Clyde 1939
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| Thames | F71 - N71 | Vickers-Armstrong, Barrow | 1.1931 | 26.1.1932 | 9.1932 | sunk 23.7.1940 | |
| Severn | F57 - N57 | Vickers-Armstrong, Barrow | 3/1933 | 16.1.1934 | 1.1935 | BU 7?/1946 | |
| Clyde | F12 - N12 | Vickers-Armstrong, Barrow | 5/1933 | 15.3.1934 | 4/1935 | BU 7.1946 |
|
Displacement standard, t |
Thames: 1830 others: 1850 |
|
Displacement normal, t |
Thames: 2165 / 2680 others: 2206 / 2723 |
|
Length, m |
105.2 |
|
Breadth, m |
8.62 |
|
Draught, m |
Thames: 4.76 others: 4.85 |
|
No of shafts |
2 |
|
Machinery |
2 Admiralty supercharged diesels / 2 electric motors |
|
Power, h. p. |
10000 / 2500 |
|
Max speed, kn |
Thames: 22.5 / 10 others: 22 / 10 |
|
Fuel, t |
Thames: diesel oil 216 - 224 others: diesel oil 202 |
|
Endurance, nm(kts) |
6260(12.4) / 115(4) |
|
Armament |
Thames: 1 x 1 - 120/45 QF Mk IX, 2 x 1 - 12.7/62, 6 - 533 TT (bow; 12) others: 1 x 1 - 102/40 QF Mk XII, 2 x 1 - 12.7/62, 6 - 533 TT (bow; 12) |
| Sensors | type 120A sonar |
|
Complement |
61 |
| Diving depth operational, m | 60 |
Project history: Fleet submarines, designed for replacement of out-of-date "K" class. For achievement of the 22kts speed (speed of battleships), special 5000hp diesels were designed. Big size of the latter have compelled to refuse from stern TTs originally provided by the specification. In addition to main diesels 2 more 400hp diesel-generators for battery charging were installed. Double-hulled submarines, operational diving depth was 60m, maximal 95m. Fuel tanks, arranged out of a pressure hull, were welded.
Lead Thames was built under the 1929 Programme. It was originally supposed to built large series of similar ships, however Admiralty had soon refused the concept of fleet submarine and only three were completed instead of 20 planned. Two serial-built boats, Clyde (1931 Programme) and Severn (1932 Programme), differed from the lead ship a little: so, ballast tanks have been taken out in a hull superstructure to improve stability, and there was 102mm gun instead of 120mm.
Modernizations: 1935, Thames: - 1 x 1 - 120/45; + 1 x 1 - 102/40 QF Mk XII
1942 - 1943, Severn, Clyde: + 1 x 1 - 20/70 Oerlikon Mk II/IV, they also received ability to carry 12 M2 mines instead of torpedoes, + type 286W or type 291W radar
1/1946, Severn, Clyde: 1 x 1 - 102/40 S Mk I, 1 x 1 - 20/70 Mk IIA S/M, 6 - 533 TT, type 286W or type 291W radar, type 120A sonar
Naval service: Thames was lost on a mine off Norwegian coast 3.8.1940.
Severn 1939
© Ivan Gogin, 2008-15