HMS G7
{{short description|Submarine of the Royal Navy}}
{{Use dmy dates|date=February 2018}}
{{Use British English|date=February 2018}}
| {{Infobox ship begin}}
{{Infobox ship image |Ship image=G9 at Scapa.jpg |Ship caption= A G-class submarine before bow modification. }} {{Infobox ship career |Hide header= |Ship country=United Kingdom |Ship flag={{shipboxflag|United Kingdom|naval}} |Ship name=G7 |Ship ordered= |Ship awarded= |Ship builder=Armstrong Whitworth |Ship original cost= |Ship yard number= |Ship way number= |Ship laid down= |Ship launched=4 March 1916 |Ship sponsor= |Ship christened= |Ship completed= |Ship acquired= |Ship commissioned=21 August 1916 |Ship recommissioned= |Ship decommissioned= |Ship maiden voyage= |Ship in service= |Ship out of service= |Ship renamed= |Ship reclassified= |Ship refit= |Ship struck= |Ship reinstated= |Ship homeport= |Ship identification= |Ship motto= |Ship nickname= |Ship honours= |Ship fate=Missing October 1918 in the North Sea. Presumed sunk. |Ship notes= |Ship badge= }} {{Infobox ship characteristics |Hide header= |Header caption= | Ship class = G-class submarine | Ship displacement =*{{convert|703|LT|t|0|abbr=on}} surfaced
| Ship length = {{convert|187|ft|1|in|m|abbr=on|1}} | Ship beam = {{convert|22|ft|8|in|m|abbr=on|1}} | Ship draught = {{convert|13|ft|4|in|m|abbr=on|1}} |Ship power=*{{convert|1600|bhp|lk=in|abbr=on}} (diesel)
|Ship propulsion=
| Ship speed =*{{convert|14.25|kn|lk=in}} surfaced
| Ship range = {{convert|2400|nmi|lk=in|abbr=on}} at {{convert|12.5|kn|abbr=on}} surfaced | Ship test depth = | Ship complement = 30 | Ship armament =*4 × 18-inch (45 cm) torpedo tubes
| Ship notes = }} |
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 {{convert|187|ft|1|in|m|1}} overall, a beam of {{convert|22|ft|8|in|m|1}} and a mean draft of {{convert|13|ft|4|in|m|1}}. They displaced {{convert|703|LT|t}} on the surface and {{convert|837|LT|t}} submerged. The G-class submarines had a crew of 30 officers and ratings. They had a partial double hull.Gardiner & Gray, p. 90
For surface running, the boats were powered by two {{convert|800|bhp|lk=in|0|adj=on}} Vickers two-stroke diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a {{convert|420|hp|0|adj=on}} electric motor. They could reach {{convert|14.25|kn|lk=in}} on the surface and {{convert|9|kn}} underwater. On the surface, the G class had a range of {{convert|2400|nmi|lk=in}} at {{convert|16|kn}}.
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 {{convert|3|in|cm|1|adj=on}} deck gun.
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 {{ship|SM|U-30|Germany|2}}. 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, {{Ship|SS|Svanfos|1905|2}}, 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 {{Ship|HNoMS|Draug|1908|2}} arrived to take over.Monograph No. 34, p. 460.
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
{{Reflist|30em}}
References
- {{Cite Colledge2006}}
- {{cite book |editor1-last=Gardiner|editor1-first=Robert|editor2-last=Gray|editor2-first=Randal|title=Conway's All the World's Fighting Ships 1906–1921|year=1985|location=Annapolis, Maryland|publisher=Naval Institute Press|isbn=0-85177-245-5|name-list-style=amp}}
- {{cite book|last=McCartney|first=Innes|title=British Submarines of World War I|series=New Vanguard|volume=145|year=2008|publisher=Osprey|location=Oxford, UK|isbn=978-1-84603-334-6}}
- {{cite book|title=Monograph No. 34: Home Waters—Part VIII.: From February to July 1915|series=Naval Staff Monographs (Historical)|volume=XVIII|year=1933|publisher=The Naval Staff, Training and Staff Duties Division|url=http://www.navy.gov.au/sites/default/files/documents/Naval-Staff-Monographs-Vol.XVIII_opt.pdf|ref={{Harvid|Naval Staff Monograph No. 34|1933}} }}
{{British G class submarine}}
{{October 1918 shipwrecks}}
{{coord missing|North Sea}}
{{DEFAULTSORT:G07}}
Category:British G-class submarines
Category:World War I submarines of the United Kingdom
Category:Ships built on the River Tyne
Category:Royal Navy ship names
Category:Maritime incidents in 1918