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United Kingdom - Royal Navy Porpoise class Patrol/Attack Submarine |
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| 01/23 | ||||||||
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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) |
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| Specifications: | ||||||||
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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 for 30 x Mark 8 or Mark 23 Grog torpedoes later Mark 24 Tigerfish torpedoes |
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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 |
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 HMS Rorqual (S 02)  HMS Grampus (S 04)  HMS Grampus (S 04)  HMS Finwhale (S 05)  HMS Finwhale (S 05) HMS Cachalot (S 06)  HMS Sealion (S 07)  HMS Sealion (S 07) |
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