HMS G4

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.

After commissioning, G4 was sent to join 11th Submarine Flotilla at Blyth.

On 19 June 1916, G4 was patrolling in the Kattegat when she encountered the German merchant ship SS Ems, carrying a load of oil, zinc and copper plates from Oslo to Lübeck, and stopped her with a warning shot. Once the German ship's crew had abandoned ship, G4 fired two torpedo at Ems, both of which missed, and then sank the merchant ship with gunfire. A second German merchantman escaped to neutral Swedish waters. Sweden protested about the sinking of Ems, claiming that it took place within Swedish territorial waters, but Britain denied this. The dispute between Sweden and Britain about the sinking of Ems was still ongoing at the end of the war.{{Harvnb|Naval Staff Monograph No. 33|1927|pp=51–52}} At some point between 20 August 1916 and 3 October 1916, she went to Scapa Flow and left there to go to Murmansk (then called Romanov), arriving on 20 October 1916. She left there on 15 November, arriving in Kirkwall five days later. G4 then spent the rest of the First World War conducting patrols in the North Sea from Blyth, and was there at the time of the armistice.

{{Reflist|30em}}

• {{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. 33: Home Waters—Part VII: From June 1916 to November 1916|series=Naval Staff Monographs (Historical)|volume=XVII|year=1927|publisher=The Naval Staff, Training and Staff Duties Division|url=http://www.navy.gov.au/sites/default/files/documents/Naval-Staff-Monographs-Vol.XVII_opt.pdf|ref={{Harvid|Naval Staff Monograph No. 33|1927}} }}

{{British G class submarine}}

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Category:British G-class submarines

Category:World War I submarines of the United Kingdom

Category:Ships built in Chatham

Category:Royal Navy ship names

Category:1915 ships