HMS Alliance (P417)
Amphion class submarine of the Royal Navy / From Wikipedia, the free encyclopedia
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HMS Alliance (P417/S67) is a Royal Navy A-class, Amphion-class or Acheron-class submarine, laid down towards the end of the Second World War and completed in 1947. The submarine is the only surviving example of the class, having been a memorial and museum ship since 1981.
HMS Alliance on display at Royal Navy Submarine Museum | |
History | |
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United Kingdom | |
Ordered | 1943 Emergency war programme |
Builder | Vickers Armstrong, Barrow-in-Furness |
Laid down | 13 March 1945 |
Launched | 28 July 1945 |
Commissioned | 14 May 1947 |
Decommissioned | 1973, static training boat until August 1979 |
Identification | Pennant number: P417 (S67 from 1961) |
Status | Museum ship/memorial since 1981 at Royal Navy Submarine Museum |
General characteristics | |
Displacement |
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Length | 281 ft 4.75 in (85.7695 m) |
Beam | 22 ft 3 in (6.78 m) |
Draught | 17 ft (5.2 m) |
Propulsion | Two 2,150 hp (at 450 rpm) supercharged Vickers 8-cylinder diesel engine, Two 625 hp electric motors for use underwater, driving two shafts |
Speed |
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Range |
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Endurance | 36 hours submerged at 2.5 knots |
Test depth | 500 ft (150 m) |
Complement | 5 officers, 56 ratings (63 ratings after modernisation in 1960) |
Armament |
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The Amphion-class submarines were designed for use in the Far East, where the size of the Pacific Ocean made long-range, high surface speed and relative comfort for the crew important features to allow for much larger patrol areas and longer periods at sea than British submarines operating in the Atlantic or Mediterranean had to contend with. Alliance was one of the seven A-class boats completed with a snort mast - the other boats all had masts fitted by 1949.