Brazilian ironclad Rio de Janeiro

	Rio de Janeiro sunk by contact mines near Curuzú, River Paraguay
Class overview
Operators	Imperial Brazilian Navy
Preceded by	Tamandaré
Succeeded by	Mariz e Barros class
Built	1865–66
In commission	1866
Completed	1
Lost	1
History
Empire of Brazil
Name	Rio de Janeiro
Namesake	Rio de Janeiro
Builder	Arsenal de Marinha da Corte
Cost	£47,409
Laid down	28 June 1865
Launched	18 February 1866
Completed	1 March 1866
Commissioned	April 1866
Fate	Sunk 2 September 1866
General characteristics
Type	Armored gunboat
Displacement	871 metric tons (857 long tons) (normal); 1,001 metric tons (985 long tons) (deep load);
Length	56.69 m (186 ft 0 in)
Beam	9.19 m (30 ft 2 in)
Draft	2.62 m (8.6 ft) (mean)
Installed power	320 ihp (240 kW)
Propulsion	1 shaft, 1 steam engine, 2 boilers
Sail plan	Schooner-rigged
Speed	9 knots (17 km/h; 10 mph)
Complement	148 officers and men
Armament	2 × rifled 70-pounder Whitworth guns; 2 × smoothbore 68-pounder guns;
Armor	Belt: 51–102 mm (2.0–4.0 in); Casemate: 102 mm (4.0 in); Deck: 12.7 mm (0.50 in);

The Brazilian ironclad Rio de Janeiro was an armored gunboat (Portuguese: Canhoneira Couraçada Nr. 3) built for the Brazilian Navy during the Paraguayan War in the mid-1860s. Like the other two gunboats she was built in Brazil and was designed as a casemate ironclad. Commissioned in April 1866, the ship did not enter combat until September, when she bombarded Paraguayan fortifications at Curuzu. Rio de Janeiro hit two mines on 2 September and rapidly sank, taking 53 of her crew with her.

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