Troude-class cruiser

The Troude class was a class of protected cruisers of the French Navy. The class comprised Troude, Cosmao and Lalande.

Troude early in her career
Class overview
Name: Troude class
Builders: Forges et Chantiers de la Gironde
Operators:  French Navy
Preceded by: Forbin class
Succeeded by: Alger class
Built: 1886–1891
In commission: 1891–1922
Completed: 3
Retired: 3
General characteristics
Class and type: Protected cruiser
Displacement: 1,923 to 1,994 long tons (1,954 to 2,026 t)
Length: 95 m (311 ft 8 in) lwl
Beam: 9 m (29 ft 6 in)
Draft: 5.18 m (17 ft)
Installed power:
Propulsion:
Speed: 20.5 knots (38.0 km/h; 23.6 mph)
Complement: 201
Armament:
Armor:

Design

By the late 1870s, the unprotected cruisers and avisos the French Navy had built as fleet scouts were becoming obsolescent, particularly a result of their low speed of 12 to 14 knots (22 to 26 km/h; 14 to 16 mph), which rendered them too slow to be effective scouts. Beginning in 1879, the Conseil des Travaux (Council of Works) had requested designs for small but fast cruisers of about 2,000 long tons (2,032 t) displacement that could be used as scouts for the main battle fleet or to lead squadrons of torpedo boats. The naval engineer Louis-Émile Bertin had advocated for just such a vessel since 1875, and his design became the cruiser Milan. Bertin's design was developed into the Troude-type of protected cruisers after the Conseil requested light armor protection for the ships.[1][2]

By 1886, Admiral Théophile Aube had become the French Minister of Marine. Aube was an ardent supporter of the Jeune École doctrine, which envisioned using a combination of cruisers and torpedo boats to defend France and attack enemy merchant shipping. By the time Aube had come to office, the French Navy had laid down three large protected cruisers that were intended to serve as commerce raiders: Sfax, Tage, and Amiral Cécille. His proposed budget called for another six large cruisers and ten smaller vessels, but by the time it was approved later in 1886, it had been modified to three large cruisers of the Alger class, along with the two medium cruisers Davout and Suchet, and six small cruisers, which became the Troude and Forbin classes, each with three members.[3][4]

Characteristics

The ships of the Troude class were 95 m (311 ft 8 in) long at the waterline, with a beam of 9 m (29 ft 6 in) and a draft of 5.18 m (17 ft). They displaced 1,923 to 1,968 long tons (1,954 to 2,000 t). Their hulls had a pronounced ram bow and tumblehome shape that characterized most French warships of the period. They had a minimal superstructure that consisted primarily of a small conning tower with a bridge. Their crew amounted to 201 officers and enlisted men.[5]

The ships' propulsion systems were manufactured by Schneider-Creusot and consisted of a pair of horizontal compound steam engines driving two 3-bladed, bronze screw propellers. Steam was provided by five coal-burning fire-tube boilers that were ducted into two funnels. The forward funnel was thin and the aft wider, though both were raked backward slightly. Their machinery was rated to produce 5,800 indicated horsepower (4,300 kW) for a top speed of 20.5 knots (38.0 km/h; 23.6 mph). The ships vibrated excessively at speeds in excess of 20 knots, however, and the hull and engines were reportedly unable to withstand prolonged steaming at top speed as a result. This was a result of the lightly-built hull and insufficiently strong scantlings, and was common to ships of the type. Coal storage amounted to 300 long tons (300 t). When steaming at a speed of 17 knots (31 km/h; 20 mph), the ships had a cruising range of 1,621 nautical miles (3,002 km; 1,865 mi).[5][6]

The ships were armed with a main battery of four 138 mm (5.4 in) 30-caliber guns in individual pivot mounts, all in sponsons located amidships with two guns per broadside. For close-range defense against torpedo boats, they carried four 47 mm (1.9 in) 3-pounder Hotchkiss guns and four 37 mm (1.5 in) 1-pounder Hotchkiss revolver cannon. They were also armed with four 356 mm (14 in) torpedo tubes in their hull below the waterline, and they had provisions to carry up to 150 naval mines. Armor protection consisted of a curved armor deck that was 41 mm (1.6 in) thick, along with 25 mm (1 in) plating on the conning tower, though Cosmao lacked armor on her conning tower.[5]

Construction
Name Shipyard[5] Laid down[5] Launched[7] Completed[5]
Troude Forges et Chantiers de la Gironde November 1886 22 October 1888 January 1891
Lalande 1887 21 March 1889 October 1890
Cosmao 1887 August 1889 1891

Service history
Lalande in the early 1890s

Notes
  1. Ropp, pp. 129–130.
  2. Gardiner, p. 320.
  3. Gardiner, pp. 308–310.
  4. Ropp, pp. 158–159, 172.
  5. Gardiner, p. 310.
  6. Ships: France, pp. 271–272.
  7. Gardiner & Gray, p. 193.

References
  • Friedman, Norman (2011). Naval Weapons of World War One: Guns, Torpedoes, Mines and ASW Weapons of All Nations; An Illustrated Directory. Annapolis: Naval Institute Press. ISBN 978-1-84832-100-7.
  • Gardiner, Robert, ed. (1979). Conway's All the World's Fighting Ships 1860–1905. London: Conway Maritime Press. ISBN 978-0-85177-133-5.
  • Gardiner, Robert & Gray, Randal, eds. (1985). Conway's All the World's Fighting Ships: 1906–1921. Annapolis: Naval Institute Press. ISBN 978-0-87021-907-8.
  • Ropp, Theodore (1987). Roberts, Stephen S. (ed.). The Development of a Modern Navy: French Naval Policy, 1871–1904. Annapolis: Naval Institute Press. ISBN 978-0-87021-141-6.
  • "Ships: France". Journal of the American Society of Naval Engineers. III (1): 269–281. 1891. OCLC 1153223376.
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