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United Kingdom - Royal Navy
Porpoise class Patrol/Attack Submarine

 

 
 

 

Ships:
S 01 HMS Porpoise (1958)
S 02 HMS Rorqual
(1958)
S 03 HMS Narwhal
(1958)
S 04 HMS Grampus
(1958)
S 05 HMS Finwhale
(1960)
S 06 HMS Cachalot
(1959)
S 07 HMS Sealion
(1961)
S 08 HMS Walrus
(1961)
 
Specifications:
Length: 88 meters (290 ft)
Beam: 8,1 meters (26 ft 7 in)
Draft: 5,5 meters (18 ft)
Displacement: 2080 tons (surfaced) / 2450 tons (submerged)
Speed: 12 knots (22 km/h) surfaced / 17 knots (31 km/h) submerged
Range: 9000 NM (17000 km) at 12 knots (22 km/h)
Complement: 71

Propulsion:
2 x Admiralty Standard range diesel generators (1650 hp / 1230 KW)
2 x English Electric electric motors (12000 hp / 8900 KW)
2 shafts / 2 propellers

Armament:
8 x 21 inches (533mm) torpedo tubes / 6 bow, 2 stern
30 x
Mark 8 or Mark 23 torpedoes / later Mark 24 Tigerfish torpedoes

 

The Porpoise class was an eight-boat class of diesel-electric submarines operated by the Royal Navy. This class was originally designated patrol submarines, then attack. They were the first conventional British submarines to be built after the end of World War II. Their design was, in many ways, influenced by the German WWII-era Type XXI U-boats.


Design:

The Porpoise class were larger but shorter than their T-class predecessors and used a much improved steel known as UXW. This, and improved design and construction techniques allowed much deeper diving. It was found in tests that the unusually long engine room was liable to collapse, so there were extra large frames in this section, which proved to be something of an operational inconvenience.

Designed with a top speed of 18 knots (33 km/h; 21 mph), the boats were capable of 17 knots (31 km/h; 20 mph), or 16 knots (30 km/h; 18 mph) once fitted with silenced propellers. However, quieter running was felt to be a positive trade off for the reduced speed. The Porpoise class were exceptionally quiet underwater, more so than their NATO counterparts and far more so than the Soviet Whiskeys. This was in part due to careful attention to detail in the mounting of machinery, and advances made in propeller design to prevent cavitation. Initially, the silenced propellers actually set up a distinctive resonant "singing", and it was said that Rorqual was once identified leaving the River Clyde from a listening station from Long Island. However, grooves were cut into the propellers and injected with a damping filler which cured the problem; Rorqual was later able to surface undetected off the Statue of Liberty. The silent running abilities made their sonar equipment particularly effective.

Each submarine's armament consisted of eight 21 in (530 mm) torpedo tubes; six in the bow, and two in the stern. Initially, up to 30 Mark 8 or Mark 23 torpedoes were carried, although these were replaced in the 1970s by the Mark 24 Tigerfish torpedo. The class were also the first since the World War I-era R-class to not carry a deck gun.

The Porpoises were far more capable than previous submarine classes in operating for prolonged periods, thanks to much improved air recirculation and cleaning systems. The class also performed excellently in clandestine operations, such as surveillance and inserting special forces.

The first Porpoise-class boats were launched in 1958 during the ever increasing threat of the Soviet Union's submarine fleet. The Porpoise class boats were all decommissioned by the 1980s. The Oberon-class submarines, which were almost identical to the Porpoises, and the first of which was commissioned in 1961, survived their predecessor only a little longer, all being decommissioned in the early 1990s.

source: wikipedia

 

Ships:

S 01 HMS Porpoise
Builder:
Vickers-Armstrongs Shipbuilding, Barrow-in-Furness, Cumbria, UK
Laid down:

Launched:
April 25, 1956
Commissioned:
April 17, 1958
Decommissioned: 1982
Fate:
sunk as a target in 1985

S 02 HMS Rorqual
Builder:
Vickers-Armstrongs Shipbuilding, Barrow-in-Furness, Cumbria, UK
Laid down:

Launched:
December 5, 1956
Commissioned:
1958
Decommissioned: 1977
Fate:
sold for scrap / scrapped

S 03 HMS Narwhal
Builder:
Vickers-Armstrongs Shipbuilding, Barrow-in-Furness, Cumbria, UK
Laid down:

Launched:
October 25, 1957
Commissioned:
1958
Decommissioned: ?
Fate:
sunk as a target in 1985

S 04 HMS Grampus
Builder:
Cammell Laird Shipbuilding, Birkenhead, UK
Laid down:
1955
Launched:
May 30, 1957
Commissioned:
December 19, 1958
reclassified Harbour Training Vessel 1976-79
Decommissioned: 1979
Fate:
sunk as a target in 1980

S 05 HMS Finwhale
Builder:
Cammell Laird Shipbuilding, Birkenhead, UK
Laid down:

Launched:
July 21, 1959
Commissioned:
August 19, 1960
used as Harbour Training Vessel in 1979-87
Decommissioned: 1987
Fate:
sold for scrap / scrapped in Spain

S 06 HMS Cachalot
Builder:
Scotts Shipbuilding & Engineering, Greenock, Scotland, UK
Laid down:
August 1, 1955
Launched:
December 11, 1957
Commissioned:
September 1, 1959
Decommissioned: 1979
Fate:
sold for scrap / scrapped

S 07 HMS Sealion
Builder:
Cammell Laird Shipbuilding, Birkenhead, UK
Laid down:
June 5, 1958
Launched:
December 31, 1959
Commissioned:
July 25, 1961
Decommissioned: December 1987
Fate:
sold for scrap / scrapped in 1990

S 08 HMS Walrus
Builder:
Scotts Shipbuilding & Engineering, Greenock, Scotland, UK
Laid down:
February 12, 1958
Launched:
September 22, 1959
Commissioned: February 10, 1961
Decommissioned: 1987?
Fate:
sold for scrap / scrapped in 1991

 

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