X4

Built By:	Portsmouth Dockyard
Build Group:	XP
Fate:	Scrapped in 1945

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Unofficially named Exciter

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Official

XP Specification

Length overall	43' 6"
Beam	8' (with charges) / 5' 6" (without charges)
Displacement	Witht Charges: 30 tons (surface) / 32 1/2 tons (submerged)
	With Charges: 32 1/2 tons (submerged)
	Without Charges: 27 tons (surface)
	Without Charges: 29 1/2 tons (submerged)
Diving Depth	200'
Speed	With Charges: 6.5 knots (surface)
	5 knots (submerged)
No. of shafts	1
Armament	2 2-ton side charges
	Limpet mines
Endurance	Surface: 1100 miles at 4.5 knots (with charges)
	Surface: 1400 miles at 4.5 knots (without charges)
	Submerged: 85 miles at 2 knots (with charges)
	Submerged: 85 miles at 2 knots (without charges)
Complement	3

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Frederick William Simpson, DSM

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Frederick William Simpson was born in Hull, Yorkshire on 7th October 1904. His father was a hairdresser by trade but, during the Great War served in France with the RASC. It was whilst his father was on the Western Front that his mother died of TB. Bill Simpson, as he was known to his friends, was brought up by an aunt. He sold newspapers and firewood to make a little money and help buy his clothes.