Jemmapes-class ironclad

Last updated

Le Jemmapes - French cost guard ironclad (1895).jpg
Jemmapes
Class overview
NameJemmapes class
OperatorsCivil and Naval Ensign of France.svg  French Navy
Preceded by Furieux
Succeeded by Bouvines class
Built1889–1894
In service1895–1910
Completed2
Retired2
General characteristics
Type Coastal-defense ship
Displacement6,579  t (6,475 long tons) (deep load)
Length89.6 m (294 ft 0 in) (o/a)
Beam17.48 m (57 ft 4 in)
Draft6.71 m (22.0 ft)
Installed power
Propulsion2 shafts, 2 triple-expansion steam engines
Speed15  kn (28 km/h; 17 mph)
Range2,667  nmi (4,939 km; 3,069 mi) at 11 kn (20 km/h; 13 mph)
Complement299
Armament
Armor

The Jemmapes class was a group of two coastal-defense ships built for the French Navy in the early 1890s. The class comprised Jemmapes and Valmy and were an improved version of the preceding Furieux, built for a higher speed with more modern Belleville boilers. They were armed with two turret-mounted 340 mm (13.4 in) guns and were protected by armor up to 460 mm (18 in) thick. Launched in 1892, the ships served with the Northern Squadron (Esadre du Nord) of the French Navy. They operated along with the similar Amiral Tréhouart and Bouvines as the Coastal Defence Division, being considered together "the most homogenous and dangerous squadron that one could meet at sea" by Vice Admiral Armand Bernard. They were struck in 1910 and, although Jemmapes had a brief respite as a hulk, they were both subsequently sold to be broken up.

Contents

Design and development

Plan view of the Jemmapes class Jemmapes class - Brassey's Naval Annual 1894.png
Plan view of the Jemmapes class

In the early 1880s, the Jeune École doctrine became popular in French naval circles. Key to this was the replacement of the battleship broadside with smaller vessels armed with torpedoes, such as smaller cruisers and torpedo boats, to defend France and attack enemy merchant shipping. [1] To support these smaller vessels, a lesser number of powerful coastal defense ships were planned. [2]

On 15 November 1888, the naval architect Louis de Bussy sent a note to the Ministry of the Navy (Ministère de la Marine) Jules François Émile Krantz on the newly-completed coastal defense ship Furieux. Krantz responded immediately with a request for a ship derived from Furieux but with more modern Belleville boilers to give a higher speed of 16  kn (30 km/h; 18 mph). De Bussy submitted his design on 14 February 1889. The design proposal was accepted by the Board of Construction (Conseil de travaux) on 26 February as meeting the criteria required, finalised on 2 July and approved on 6 July. [3]

The ships of the Jemmapes class were longer than the Furieux with a overall length of 89.6 m (294 ft 0 in), 89.35 m (293 ft 2 in) at the waterline and 86.535 m (283 ft 10.9 in) between perpendiculars, but had a smaller beam of 17.48 m (57 ft 4 in) at the waterline and a smaller mean draught of 6.703 m (21 ft 11.9 in) at deep load. The vessels had a design displacement of 6,575 long tons (6,681  t ), which increased to 6,579 long tons (6,685 t) in service. The complement numbered 299 sailors of all ranks. [3] [4]

The vessels were powered by two triple-expansion steam engines provided by St Denis that each drove one propeller shaft. Steam was provided by 16 coal-burning Lagrafel and d'Allest Belleville boilers. The power plant was rated at 8,400 indicated horsepower (6,300  kW ) at 108 rpm and a pressure of 15 kg/cm2 (210 psi) at the boilers and 12 kg/cm2 (170 psi) at the engines. While undertaking sea trials, Jemmapes reached a speed of 15.68 knots (29.0 km/h; 18.0 mph) from 9,118 ihp (6,799 kW) and Valmy reached 15.92 knots (29.5 km/h; 18.3 mph) from 8,912 ihp (6,646 kW). In service, speed was restricted as a bow wave was created at 13 knots (24 km/h; 15 mph) which, by 15 knots (28 km/h; 17 mph) became impossible to push forward, meaning this became the de facto maximum speed. The ships carried 335 tonnes (330 long tons; 369 short tons) of coal, which gave a range of 2,667 nautical miles (4,939 km; 3,069 mi) at a cruising speed of 10.9 knots (20.2 km/h; 12.5 mph). The maximum load of coal was 350.84 tonnes (345.30 long tons; 386.73 short tons). [3] Once in service, a range of 1,000 nautical miles (1,900 km; 1,200 mi) at 14 knots (25.9 km/h; 16.1 mph) was claimed. [5]

Armament and armor

Jemmapes and Valmy were armed with a main battery of two Canon de 340 mm (13.4 in) Modèle 1887 guns in a two single-gun turrets, one forward of the superstructure and the other aft. The guns were manually-loaded and fired one round every five minutes, but this was sped up between 1900 and 1902 with new equipment. Secondary armament was provided by four 100 mm (3.9 in) 45-calibre M1891 QF guns mounted at the corners of the shelter deck. Defence from torpedo boats was provided by six Canon de 47 mm (1.9 in) Modèle 1885 Hotchkiss guns and eight 37-millimetre (1.5 in) Hotchkiss revolving cannons. [3]

The ships had a full-length waterline armor belt that tapered from the maximum thickness of 460 mm (18 in) amidships to 410 mm (16 in) aft and 310 mm (12 in) forward. The belt was 1.9 m (75 in) high amidships. The armor was hammered steel on the port side and compound armor on the starboard. The turrets were protected by 450 mm (18 in) thick compound armor that was mounted on fixed bases 400 mm (16 in) thick while the gun shields for the secondary armament was provided by hammered steel armor 80 mm (3.1 in) thick. The main deck was protected by 50-millimeter (2 in) thick iron plates. The laminated steel plates protecting the conning tower measured 80 mm (3.1 in) in thickness. The armor was split between Schneider, who provided the steel, and Saint-Chamond, who provided the compound armor, except for the turret, which was completely supplied by the latter firm. [3]

Modifications

During their lives, the ships had their armament modified. In 1906, the torpedo tubes were removed and by the following year six of the 37-mm Hotchkiss revolver cannons had been replaced by four additional 47-mm guns. [3]

Construction and career

Construction data
NameShipyard [6] Laid down [3] Launched [3] Commissioned [3] Cost [7]
Jemmapes Ateliers et Chantiers de la Loire , Saint-Nazaire and Saint-Denis 26 December 188927 April 18924 March 1895£525,000
Valmy Ateliers et Chantiers de la Loire, Saint-Nazaire and Saint Denis18896 October 189214 August 1895£578,957

Jemmapes and Valmy were commissioned into the Northern Squadron (Esadre du Nord) of the French Navy on 4 March and 14 August 1894 respectively, forming a small but formidable force within the French Navy. [8] They were considered more than equal to their smaller German contemporaries, the Odin class and Siegfried class. [9] On 12 March 1895, as part of the naval budget debate, Vice Admiral Armand Bernard declared that the two ships of the class, alongside the related ironclads Amiral Tréhouart and Bouvines, were "the most homogenous and dangerous squadron that one could meet at sea". [10] The ships' service lives were largely uneventful. Between 1 and 23 July 1895 and 6 to 26 July 1896, they took part in large naval exercises in the Atlantic Ocean alongside local defense forces in Brest, Cherbourg, Lorient and Rochefort. [11] [12]

At the end of the century, the vessels were part of the Coastal Defence Division alongside Amiral-Tréhouart and Bouvines. [13] Meanwhile, French naval doctrine was changing and the focus on coastal defense was being replaced by one of larger sea-going warships. The size of ships was also increasing, and newer, more capable battleships entered service. [14] Jemmapes was transferred to reserve in 1902, Valmy following in 1903. Valmy was the first to be struck, on 1 July 1910, Jemmapes following on 3 August. Valmy was put up for sale on 20 July 1911 and broken up. Jemmapes spent some time as a hulk before she being broken up on 5 November 1927. [8]

Notes

  1. Roberts 2021, p. 259.
  2. Roberts 2021, p. 207.
  3. 1 2 3 4 5 6 7 8 9 Roberts 2021, p. 208.
  4. Paloczi-Horvath 1996, p. 49.
  5. Roche 1898, p. 162.
  6. Campbell 1979, p. 302.
  7. Brassey 1897, p. 264, 266.
  8. 1 2 Roberts 2021, p. 209.
  9. Paloczi-Horvath 1996, p. 48.
  10. Roberts 2021, p. 204.
  11. Barry 1896, pp. 187, 190.
  12. Thursfield 1897, p. 167.
  13. Brassey 1899, p. 70.
  14. Paloczi-Horvath 1996, p. 50.

Related Research Articles

French ironclad <i>Hoche</i> Ironclad warship of the French Navy

Hoche was an ironclad battleship built as a hybrid barbette–turret ship for the French Navy in the 1880s. Originally designed in response to very large Italian ironclads along the lines of the French Amiral Baudin class, by the time work on Hoche began, changes in French design philosophy led to a radical re-design that provided the basis for a generation of French capital ships. Her armament was reduced in size compared to the Amiral Baudins, and was placed in the lozenge arrangement that would be used for most French capital ships into the 1890s. Hoche suffered from serious stability problems that resulted from her large superstructure and low freeboard, which required extensive work later in her career to correct. The ship incorporated new technologies for the French Navy, including gun turrets for some of her main battery guns and compound armor plate.

<i>Bouvines</i>-class ironclad

The Bouvines class consisted of a pair of ironclad coastal-defense ships built for the French Navy in the 1890s, Bouvines and Amiral Tréhouart. Thoroughly obsolete by World War I, the ships only played a minor role during the war. They were sold for scrap in 1920.

Portuguese ironclad <i>Vasco da Gama</i> Portuguese ironclad

Vasco da Gama was an ironclad of the Portuguese Navy built in the 1870s by the Thames Iron Works in London. Ordered to strengthen the defenses of the Portuguese capital of Lisbon, Vasco da Gama was launched in 1875 and completed in 1878. She served as the flagship of the Portuguese fleet for the majority of her long and peaceful career. She was rebuilt and heavily modernized between 1901 and 1903. Her crew was involved in revolts in 1913 and 1914; during the latter event, they bombarded Lisbon and killed around one hundred people. Long-since obsolete by the 1930s, Vasco da Gama was finally sold for scrapping in 1935.

In the years before the outbreak of World War I in 1914, the French Navy considered several proposals for battlecruisers. The Navy issued specifications for a battlecruiser design to complete part of the 28 capital ships to be built by 1920. Three designs, one by P. Gille and two by Lieutenant Durand-Viel, were completed in 1913. All three designs were similar to contemporary battleship designs, specifically the Normandie class, which introduced a quadruple gun turret for the main battery, which was adopted for all three proposals. The first two called for the same 340 mm (13.4 in) gun used on all French super-dreadnoughts, though the third proposed a much more powerful 370 mm (14.6 in) gun. Though the design studies were complete, the French Navy did not authorize or begin construction of any battlecruisers before the start of the war.

French ironclad <i>Terrible</i> Ironclad warship of the French Navy

Terrible was an ironclad barbette ship built for the French Navy in the late 1870s and early 1880s. She was the lead ship of the Terrible class, which included three other vessels. They were built as part of a fleet plan started in 1872, which by the late 1870s had been directed against a strengthening Italian fleet. The ships were intended for coastal operations, and as such had a shallow draft and a low freeboard, which greatly hampered their seakeeping and thus reduced their ability to be usefully employed after entering service. Armament consisted of a pair of 420 mm (16.5 in) guns in individual barbettes, the largest gun ever mounted on a French capital ship. Terrible was laid down in 1877 and was completed in 1887.

French ironclad <i>Requin</i> Ironclad warship of the French Navy

Requin was an ironclad barbette ship built for the French Navy in the late 1870s and early 1880s. She was last member of the four-ship Terrible class. They were built as part of a fleet plan started in 1872, which by the late 1870s had been directed against a strengthening Italian fleet. The ships were intended for coastal operations, and as such had a shallow draft and a low freeboard, which greatly hampered their seakeeping and thus reduced their ability to be usefully employed outside of coastal operations after entering service. Armament consisted of a pair of 420 mm (16.5 in) guns in individual barbettes, the largest-caliber gun ever mounted on a French capital ship. Requin was laid down in 1878 and was completed in 1887.

French ironclad <i>Caïman</i> Ironclad warship of the French Navy

Caïman was an ironclad barbette ship built for the French Navy in the late 1870s and early 1880s. She was the third of four ships of the Terrible class, built as part of a fleet plan started in 1872, which by the late 1870s had been directed against a strengthening Italian fleet. The ships were intended for coastal operations, and as such had a shallow draft and a low freeboard, which greatly hampered their seakeeping and thus reduced their ability to be usefully employed after entering service. Armament consisted of a pair of 420 mm (16.5 in) guns in individual barbettes, the largest gun ever mounted on a French capital ship. Caïman was laid down in 1878 and was completed in 1887.

French ironclad <i>Furieux</i> Ironclad warship of the French Navy

Furieux was an ironclad coastal defense ship built for the French Navy in the late 1870s and 1880s. She was ordered under the fleet plan of 1872 that was intended to strengthen the French fleet after the Franco-Prussian War. Originally intended to be similar to the Tonnerre class, Furieux was re-designed after the German Sachsen-class ironclads had begun construction, as the earlier French coastal defense ships were too weak to defeat the Sachsens. Instead of carrying her main armament of two guns in a single gun turret like Tonnerre and other French coastal defense ships, Furieux mounted a pair of guns in two barbettes that allowed her to fire one ahead or astern at any angle. Her guns were significantly larger than the earlier vessels as well, increasing from the 270 mm (10.6 in) guns of her predecessors to 340 mm (13.4 in) weapons. Her design suffered from several problems, including insufficient freeboard and poor stability, both of which reduced her ability to operate in open water. She was also badly overweight, which submerged her belt armor, greatly reducing her defensive characteristics.

French cruiser <i>Surcouf</i> Protected cruiser of the French Navy

Surcouf was the second Forbin-class protected cruiser built for the French Navy in the late 1880s and early 1890s. The Forbin-class cruisers were built as part of a construction program intended to provide scouts for the main battle fleet. They were based on the earlier unprotected cruiser Milan, with the addition of an armor deck to improve their usefulness in battle. They had a high top speed for the time, at around 20 knots, and they carried a main battery of four 138 mm (5.4 in) guns.

French cruiser <i>Coëtlogon</i> Protected cruiser of the French Navy

Coëtlogon was a protected cruiser of the Forbin class built in the late 1880s and early 1890s for the French Navy; she was the last member of her class to be built. The Forbin-class cruisers were built as part of a construction program intended to provide scouts for the main battle fleet. They were based on the earlier unprotected cruiser Milan, with the addition of an armor deck to improve their usefulness in battle. They had a high top speed for the time, at around 20 knots, and they carried a main battery of four 138 mm (5.4 in) guns.

French cruiser <i>Alger</i> Protected cruiser of the French Navy

Alger was the sole member of her class of protected cruiser built for the French Navy in the late 1880s and early 1890s. Alger was ordered during the tenure of Admiral Théophile Aube as Minister of Marine according to the theories of the Jeune École doctrine. The ship was intended as a long-range commerce raider, and she was armed with a main battery of four 164 mm (6.5 in) guns, was protected by an armor deck that was 50 to 100 mm thick, and was capable of steaming at a top speed of 19.5 knots.

French cruiser <i>Chasseloup-Laubat</i> Protected cruiser of the French Navy

Chasseloup-Laubat was a protected cruiser of the Friant class built in the 1890s for the French Navy, the last of three ships of the class. The Friant-class cruisers were ordered as part of a construction program directed at strengthening the fleet's cruiser force. At the time, France was concerned with the growing naval threat of the Italian and German fleets, and the new cruisers were intended to serve with the main fleet, and overseas in the French colonial empire. Chasseloup-Laubat and her two sister ships were armed with a main battery of six 164 mm (6.5 in) guns, were protected by an armor deck that was 30 to 80 mm thick, and were capable of steaming at a top speed of 18.7 knots.

French ironclad <i>Amiral Tréhouart</i>

Amiral Tréhouart was the second and last Bouvines-class ironclad coast-defence ships built for the French Navy in the early 1890s. Completed in 1896, little is known about her service. During World War I, the ship served as a submarine tender. She was sold for scrap in 1920.

French ironclad <i>Jemmapes</i> Coastal defense battleship of the French Navy

Jemmapes was the lead ship of a class of two coastal defense ships built for the French Navy in the 1890s. Launched in 1892, the vessel joined the Northern Squadron of the French Navy at Brest. Armed with a main armament of two 274 mm (10.8 in) guns, the vessel was designed within the principles of the Jeune École. The ship joined the Northern Squadron, which was called, "the most homogenous and dangerous squadron that one could meet at sea". Jemmapes took part in a large naval exercise in 1895 but otherwise had an uneventful career as French naval doctrine moved from a fleet of smaller coastal defense ships to larger ocean-going battleships. The ship was decommissioned in 1910 and served as a hulk before being sold in 1927 to be broken up.

French ironclad <i>Valmy</i> Coastal defense battleship of the French Navy

Valmy was the second member of the Jemmapes class of coastal defense ships built for the French Navy in the 1890s. Launched in 1892, the vessel joined the at Brest. Armed with a main armament of two 274 mm (10.8 in) guns, the vessel was designed within the principles of the Jeune École. The ship served in the Northern Squadron, which Vice Admiral Armand Bernard called, "the most homogenous and dangerous squadron that one could meet at sea". Valmy took part in a large naval exercises in 1895 and 1896 but otherwise had an uneventful career as French naval doctrine moved from a fleet of smaller coastal defense ships to larger ocean-going battleships. The ship was decommissioned after 1909 and sold in 1911 to be broken up.

<i>Tonnerre</i>-class ironclad Coastal-defense ship class of the French Navy

The Tonnerre class was a group of two coastal-defense ships built for the French Navy in the 1870s. A design based on the preceding Bélier-class ram but with similarities to the Royal Navy breastwork monitor Glatton, the class comprised Tonnerre and Fulminant. Their main battery of two 274.4 mm (11 in) was mounted in a single turret powered by a hydraulic machinery, an early use of the technology, that was situated forward of a narrow superstructure and was. The ships could be distinguished by their different engines, the diameter of their single funnel and the slightly different calibre of their secondary armament. They were commissioned into the Armored Division of the Northern Squadron in 1891. They participated in naval exercises. Changes in naval doctrine, alongside the introduction of more capable battleships and new technologies like submarines meant that the ships were obsolete. Tonnerre and Fulminant were struck in 1902 and 1905 respectively and, after serving as target ships, sold to the broken up.

French ironclad <i>Tonnerre</i> Coastal defense breastwork monitor of the French Navy

Tonnerre was the lead ship of a class of two coastal defense breastwork monitors built for the French Navy in the 1870s. Armed with a main armament of two 274.4 mm (11 in) Modèle 1875 guns mounted in a single turret that had armor 300 mm (12 in) thick, the ship was Launched in 1875, the vessel was originally commissioned into reserve at Brest. As French naval doctrine moved from a fleet of smaller coastal defense ships to larger ocean-going battleships, the ship Tonnerre had an uneventful career. Between 1884 and 1885, the ship served in the Evolution Squadron but joined the Northern Squadron in 1891. As part of a naval exercise in 1893, the vessel participated in the successful defence of Cherbourg against a superior force. The ship was struck in 1905 and, after serving as a target, was sold after 1920.

French ironclad <i>Fulminant</i> Coastal defense breastwork monitor of the French Navy

Fulminant was the second of the two ships of the Tonnerre-class, coastal defense breastwork monitors built for the French Navy in the 1870s. Launched in 1877, the ship was armed with a main armament of two 274.4 mm (10.8 in) Modèle 1875 guns mounted in a single turret that had armor 300 mm (12 in) thick. In 1887, the vessel was damaged near Brest while sailing between Cherbourg and Toulon, but was swiftly repaired. From 1891, the ship served in the Northern Squadron (Esadre du Nord}. As French naval doctrine moved from a fleet of smaller coastal defense ships to larger ocean-going battleships, the ship had a short active career. The warship was struck in 1908 and served as a target for the ships of the Mediterranean Squadron. Sunk and raised in 1911, Fulminant was sold a year later and broken up.

French ironclad <i>Tonnant</i> Coastal defense battleship of the French Navy

Tonnant was a coastal defense ship built for the French Navy that served during the last two decades of the nineteenth century. Initially envisaged to mount two 340 mm (13.4 in) guns in a single turret, the design was redone with the guns mounted in two barbette turrets. The vessel pioneered the naval use of the electricity, the power source being used to drive the turrets. Launched in 1880, Tonnant was initially commissioned in reserve and was only intermittently placed into active service. The vessel did not participate in any conflicts. However, in 1889, Tonnant formed part of the force that successfully defended Cherbourg in a naval exercise against the more powerful ironclads of the Channel Squadron. The main armament was removed to be upgraded in 1901 but was not replaced. Instead, the ship was decommissioned in 1902 and was sold in 1905 to be broken up.

References