HMS Seahorse (98S)
HMS Seahorse
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| History | |
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 United Kingdom
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| Name: | HMS Seahorse |
| Builder: | Chatham Dockyard |
| Launched: | 15 November 1932 |
| Identification: | Pennant number: 98S |
| Fate: | Sunk 7 January 1940 |
| Badge: |
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| General characteristics | |
| Class and type: | S-class submarine |
| Displacement: |
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| Length: | 202 ft 6 in (61.7 m) |
| Beam: | 24 ft (7.3 m) |
| Draught: | 11 ft 11 in (3.6 m) |
| Installed power: |
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| Propulsion: |
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| Speed: |
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| Range: | 3,700 nmi (6,900 km; 4,300 mi) at 10 knots (19 km/h; 12 mph) surface; 64 nmi (119 km; 74 mi) at 2 knots (3.7 km/h; 2.3 mph) submerged |
| Test depth: | 300 feet (91.4 m) |
| Complement: | 38 |
| Armament: |
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HMS Seahorse was a first-batch S-class submarine (often called the Swordfish class) built for the Royal Navy during the 1930s. She lost at sea with all hands in 1940.
The S-class submarines were designed as successors to the L class and were intended to operate in the North and Baltic Seas. The submarines had a length of 202 feet 6 inches (61.7 m) overall, a beam of 24 feet (7.3 m) and a mean draft of 11 feet 11 inches (3.6 m). They displaced 730 long tons (740 t) on the surface and 927 long tons (942 t) submerged. The S-class submarines had a crew of 38 officers and ratings. They had a diving depth of 300 feet (91.4 m).
For surface running, the boats were powered by two 775-brake-horsepower (578 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 650-horsepower (485 kW) electric motor. They could reach 13.75 knots (25.47 km/h; 15.82 mph) on the surface and 10 knots (19 km/h; 12 mph) underwater. On the surface, the first-batch boats had a range of 3,700 nautical miles (6,900 km; 4,300 mi) at 10 knots (19 km/h; 12 mph) and 64 nmi (119 km; 74 mi) at 2 knots (3.7 km/h; 2.3 mph) submerged.
The boats were armed with six 21 inch (533 mm) torpedo tubes in the bow. They carried six reload torpedoes for a grand total of a dozen torpedoes. They were also armed with a 3-inch (76 mm) deck gun.
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