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D 7 (I 77)

Built By: Chatham Dockyard (Medway)
Build Group: D
Fate: Scrapped 19th December 1921.

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1914: 8th Flotilla Portsmouth, HMS Maidstone and Adamant
1914: 8th Flotilla. HMS Maidstone, Harwich.

Had an encounter with a submerged German U-boat in May of 1918 which resulted with her periscopes being damaged.

Events

 14-02-1910   Laid Down
 14-01-1911   Launched
 14-12-1911   Completed
 10-02-1918   D7 had a frightening experience when she was depth-charged by the destroyer HMS Pelican in a case of mistaken identity.

Considerable damage was caused during the attack.

Eventually the boat was able to surface and identify herself
D Specification
Length overall  164 ft
Beam  13 ft 10 7/8 inch
Depth  13 ft 11 1/8 inch
Displacement   Surface 495 tons
  Submerged 620 tons
Diving Depth  100 ft
Speed  Surface 14.5 knots (design)
  Surface 14.5 knots (service)
  Submerged 9 knots (design)
  Submerged 9+ knots (service)
No. of shafts  2
Propeller  3 blades, 5 ft diameter
Armament  2 x 18 inch bow tubes
  1 x 18 inch stern tube
  (6 torpedoes carried)
Endurance  Surface: 2500 miles at 10 knots (design)
  Surface: 2500 miles at 11.5 knots (service)
  Submerged: 70 miles at 5 knots (design)
Complement  3 officers and 22 ratings
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