French ironclad Colbert

The French ironclad Colbert was the lead ship of the Colbert-class ironclads that were built for the French Navy in the 1870s. The ship was the flagship of the Mediterranean Squadron for most of her career. She took part in the French occupation of Tunisia, notably shelling and landing troops in Sfax on 15–16 July 1881. Colbert was paid off in 1895 and condemned in 1900. The ship was finally sold for scrap in 1909.

Design and description
The Colbert-class ships were designed by Constructor Sabattier as improved versions of the ironclad FRENCH IRONCLAD Richelieu. As a central battery ironclad, Colbert had her armament concentrated amidships. Like most ironclads of her era she was equipped with a plough-shaped ram. Her crew numbered 774 officers and men. The metacentric height of the ship was low, a little above 2 ft.

The ship measured 101.1 m overall, with a beam of 17.4 m. Colbert had a maximum draft of 8.5 m and displaced 8617 t.

Propulsion
Colbert reverted to a single propeller shaft to improve her sailing qualities. She had one Wolf 3-cylinder horizontal return connecting rod compound steam engine. The engine was powered by eight oval boilers and was designed for a capacity of 4600 ihp. On sea trials the engine produced 4652 ihp and Colbert reached 14.75 kn. She carried a maximum of 620 MT of coal which allowed her to steam for approximately 3300 nmi at a speed of 10 kn. Colbert was ship rigged with three masts and had a sail area around 23000 sqft.

Armament
Colbert had two 274 mm guns mounted in barbettes on the upper deck, one gun at the forward corners of the battery, with six additional guns on the battery deck below the barbettes. The side of the upper deck were cut away to improve the ability of the barbette guns to bear fore and aft. One 240 mm was mounted in the forecastle as a chase gun. The ship's secondary armament consisted of six 138 mm guns, four forward of the battery and two aft. These latter two guns were replaced in 1878 by another 240-millimetre gun as a stern chaser. The ship also mounted four above-water 356 mm torpedo tubes were added.

The 18-caliber 274-millimeter Modèle 1870 gun fired an armor-piercing, 476.2 lb shell while the gun itself weighed 22.84 LT. The gun fired its shell at a muzzle velocity of 1424 ft/s and was credited with the ability to penetrate a nominal 14.3 in of wrought iron armor at the muzzle. The armor-piercing shell of the 19-caliber 240-millmeter Modèle 1870 gun weighed 317.5 lb while the gun itself weighed 15.41 LT. It had a muzzle velocity of 1624 ft/s and was credited with the ability to penetrate a nominal 14.4 in of wrought iron armor at the muzzle. The 138-millimeter gun was 21 calibers long and weighed 2.63 LT. It fired a 61.7 lb explosive shell that had a muzzle velocity of 1529 ft/s. The guns could fire both solid shot and explosive shells.

At some point the ship received fourteen to eighteen 37 mm Hotchkiss 5-barrel revolving guns. They fired a shell weighing about 500 g at a muzzle velocity of about 610 m/s to a range of about 3200 m. They had a rate of fire of about 30 rounds per minute.

Armor
The Colbert-class ships had a complete wrought iron waterline belt that was 220 mm thick amidships and tapered to 180 mm at the stern. It was backed by 89 mm of wood. The sides of the battery itself were armored with 160 mm of wrought iron, backed by 62 mm of wood, and the ends of the battery were closed by transverse armored bulkheads 120 mm thick, backed by 480 mm of wood. The barbettes were unarmored, but the deck was 15 mm thick.

Service
Colbert was named in honor of Jean-Baptiste Colbert, Controller-General of Finances from 1665 to 1683 under King Louis XIV. She was laid down at Brest in 1869 and launched on 16 September 1875. While the exact reason for such prolonged construction time is not known, it is believed that reduction of the French Navy's budget after the Franco-Prussian War of 1870–71 and out-of-date work practices in French dockyards were likely causes. The ship began her sea trials on 23 May 1877, but became flagship of the Reserve Squadron on 31 August 1878. On 1 October 1879 she became the flagship of the Mediterranean Squadron; which post she would hold until 14 January 1890 when she was placed in reserve. Colbert bombarded the Tunisian port of Sfax on 15–16 July 1881 as the French occupied Tunisia. She became flagship of the Reserve Squadron again on 12 April 1892 until she was paid off in 1895. She was condemned on 11 August 1900, before being sold for scrap in 1909.