Porpoise 1940
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| Porpoise | M14 - N14 | Vickers-Armstrong, Barrow | 9/1931 | 30.8.1932 | 4/1933 | sunk 16.1.1945 |
|
Displacement standard, t |
1500 |
|
Displacement normal, t |
1768 / 2053 |
|
Length, m |
88.1 |
|
Breadth, m |
9.09 |
|
Draught, m |
4.84 |
|
No of shafts |
2 |
|
Machinery |
2 Admiralty diesels / 2 electric motors |
|
Power, h. p. |
3300 / 1630 |
|
Max speed, kn |
15.5 / 8.75 |
|
Fuel, t |
diesel oil 155 - 190 |
|
Endurance, nm(kts) |
6300(10.6) / 64(4) |
|
Armament |
1 x 1 - 120/45 QF Mk IX, 6 - 533 TT (bow; 12), 50 M3 mines |
| Sensors | type 120 sonar |
|
Complement |
59 |
| Diving depth operational, m | 60 |
Project history: First, partly experimental unit of unique British special minelaying submarine class. Porpoise was built under the 1930 Programme. Design was created on basis of "Ð" class. Saddle-tank submarine had an operational diving depth 60m, maximal designed depth was 95m. Fuel tanks, arranged out of a pressure hull, were welded. Two horizontal mine tubes for 50 M3 mines placed in a superstructure and extended from an aft end to a bow on about 70m.
Modernizations: 1934: 1 x 1 - 120/45; + 1 x 1 - 102/40 QF Mk XII
1940s: submarine received ability to carry 12 M2 mines instead of torpedoes.
1942-1943: + type 286W or type 291 radar
Naval service: Porpoise was sunk by Japanese aircraft off Malayan coast 16.1.1945.
Porpoise 1935
© Ivan Gogin, 2008-10