|Builder:||Vickers Armstrong, Barrow-in-Furness|
|Laid down:||14 May 1907|
|Launched:||16 May 1908|
|Fate:||Sunk (as a target) on 23 October 1918|
|Class & type:||D class submarine|
|Displacement:||Surfaced= 483 tons / Submerged= 595 tons|
|Length:||163.0 ft (49.7 m) (oa)|
|Beam:||13.6 ft (4.1 m) (oa)|
|Propulsion:||550hp electric 1750hp diesel twin screws|
|Speed:||Surfaced=14.0 kts / Dived= 10.0 (design) 9.0 (service)|
|Range:||Surface= 2500nm at 10 kts / Submerged=45nm at 5knots|
|Armament:||3x18 in (46 cm) torpedo tubes (2 forward, one aft, 6 torpedoes) / 1x12 pdr (76 mm) QF gun|
In 1910, D1 took part in the Annual Manoevures. She torpedoed 2 blue fleet cruisers off Colonsay. This showed that the D class could operate a considerable away from their base at Fort Blockhouse.
D1 was sunk as a target on 23 October 1918.
- Fitzsimons, Bernard. Illustrated Encyclopedia of 20th Century Weapons and Warfare (London: Phoebus, 1978), Volume 7, p.674, "D.1".
- Fitzsimons, p.674.
- Submarines, war beneath the waves, from 1776 to the present day, by Robert Hutchinson
- The Royal Navy Submarine Service, A Centennial History, by Antony Preston
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