Odin 1940
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| Odin | P84 - N84 | Chatham DYd | 7.1927 | 5.5.1928 | 12.1929 | sunk 13.6.1940 | |
| Olympus | P35 - N35 | Beardmore, Dalmuir | 4.1927 | 11.12.1928 | 6.1930 | sunk 8.5.1942 | |
| Orpheus | P46 - N46 | Beardmore, Dalmuir | 4.1927 | 26.2.1929 | 9.1930 | sunk 19.6.1940 | |
| Osiris | P67 - N67 | Vickers-Armstrong, Barrow | 5.1927 | 19.5.1928 | 2.1929 | BU 9.1946 | |
| Oswald | P58 - N58 | Vickers-Armstrong, Barrow | 5.1927 | 19.6.1928 | 5.1929 | sunk 1.8.1940 | |
| Otus | P92 - N92 | Vickers-Armstrong, Barrow | 5.1927 | 31.8.1928 | 7.1929 | scuttled 9.1946 |
|
Displacement standard, t |
1475 |
|
Displacement normal, t |
1781 / 2038 |
|
Length, m |
86.4 |
|
Breadth, m |
9.12 |
|
Draught, m |
4.90 |
|
No of shafts |
2 |
|
Machinery |
2 Admiralty diesels / 2 electric motors |
|
Power, h. p. |
4520 / 1390 |
|
Max speed, kn |
17.5 / 8 |
|
Fuel, t |
diesel oil 174 |
|
Endurance, nm(kts) |
5180(11.4) / 50(4) |
|
Armament |
1 x 1 - 102/40 QF Mk IV, 8 - 533 TT (6 bow, 2 stern, 14) |
| Sensors | type 118 sonar |
|
Complement |
53 |
| Diving depth operational, m | 95 |
Project history: Design of "O" class submarines was developed on the basis of "L" class. New ships intended for service in the Far East and so they required increased endurance and improved seaworthiness in comparison with prototype. Lead Oberon had saddle-tank construction and was built under the 1923 Programme, operational diving depth was 60 m, maximal was 155 m. Oil fuel tanks were out of a pressure hull and were leaked at big depth. It was possible to be saved of this lack during repair, when riveted tanks were been replaced by welded (also fuel stowage has increased to 186t). Designed speed was 15/9kts, but it has not been even reached. Oberon became the first British submarine with sonar provided even at designing. Almost simultaneously with Oberon the order for two submarines was given out by the Australian government. Design of these boats was developed by firm Vickers-Armstrong, and they favourably differed from Admiralty designed Oberon. At the expense of minor alteration of hull lines and form of fore end Australian submarines have reached designed speed.
6 more units have built under the 1926 Programme (3rd group), their design has been developed on the basis of the Australian ships. A little increased dimensions and usage of more powerful diesels allowed to increase surface speed. Besides, an operational diving depth have increased to 95m. Stern TT had no spare torpedoes.
Modernizations: 1930s, all: - 1 x 1 - 102/40 QF Mk IV; + 1 x 1 - 102/40 QF Mk XII
1942 - 1943, all survived: + 1 x 1 - 20/70 Oerlikon Mk II/IV, type 286W or type 291W radar
1/1946, Osiris, Otus: 1 x 1 - 102/40 S Mk I, 1 x 1 - 20/70 Mk IIA S/M, 8 - 533 TT, type 286W or type 291W radar, type 118 sonar
Naval service: Odin was sunk by Italian destroyer Strale 13.6.1940 in the central Mediterranean. Orpheus was sunk by Italian destroyer Turbine at Tobruk 19.6.1940. Oswald was sunk 1.8.1940 by Italian destroyer Vivaldi in Mediterranean. Olympus was lost on a mine off Malta 8.5.1942.
© Ivan Gogin, 2008-15