H.M.S. D4
1911
(Navis 171)
- Class: D class - 8 submarines of 1906-10
- Displacement: 495 tons surfaced; 620 tons submerged
- Dimensions: 164ft 7in x 20ft 5in x 11ft 5in
- Machinery: 2-shaft 6-cyl diesels, 2 electric motors, 1200hp/550hp = 14/9 kts
- Armament: 3-18in TT (2 bow, 1 stern)
- Complement: 25
- Builder: Vickers
- Laid Down: 1910
- Launched: 27 May 1911
- Completed: 1911
- Notes: First class of British submarines with an overseas patrolling ability. D4 sank the German submarine UB72 in Lyme Bay 12 May 1918. Postwar sold for breakup 1921
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