HMS C7

	HMS C38 - a typical C-class submarine
History
United Kingdom
Name	HMS C7
Builder	Vickers, Barrow
Laid down	9 December 1905
Launched	15 February 1907
Commissioned	23 May 1907
Fate	Sold for scrapping, 20 December 1919
General characteristics
Class and type	C-class submarine
Displacement	287 long tons (292 t) surfaced; 316 long tons (321 t) submerged;
Length	142 ft 3 in (43.4 m)
Beam	13 ft 7 in (4.1 m)
Draught	11 ft 6 in (3.5 m)
Installed power	600 bhp (450 kW) petrol ; 300 hp (220 kW) electric;
Propulsion	1 × 16-cylinder Vickers petrol engine; 1 × electric motor ;
Speed	12 kn (22 km/h; 14 mph) surfaced; 7 kn (13 km/h; 8.1 mph) submerged;
Range	910 nmi (1,690 km; 1,050 mi) at 12 kn (22 km/h; 14 mph) on the surface
Test depth	100 feet (30.5 m)
Complement	2 officers and 14 ratings
Armament	2 × 18 in (450 mm) bow torpedo tubes

Last updated January 13, 2024

HMS C7 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1920.

Design and description

The C class was essentially a repeat of the preceding B class, albeit with better performance underwater. The submarine had a length of 142 feet 3 inches (43.4 m) overall, a beam of 13 feet 7 inches (4.1 m) and a mean draft of 11 feet 6 inches (3.5 m). They displaced 287 long tons (292 t) on the surface and 316 long tons (321 t) submerged. The C-class submarines had a crew of two officers and fourteen ratings.^[1]

For surface running, the boats were powered by a single 16-cylinder 600- brake-horsepower (447 kW) Vickers petrol engine that drove one propeller shaft. When submerged the propeller was driven by a 300-horsepower (224 kW) electric motor.^[1] They could reach 12 knots (22 km/h; 14 mph) on the surface and 7 knots (13 km/h; 8.1 mph) underwater. On the surface, the C class had a range of 910 nautical miles (1,690 km; 1,050 mi) at 12 knots (22 km/h; 14 mph).^[2]

The boats were armed with two 18-inch (45 cm) torpedo tubes in the bow. They could carry a pair of reload torpedoes, but generally did not as they would have to remove an equal weight of fuel in compensation.^[3]

Construction and career

C7 was built by Vickers at their Barrow-in-Furness shipyard, laid down on 9 December 1905 and was commissioned on 23 May 1907. The boat is often mistakenly credited with sinking UC-68 on 5 April 1917 off the coast of The Netherlands. However, this attack was made against UB-10, which survived.^[4]C7 was sold on 20 December 1919.

Notes

1 2 Gardiner & Gray, p. 87
↑ Harrison, Chapter 3
↑ Harrison, Chapter 27
↑ McCartney, Innes (2002). Lost Patrols: Submarine Wrecks of the English Channel. Periscope Publishing Ltd. p. 60. ISBN 1904381049

Related Research Articles

HMS C1 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1920.

HMS C2 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1920.

HMS C3 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat was used to demolish a viaduct during the Zeebrugge Raid in 1918.

HMS C4 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1922.

HMS C5 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1919.

HMS C6 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1919.

HMS C9 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1922.

HMS C12 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1920.

HMS C13 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1920.

HMS C14 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1920.

HMS C15 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1922.

HMS C17 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1919.

HMS C18 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1921.

HMS C22 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1920.

HMS C26 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century.

HMS C38 was one of 38 C-class submarines built for the United Kingdom Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1919.

HMS C31 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. She struck a mine in 1915 and sank with the loss of all hands.

HMS C30 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century. The boat survived the First World War and was sold for scrap in 1921.

HMS C35 was one of 38 C-class submarines built for the Royal Navy in the first decade of the 20th century.

HMS L14 was a L-class submarine built for the Royal Navy during World War I. She was one of five boats in the class to be fitted as a minelayer. The boat survived the war and was sold for scrap in 1934.

References

Akermann, Paul (2002). Encyclopaedia of British Submarines 1901–1955 (reprint of the 1989 ed.). Penzance, Cornwall: Periscope Publishing. ISBN 1-904381-05-7.
Colledge, J. J.; Warlow, Ben (2006) [1969]. Ships of the Royal Navy: The Complete Record of all Fighting Ships of the Royal Navy (Rev. ed.). London: Chatham Publishing. ISBN 978-1-86176-281-8.
Gardiner, Robert & Gray, Randal, eds. (1985). Conway's All the World's Fighting Ships 1906–1921. Annapolis, Maryland: Naval Institute Press. ISBN 0-85177-245-5.
Harrison, A. N. (January 1979). "The Development of HM Submarines From Holland No. 1 (1901) to Porpoise (1930) (BR3043)". RN Subs. Retrieved 27 September 2022.

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[gg9-1] 1 2 Gardiner & Gray, p. 87

[2] Harrison, Chapter 3

[3] Harrison, Chapter 27

[4] McCartney, Innes (2002). Lost Patrols: Submarine Wrecks of the English Channel. Periscope Publishing Ltd. p. 60. ISBN 1904381049

[1]

[2]

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[4]

v t e British C-class submarines
C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38
Preceded by: B class Followed by: D class
List of submarines of the Royal Navy List of submarine classes of the Royal Navy

History
HMS C38 - a typical C-class submarine
United Kingdom
Name	HMS C7
Builder	Vickers, Barrow
Laid down	9 December 1905
Launched	15 February 1907
Commissioned	23 May 1907
Fate	Sold for scrapping, 20 December 1919
General characteristics
Class and type	C-class submarine
Displacement	287 long tons (292 t) surfaced 316 long tons (321 t) submerged
Length	142 ft 3 in (43.4 m)
Beam	13 ft 7 in (4.1 m)
Draught	11 ft 6 in (3.5 m)
Installed power	600 bhp (450 kW) petrol 300 hp (220 kW) electric
Propulsion	1 × 16-cylinder Vickers petrol engine 1 × electric motor
Speed	12 kn (22 km/h; 14 mph) surfaced 7 kn (13 km/h; 8.1 mph) submerged
Range	910 nmi (1,690 km; 1,050 mi) at 12 kn (22 km/h; 14 mph) on the surface
Test depth	100 feet (30.5 m)
Complement	2 officers and 14 ratings
Armament	2 × 18 in (450 mm) bow torpedo tubes