HMS G7
 A G class submarine before bow modification.
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| History | |
|---|---|
 United Kingdom | |
| Name | G7 |
| Builder | Armstrong Whitworth |
| Launched | 4 March 1916 |
| Commissioned | 21 August 1916 |
| Fate | Missing October 1918 in the North Sea. Presumed sunk. |
| General characteristics | |
| Class and type | G-class submarine |
| Displacement |
|
| Length | 187 ft 1 in (57.0 m) |
| Beam | 22 ft 8 in (6.9 m) |
| Draught | 13 ft 4 in (4.1 m) |
| Installed power |
|
| Propulsion |
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| Speed |
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| Range | 2,400 nmi (4,400 km; 2,800 mi) at 12.5 kn (23.2 km/h; 14.4 mph) surfaced |
| Complement | 22 |
| Armament |
|
HMS G7 was a British G-class submarine built for the Royal Navy during World War I.
Description
The G-class submarines were designed by the Admiralty in response to a rumour that the Germans were building double-hulled submarines for overseas duties. The submarines had a length of 187 feet 1 inch (57.0 m) overall, a beam of 22 feet 8 inches (6.9 m) and a mean draft of 13 feet 4 inches (4.1 m). They displaced 703 long tons (714 t) on the surface and 837 long tons (850 t) submerged. The G-class submarines had a crew of 30 officers and other ranks. They had a partial double hull.[1]
For surface running, the boats were powered by two 800-brake-horsepower (597 kW) Vickers two-stroke diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 420-horsepower (313 kW) electric motor. They could reach 14.25 knots (26.39 km/h; 16.40 mph) on the surface and 9 knots (17 km/h; 10 mph) underwater. On the surface, the G class had a range of 2,400 nautical miles (4,400 km; 2,800 mi) at 16 knots (30 km/h; 18 mph).[1]
The boats were intended to be armed with one 21-inch (53.3 cm) torpedo tube in the bow and two 18-inch (45 cm) torpedo tubes on the beam. This was revised, however, while they were under construction, the 21-inch tube was moved to the stern and two additional 18-inch tubes were added in the bow. They carried two 21-inch and eight 18-inch torpedoes. The G-class submarines were also armed with a single 3-inch (7.6 cm) deck gun.[1]
Career
Like the rest of her class, G7's role was to patrol an area of the North Sea in search of German U-boats. On 15 April 1917, G7 was patrolling between Lerwick and Bergen when she sighted the German submarine U-30. G7 fired a torpedo at U-30 and after an exchange of gunfire the German submarine dived away. Although U-30 escaped unscathed, G7 had interrupted U30's attempts to sink two Norwegian merchant ships. One, Svanfos, which still had a boarding party from U-30 aboard, returned to Bergen under her own steam, while the second, the Borgila, had been abandoned by her crew. G7 put a salvage party aboard Borgila until the Norwegian destroyer Draug arrived to take over.[2]
In October 1918 G7 was on patrol in the North Sea. Communications were lost on 23 October and she was declared lost on 1 November.
Notes
References
- Colledge, J. J.; Warlow, Ben (2006) [1969]. Ships of the Royal Navy: The Complete Record of all Fighting Ships of the Royal Navy (Rev. ed.). London: Chatham Publishing. ISBN 978-1-86176-281-8.
- Gardiner, Robert & Gray, Randal, eds. (1985). Conway's All the World's Fighting Ships: 1906–1921. Annapolis, Maryland: Naval Institute Press. ISBN 0-85177-245-5.
- McCartney, Innes (2008). British Submarines of World War I. New Vanguard. Vol. 145. Oxford, UK: Osprey. ISBN 978-1-84603-334-6.
- Monograph No. 34: Home Waters—Part VIII.: From February to July 1915 (PDF). Naval Staff Monographs (Historical). Vol. XVIII. The Naval Staff, Training and Staff Duties Division. 1933.
Shipwrecks and maritime incidents in October 1918 | |
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| Shipwrecks |
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| Other incidents |
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