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Brazilian monitor Ceará

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History
Empire of Brazil
NameCeará
NamesakeCeará
Ordered1866
BuilderArsenal de Marinha da Côrte, Rio de Janeiro
Laid down8 December 1866
Launched22 March 1868
CompletedApril 1868
FateScrapped 1884
General characteristics
Class and typePará-class monitor
Displacement500 metric tons (490 long tons)
Length39 m (127 ft 11 in)
Beam8.54 m (28 ft 0 in)
Draft1.51–1.54 m (4 ft 11 in – 5 ft 1 in) (mean)
Installed power180 ihp (130 kW)
Propulsion2 shafts, 2 steam engines, 2 boilers
Speed8 knots (15 km/h; 9.2 mph)
Complement8 officers and 35 men
Armament1 × 120-pounder Whitworth gun
Armor
  • Belt: 51–102 mm (2.0–4.0 in)
  • Gun turret: 76–152 mm (3.0–6.0 in)
  • Deck: 12.7 mm (0.50 in)

The Brazilian monitor Ceará was the fifth ship of the Pará-class river monitors built for the Brazilian Navy during the Paraguayan War in the late 1860s. Ceará arrived in Paraguay in mid-1868 and provided fire support for the army for the rest of the war. The ship was assigned to the Mato Grosso Flotilla after the war. Ceará was scrapped in 1884.

Design and description

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The Pará-class monitors were designed to meet the need of the Brazilian Navy for small, shallow-draft armoured ships capable of withstanding heavy fire. The monitor configuration was chosen as a turreted design did not have the same problems engaging enemy ships and fortifications as did the central battery ironclads already in Brazilian service. The oblong gun turret sat on a circular platform that had a central pivot. It was rotated by four men via a system of gears; 2.25 minutes were required for a full 360° rotation. A bronze ram was fitted to these ships as well. The hull was sheathed with Muntz metal to reduce biofouling.[1]

The ships measured 39 meters (127 ft 11 in) long overall, with a beam of 8.54 meters (28 ft 0 in). They had a draft between of 1.51–1.54 meters (4 ft 11 in – 5 ft 1 in) and displaced 500 metric tons (490 long tons).[2] With only 0.3 meters (1 ft 0 in) of freeboard they had to be towed between Rio de Janeiro and their area of operations.[1] Their crew numbered 43 officers and men.[2]

Propulsion

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The Pará-class ships had two direct-acting steam engines, each driving a single 1.3-meter (4 ft 3 in) propeller. Their engines were powered by two tubular boilers at a working pressure of 59 psi (407 kPa; 4 kgf/cm2). The engines produced a total of 180 indicated horsepower (130 kW) which gave the monitors a maximum speed of 8 knots (15 km/h; 9.2 mph) in calm waters. The ships carried enough coal for one day's steaming.[3]

Armament

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Ceará had a single 120-pounder Whitworth rifled muzzle loader (RML) in her gun turret. The gun had a maximum range of about 5,540 meters (6,060 yd).[4] The 7-inch (178 mm) shell of the 120-pounder gun weighed 151 pounds (68.5 kg) while the gun itself weighed 16,660 pounds (7,556.8 kg).[5] Most unusually the guns' Brazilian-designed iron carriage was designed to pivot vertically at the muzzle; this was done to minimize the size of the gunport through which splinters and shells could enter.[6]

Armor

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The hull of the Pará-class ships was made from three layers of wood that alternated in orientation. It was 457 millimeters (18.0 in) thick and was capped with a 102-millimeter (4 in) layer of peroba hardwood. The ships had a complete wrought iron waterline belt, 0.91 meters (3.0 ft) high. It had a maximum thickness of 102 millimetres amidships, decreasing to 76 millimeters (3 in) and 51 millimeters (2 in) at the ship's ends. The curved deck was armored with 12.7 millimeters (0.5 in) of wrought iron.[1]

The gun turret was shaped like a rectangle with rounded corners. It was built much like the hull, but the front of the turret was protected by 152 millimeters (6 in) of armor, the sides by 102 millimetres and the rear by 76 millimetres. Its roof and the exposed portions of the platform it rested upon were protected by 12.7 millimetres of armor. The armored pilothouse was positioned ahead of the turret.[1]

Service

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Ceará was laid down at the Arsenal de Marinha da Côrte in Rio de Janeiro on 8 December 1866, during the Paraguayan War, which saw Argentina and Brazil allied against Paraguay. She was launched on 22 March 1868 and commissioned the following month. The monitor arrived in Paraguay in May 1868. On 31 August she bombarded enemy positions on the Tebicuary River to provide cover for advancing troops. The ship destroyed Paraguayan defenses on the Manduvirá River on 18 April 1869.[7] Ceará, together with her sister ships Piauí and Santa Catharina, broke through the Paraguayan defenses at Guaraio on 29 April and drove off the defenders.[8] After the war she was assigned to the Mato Grosso Flotilla and was scrapped in 1884.[7]

Footnotes

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  1. ^ a b c d Gratz, p. 153
  2. ^ a b Gratz, p. 154
  3. ^ Gratz, pp. 154–56
  4. ^ Gratz, pp. 153–54
  5. ^ Holley, p. 34
  6. ^ Gratz, p. 155
  7. ^ a b Gratz, p. 157
  8. ^ Donato, p. 300

References

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  • Donato, Hernâni (1996). Dicionário das batalhas brasileiras. Biblioteca "Estudos brasileiros" (in Portuguese). Vol. 17. São Paulo: Instituição Brasileira de Difusão Cultural. OCLC 19455576.
  • Gratz, George A. (1999). "The Brazilian Imperial Navy Ironclads, 1865–1874". In Preston, Antony (ed.). Warship 1999–2000. London: Conway Maritime Press. ISBN 0-85177-724-4.
  • Holley, Alexander Lyman (1865). A Treatise on Ordnance and Armor. New York: D. Van Nostrand.
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