HMS D7
Submarine of the Royal Navy
title: "HMS D7" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["british-d-class-submarines", "1911-ships", "royal-navy-ship-names"] description: "Submarine of the Royal Navy" topic_path: "geography/united-kingdom" source: "https://en.wikipedia.org/wiki/HMS_D7" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Submarine of the Royal Navy ::
::data[format=table title="Infobox ship"]
| Field | Value |
|---|---|
| section1 | {{Infobox ship/image |
| image | ONE OF BRITAIN'S DEADLY MOSQUITOES OF THE OCEAN (HMS D7 submarine).png |
| section2 | {{Infobox ship/career |
| country | United Kingdom |
| flag | |
| name | HMS D7 |
| builder | Chatham Dockyard |
| laid_down | 14 February 1910 |
| launched | 14 January 1911 |
| commissioned | 14 December 1911 |
| fate | Sold 19 December 1921 to H. Pounds |
| section3 | {{Infobox ship/characteristics |
| class | D-class submarine |
| displacement | Surfaced= 483 tons / Submerged= 595 tons |
| length | 163.0 ft (oa) |
| beam | 13.6 ft (oa) |
| propulsion | 550 hp electric 1750 hp diesel twin screws |
| speed | *Surfaced=*14.0 kn |
| *Submerged | 10.0 kn (design) 9.0 kn (service) |
| range | *Surface=*2500 nmi at 10 kn |
| *Submerged | 45 nmi at 5 kn |
| complement | 25 |
| armament | 3 x 18 in torpedo tubes (2 forward, one aft) |
| :: |
|section1={{Infobox ship/image |image=ONE OF BRITAIN'S DEADLY MOSQUITOES OF THE OCEAN (HMS D7 submarine).png |image_caption=
|section2={{Infobox ship/career |hide_header= |country=United Kingdom |flag= |name=HMS D7 |ordered= |awarded= |builder= Chatham Dockyard |laid_down= 14 February 1910 |launched= 14 January 1911 |christened= |acquired= |commissioned= 14 December 1911 |recommissioned= |decommissioned= |in_service= |out_of_service= |renamed= |reclassified= |refit= |struck= |reinstated= |fate=Sold 19 December 1921 to H. Pounds |homeport=
|section3={{Infobox ship/characteristics |hide_header= |header_caption= |class=D-class submarine |displacement=Surfaced= 483 tons / Submerged= 595 tons |length=163.0 ft (oa) |beam=13.6 ft (oa) |draught= |propulsion=550 hp electric 1750 hp diesel twin screws |speed=*Surfaced=*14.0 kn
- Submerged= 10.0 kn (design) 9.0 kn (service) |range=*Surface=*2500 nmi at 10 kn
- Submerged=45 nmi at 5 kn |endurance= |test_depth= |complement=25 |sensors= |EW= |armament= 3 x 18 in torpedo tubes (2 forward, one aft) |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 164 ft overall, a beam of 20 ft and a mean draught of 11 ft. They displaced 495 LT on the surface and 620 LT submerged. The D-class submarines had a crew of 25 officers and ratings and were the first to adopt saddle tanks.
For surface running, the boats were powered by two 600 bhp diesels, each driving one propeller shaft. When submerged each propeller was driven by a 275 hp electric motor. They could reach 14 kn on the surface and 9 kn underwater. On the surface, the D class had a range of 2500 nmi at 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 on the surface with a single shot from 800 yd 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 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
References
References
- Harrison, Chapter 4
- Gardiner & Gray, p. 87
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