HMS D7
{{short description|Submarine of the Royal Navy}}
{{Use dmy dates|date=August 2017}}
{{Use British English|date=August 2017}}
| {{Infobox ship begin}}
{{Infobox ship image |Ship image=ONE OF BRITAIN'S DEADLY MOSQUITOES OF THE OCEAN (HMS D7 submarine).png |Ship caption= }} {{Infobox ship career |Hide header= |Ship country=United Kingdom |Ship flag={{shipboxflag|United Kingdom|naval}} |Ship name=HMS D7 |Ship ordered= |Ship awarded= |Ship builder= Chatham Dockyard |Ship laid down= 14 February 1910 |Ship launched= 14 January 1911 |Ship christened= |Ship acquired= |Ship commissioned= 14 December 1911 |Ship recommissioned= |Ship decommissioned= |Ship in service= |Ship out of service= |Ship renamed= |Ship reclassified= |Ship refit= |Ship struck= |Ship reinstated= |Ship fate=Sold 19 December 1921 to H. Pounds |Ship homeport= }} {{Infobox ship characteristics |Hide header= |Header caption= |Ship displacement=Surfaced= 483 tons / Submerged= 595 tons |Ship length={{convert|163.0|ft|m|abbr=on}} (oa) |Ship beam={{convert|13.6|ft|m|abbr=on}} (oa) |Ship draught= |Ship propulsion={{convert|550|hp|kW|abbr=on}} electric {{convert|1750|hp|kW|abbr=on}} diesel twin screws |Ship speed=*Surfaced=*{{convert|14.0|kn}}
|Ship range=*Surface=*{{convert|2500|nmi}} at {{convert|10|kn}}
|Ship endurance= |Ship test depth= |Ship complement=25 |Ship sensors= |Ship EW= |Ship armament= 3 x {{convert|18|in|cm|adj=on|0}} torpedo tubes (2 forward, one aft) |Ship notes= }} |
HMS D7 was one of eight D-class submarines built for the Royal Navy during the first decade of the 20th century.
Description
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 {{convert|164|ft|7|in|m|1}} overall, a beam of {{convert|20|ft|5|in|m|1}} and a mean draught of {{convert|11|ft|5|in|m|1}}. They displaced {{convert|495|LT|t}} on the surface and {{convert|620|LT|t}} submerged.Harrison, Chapter 4 The D-class submarines had a crew of 25 officers and ratings and were the first to adopt saddle tanks.Gardiner & Gray, p. 87
For surface running, the boats were powered by two {{convert|600|bhp|lk=in|0|adj=on}} diesels, each driving one propeller shaft. When submerged each propeller was driven by a {{convert|275|hp|0|adj=on}} electric motor. They could reach {{convert|14|kn|lk=in}} on the surface and {{convert|9|kn}} underwater. On the surface, the D class had a range of {{convert|2500|nmi|lk=in}} at {{convert|10|kn}}.
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.
Construction and career
D7 was laid down on 14 February 1910 by Chatham Dockyard, launched 14 January 1911 and was commissioned on 14 December 1911. D7 torpedoed the German submarine {{ship|SM|U-45||2}} on the surface with a single shot from {{convert|800|yd|m}} off the North coast of Ireland on 12 September 1917. The torpedo was launched from the stern torpedo tube. Then on 10 February 1918, D7 was mistakenly depth charged by the destroyer {{HMS|Pelican|1916|6}} but she survived. D7 collided with a U-boat in May 1918. Her periscopes were damaged but she escaped otherwise unscathed. D7 was sold on 19 December 1921 to H. Pounds.
Notes
{{Reflist|30em}}
References
- {{cite book|last=Akermann|first=Paul|title=Encyclopaedia of British Submarines 1901–1955|edition=reprint of the 1989|year=2002|publisher=Periscope Publishing|location=Penzance, Cornwall|isbn=1-904381-05-7}}
- {{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 web|url=http://rnsubs.co.uk/dits-bits/br-3043.html|title=The Development of HM Submarines From Holland No. 1 (1901) to Porpoise (1930) (BR3043)|last=Harrison|first=A. N.|date=January 1979|publisher=RN Subs|access-date=27 September 2022}}
{{British D class submarine}}
{{DEFAULTSORT:D07}}