History
United Kingdom
Name	HMS M4
Builder	Armstrong Whitworth
Laid down	1917
Launched	2 July 1919
Fate	Sold as an incomplete hulk, 30 November 1921
General characteristics (as designed)
Class & type	M-class submarine
Displacement	1,594 long tons (1,620 t) surfaced 1,946 long tons (1,977 t) submerged
Length	305 ft 9 in (93.19 m)
Beam	24 ft 8 in (7.52 m)
Propulsion	2 × 12-cylinder Vickers 1,200 hp (890 kW) diesel engines 4 × 800 hp (600 kW) electric motors 2 × 3-blade 5 ft 10 in (1.78 m) diameter propellers
Speed	15 knots (28 km/h) surfaced 8–9 kn (15–17 km/h) submerged
Range	Surfaced: 2,000 nmi (3,700 km) at 15 kn (28 km/h) 4,500 nmi (8,300 km) at 10 kn (19 km/h) Submerged: 9 nmi (17 km) at 17 kn (31 km/h) 80 nmi (150 km) at 2 kn (3.7 km/h)
Test depth	200 ft (61 m)
Complement	62
Armament	1 × 12-inch (305mm)/40 cal Mark IX gun with 50 rounds 1 × 3 in (76 mm) Mk II HA anti-aircraft gun 4 × 21 inch (533 mm) bow torpedo tubes with 4 reload torpedoes

HMS M4 was an M-class submarine of the Royal Navy built by Armstrong Whitworth, Newcastle Upon Tyne, and laid down in 1917. M4 was cancelled and sold as an incomplete hulk on 30 November 1921.

References

• Hutchinson, Robert (2001). Jane's Submarines: War Beneath the Waves from 1776 to the Present Day . London: HarperCollins. ISBN   978-0-00-710558-8. OCLC   53783010.
• Colledge, J. J.; Warlow, Ben (2006) [1969]. Ships of the Royal Navy: The Complete Record of All Fighting Ships of the Royal Navy from the 15th Century to the Present (Rev. ed.). London: Chatham Publishing. ISBN   978-1-86176-281-8. OCLC   67375475.

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