ARA Rosario (CL-1925)


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The two Rosario class cruisers were the first modern ships to be built in the upgraded and reworked Bahia Blanca shipyards. They were more a statement on how far the Argentine designers and builders had to go than any excellence. The Argentine designers followed a lot of the features of the Germanic States ships that they had in service. The one modern feature they added to the design was the twin turret forward replacing the twinned singles on the bow of the later German ships. The AA weapons at completion were the two 88mm Flak18 guns.

They make a good contrast to the British E class, which had a pair of 6" more (but only one gun broadside more) and a knot or two of speed faster. To attain that superiority the British ship was over 2,000 tons heavier and almost a 100 foot longer.

The various refits added new 37mm AA guns, a new gunnery director for the 5.9" weapons, and a set of six 20mm AA guns around the fore and after bridge superstructures.


Displacement 5,500 tons std, 7,050 tons full load
Length 462 ft
Breadth 47 ft
Draught 18 ft
Machinery 2 shaft Steam Turbines 60,000shp
Speed 32 knots
Range 5000 miles at 12 knots
Armour 2.6" side, 1" deck, 2" turrets
Armament 5 x 5.9" (1x2 3x1)

2 x 88mm (2x1)

5 x 5.9" (1x2 3x1)

2 x 88mm (2x1)

4 x 37mm (2x2)

6 x 20mm (6x1)

Torpedoes 4 x 21" (2x2) 4 x 21" (2x2)
Complement 510
Notes ARA Rosario

ARA Chaco



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