HMS D7
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| History | |
|---|---|
 United Kingdom | |
| Name | HMS D7 |
| Builder | Chatham Dockyard |
| Laid down | 14 February 1910 |
| Launched | 14 January 1911 |
| Commissioned | 14 December 1911 |
| Fate | Sold 19 December 1921 to H. Pounds |
| General characteristics | |
| Class & type | D-class submarine |
| Displacement | Surfaced= 483 tons / Submerged= 595 tons |
| Length | 163.0 ft (49.7 m) (oa) |
| Beam | 13.6 ft (4.1 m) (oa) |
| Propulsion | 550 hp (410 kW) electric 1,750 hp (1,300 kW) diesel twin screws |
| Speed |
|
| Range |
|
| Complement | 25 |
| Armament | 3 x 18-inch (46 cm) torpedo tubes (2 forward, one aft) |
HMS D7 was one of eight D-class submarines built for the Royal Navy during the first decade of the 20th century.
The D-class submarines were designed as improved and enlarged versions of the preceding C class, with diesel engines replacing the dangerous petrol engines used earlier. D3 and subsequent boats were slightly larger than the earlier boats. They had a length of 164 feet 7 inches (50.2 m) overall, a beam of 20 feet 5 inches (6.2 m) and a mean draught of 11 feet 5 inches (3.5 m). They displaced 495 long tons (503 t) on the surface and 620 long tons (630 t) submerged.[1] The D-class submarines had a crew of 25 officers and ratings and were the first to adopt saddle tanks.[2]
For surface running, the boats were powered by two 600-brake-horsepower (447 kW) diesels, each driving one propeller shaft. When submerged each propeller was driven by a 275-horsepower (205 kW) electric motor. They could reach 14 knots (26 km/h; 16 mph) on the surface and 9 knots (17 km/h; 10 mph) underwater. On the surface, the D class had a range of 2,500 nautical miles (4,600 km; 2,900 mi) at 10 knots (19 km/h; 12 mph).[2]
The boats were armed with three 18-inch (45 cm) torpedo tubes, two in the bow and one in the stern. They carried one reload for each tube, a total of six torpedoes.[2]