HMS G7

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:	703 long tons (714 t) surfaced 837 long tons (850 t) submerged
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:	1,600 bhp (1,200 kW) (diesel) 840 hp (630 kW) (electric motor)
Propulsion:	2 × diesel engines 2 × electric motors
Speed:	14.25 knots (26.39 km/h; 16.40 mph) surfaced 9 knots (17 km/h; 10 mph) submerged
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:	4 × 18-inch (45 cm) torpedo tubes 1 × 21-inch (53.3 cm) torpedo tube

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. OCLC 67375475. 
• Gardiner, Robert & Gray, Randal, eds. (1984). 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. 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). XVIII. The Naval Staff, Training and Staff Duties Division. 1933.