page_title: Rivadavia-class battleship
section_title: Specifications
hierarchical_section_title: Rivadavia-class battleship / Specifications
caption_attribution_description: Plans for the Argentine Rivadavia-class battleships
context_page_description: The Rivadavia class consisted of two battleships designed by the American Fore River Shipbuilding Company for the Argentine Navy. Named Rivadavia and Moreno after important figures in Argentine history, they were Argentina's entry in the South American dreadnought race and a counter to Brazil's two Minas Geraes-class battleships.
  In 1904, Brazil scrapped a previous naval building program in favor of an order that included three warships of the new "dreadnought" type, despite signs that such an action would spark a South American naval arms race. To counter this acquisition by a major rival, Argentina began seeking bids for at least two dreadnoughts in 1908. Over the next two years, shipbuilders from five countries vied for the contracts, complemented by efforts from their respective governments. Argentina was able to play this hyper-competitive environment to its own advantage by rejecting all of the initial proposals and calling for new ones that required the best aspects of each. They then repeated this process, despite complaints from shipbuilders that their trade secrets were being given away. The contracts were awarded to the lowest bidder, Fore River, in early 1910.
context_section_description: The two ships of the Rivadavia class were 594 feet 9 inches (181.28 m) overall and 585 feet (178 m) between perpendiculars. They had a beam of 98 feet 4.5 inches (29.985 m), a normal draft of 27 feet 8.5 inches (8.446 m), and displaced 27,500 long tons (27,900 t) normally and 30,100 long tons (30,600 t) at full load. The ships were staffed by 130 officers and about 1000 enlisted men.
  For armament, the Rivadavia class was equipped with a main battery of twelve 12-inch/50 caliber guns, a secondary battery of twelve 6 inch (152 mm)/50 and twelve 4-inch (102 mm)/50 QF, and two 21-inch (533 mm) torpedo tubes.
  The 12"/50 was a Bethlehem development. It was most likely based on the weapon used in the United States' Wyoming-class battleship, the 12"/50 caliber Mark 7 gun. The twelve guns were mounted in six twin turrets. Four turrets were superfiring fore and aft, while the other two were located en echelon in wing turrets. The latter weapons could, in theory, fire on a 180° range on their respective sides of the hull and 100° on the other, but in reality this was not possible, as the blast damage from the weapons would damage the ship. A more reasonable estimate would be 90° on their sides. The 6-inch secondary armament was placed in casemates, with six on either side of the ship. For protection, they were provided with 6 inches of armor. The 4-inch weaponry, intended for use against marauding destroyers, was mounted unarmored in various places around the ship, including the main deck, superstructure, and far up near the bow. As originally built, there were sixteen 4-inch guns, but four of those were replaced with four 3-inch AA guns and four 3-pounders during the 1924–1926 modernization. The torpedo tubes were located underneath the waterline and were loaded in a dedicated compartment.
  Full ammunition loads were 1,440 rounds for the 12-inch guns (120 per gun), 3,600 rounds for the 6-inch (300), 5,600 rounds for the 4-inch (350), and 16 torpedoes manufactured by Whitehead. To assist the main battery with targeting during a battle, the two ships were equipped with two Barr & Stroud rangefinders that were located above the conning towers.
  Rivadavia and Moreno used Brown–Curtis geared steam turbines, powered by 18 Babcock & Wilcox boilers and connected to three propellers. With a total output of about 40,000 shaft horsepower (30,000 kW), the ships were designed to travel at a maximum speed of 22.5 knots (41.7 km/h; 25.9 mph) and may have been capable of slightly more. At speeds of 11 to 15 knots (20 to 28 km/h; 13 to 17 mph), their endurance ranged from 11,000 to 7,000 nautical miles (20,000 to 13,000 km; 12,700 to 8,100 mi), respectively. Their fuel was a coal–oil mix and the ships carried 3,900 long tons (4,000 t) of the former and 590 long tons (600 t) of the latter.
  Typical of American-designed dreadnoughts at the time, the Rivadavia class included substantial armor protection. A 12-inch (300 mm) belt was fitted amidships, covering 5 feet (1.5 m) above and 6 feet (1.8 m) below the designed waterline, gradually decreasing towards the bow and stern to 5 inches (130 mm) and 4 inches (100 mm), respectively. The gun turrets received heavy armor, including 12 inches (300 mm) on the front, 9 inches (230 mm) on the sides, 9.5 inches (240 mm) on the back, and 4 inches (100 mm) on the top. Deck armor consisted of .5 inches (13 mm) medium steel and 2 inches (51 mm) nickel steel.
caption: The Rivadavia class were the second dreadnought class purchased by a South American country and the only ones to not be built by a British company. Ordered in response to the Minas Geraes class, they mounted the same-size main battery as the Brazilian ships (12-inch), but the Argentine ships were much larger and significantly better-armored.[60]
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