Otus 1969
Oberon 1979
Osiris 1990
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| Oberon | S09 | Chatham DYd | 28.11.1957 | 18.7.1959 | 24.2.1961 | sold 1987 | |
| Odin | S10 | Cammell Laird, Birkenhead | 27.4.1959 | 4.11.1960 | 3.5.1962 | BU 10.1991 | |
| Orpheus | S11 | Vickers-Armstrong, Barrow | 16.4.1959 | 17.11.1959 | 25.11.1960 | harbour TS 9.1987 | |
| Olympus | S12 | Vickers-Armstrong, Barrow | 4.3.1960 | 14.6.1961 | 7.7.1962 | to Canada 7.1989 (harbour TS) | |
| Osiris | S13 | Vickers-Armstrong, Barrow | 26.1.1962 | 29.11.1962 | 11.1.1964 | sold 10.1992 | |
| Onslaught | S14 | Chatham DYd | 8.4.1959 | 24.9.1960 | 14.8.1962 | BU 10.1991 | |
| Otter | S15 | Scotts, Greenock | 14.1.1960 | 15.5.1961 | 20.8.1962 | sold 3.1992 | |
| Oracle | S16 | Cammell Laird, Birkenhead | 26.4.1960 | 26.9.1961 | 14.2.1963 | BU 1997 | |
| Ocelot | S17 | Chatham DYd | 17.11.1960 | 5.5.1962 | 31.1.1964 | preserved 1992 | |
| Otus | S18 | Scotts, Greenock | 31.5.1961 | 17.10.1962 | 5.10.1963 | sold 1992 | |
| Opossum | S19 | Cammell Laird, Birkenhead | 21.12.1961 | 23.5.1963 | 5.6.1964 | BU 10.1996 | |
| Onyx (i) | Chatham DYd | 27.9.1962 | 29.2.1964 // --- | 23.9.1965 // --- | incomplete to Canada 1963 (Ojibwa) | ||
| Opportune | S20 | Scotts, Greenock | 26.10.1962 | 14.2.1964 | 28.12.1964 | BU 1996 | |
| Onyx (ii) | S21 | Cammell Laird, Birkenhead | 16.11.1964 | 18.8.1966 | 25.11.1967 | preserved 8.1991 |
|
Displacement standard, t |
1610 |
|
Displacement normal, t |
2030 / 2410 |
|
Length, m |
73.4 pp 88.5 oa |
|
Breadth, m |
8.10 |
|
Draught, m |
5.60 |
|
No of shafts |
2 |
|
Machinery |
2 16-cyl ASR 1 diesels / 2 English Electric electric motors |
|
Power, h. p. |
3680 / 6000 |
|
Max speed, kts |
12 / 17 |
|
Fuel, t |
diesel oil 258 |
|
Endurance, nm(kts) |
9000(12) / |
|
Armament |
8 - 533 TT (6 fwd, 2 aft, 30) |
|
Electronic equipment |
type 1002 radar, type 186, type 187C, type 2007 sonars, UAH ECM suite |
|
Complement |
64 |
|
Diving depth operational, m |
230 |
Project history: Although outwardly identical with the Porpoise class, these boats bear the same relationship to them as the Rothesay class frigates did to the Whitby class: a number of detailed improvements were incorporated to make a considerable overall improvement in efficiency. Orpheus was given an aluminium casing, but later boats adopted glass-fibre laminate. The particular feature of this class is its quietness, with all equipment soundproofed, but in addition a higher grade of steel permits a greater diving depth than the Porpoise class (believed to exceed 300m max). Onyx was bought on the stocks by the Royal Canadian Navy and launched as Ojibwa in 1964; a replacement was added to the programme. Ten were to be retained until replaced by the Upholder class, but when the SSK force was cut in 1991 they went out of service early.
The class was planned to be replaced by ten Upholder class SSKs in the late 1980s but the rapid rundown of submarine strength meant that most were retired without being replaced.
Modernizations: late 1970s, all: - type 1002 radar; + type 1006 radar
1985-1986, Otter, Opossum, Onyx; 1987-1989, Odin, Osiris, Onslaught, Oracle, Ocelot, Otus, Opportune: - type 187C sonar; + type 2051 sonar, TDHFCS CCS
1989, Osiris, Onslaught, Otter, Oracle, Ocelot, Opossum, Opportune, Onyx: - type 186 sonar, UAH ECM suite; + type 2024 sonar, UAL ESM suite
Naval service: No significant events.
Otus 1980
© Ivan Gogin, 2015