D4

Built By:	Vickers (Barrow)
Build Group:	D
Fate:	Scrapped in December 1921.

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First British submarine to be fitted with a gun

Events

24-02-1910 :	Laid Down
25-05-1911 :	Launched
29-11-1911 :	Completed
22-06-1915 :	D4 sank the German minelayer Bielefeld
12-05-1918 :	Sank UB-72

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Length overall	164' 7"
Beam	13' 10 7/8"
Depth	13' 11 1/8"
Displacement	Surface 495 tons
	Submerged 620 tons
Diving Depth	100'
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' 3" diameter
Armament	2 18" bow tubes
	1 18" 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	25

RN Subs

D4

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D Specification

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The Royal Navy's all nuclear-powered submarine force arrived just a few years after it accepted for service four modern diesel-electric submarines of the UPHOLDER (S40) class (designated SSK for hunter killer). The decision to retire these excellent boats was made for financial reasons following the Cold War. This note reviews the Upholders and their retirement from the fleet.