1940	4.1941	stricken 5.1959
SS207	Grampus	40	Electric Boat, Groton	2.1940	23.12.1940	5.1941	sunk 5.3.1943
SS208	Grayback	41	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

Technical data

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 General Electric diesels / 4 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 21, 2 x 1 - 12.7/90, 10 - 533 TT (24 torpedoes or 4 torpedoes and 40 mines, 6 bow, 4 stern)
Electronic equipment	QCG, JK sonars
Complement	60
Diving depth operational, m	75 (designed), 90 (possible)

Standard scale images

Graphics

Project history

Т class design was developed on the basis of Salmon and Sargo classes with increased to 10 TT number and strengthened pressure hull. In remaining they were 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 Mk 1.2, 1 x 1 - 20/70 Mk 4) or 2 x 1 - 20/70 Mk 4, SD, SJ radars

1.1946, SS198-200, 203, 206: 10 - 533 TT (6 bow, 4 stern, 24), 1 x 1 - 102/50 Mk 12 or 1 x 1 - 127/25 Mk 40, (1 x 1 - 40/60 Mk 3, 1 x 1 - 20/70 Mk 10) or 2 x 1 - 20/70 Mk 10, SD, SJ radars, QCG sonar

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.