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Bahia 1936

Ships

Name	No	Yard No	Builder	Laid down	Launched	Comp	Fate
Bahia			Armstrong, Newcastle, UK	19.8.1907	20.1.1909	2.3.1910	sunk 4.7.1945
Rio Grande do Sul			Armstrong, Newcastle, UK	30.8.1907	20.4.1909	14.5.1910	stricken 6.1948

Technical data

Displacement normal, t	3100
Displacement full, t	3185
Length, m	115.8 pp 122.4 oa
Breadth, m	11.9
Draught, m	4.40 mean
No of shafts	3
Machinery	3 Parsons steam turbines, 10 Yarrow boilers
Power, h. p.	18000
Max speed, kts	26.5
Fuel, t	coal 650
Endurance, nm(kts)	6600(10)
Armour, mm	deck: 19 with 31mm slopes, CT: 76
Armament	10 x 1 - 120/50 Armstrong CC, 6 x 1 - 47/40 Hotchkiss, 2 x 1 - 450 TT
Complement	350

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Project history

Built under the 1906 law, supplementing the extensive shipbuilding programme of 1904. Order was given out in May, 1907 to Armstrong, the subcontract on engines production was received by Vickers.     Design was developed by J. Perret on a basis of British cruisers Adventure and Attentive, but contained a number of innovations doing Brazilian ships one of most perfect on that moment. In particular, in the design using of steam turbines instead of VTEs of prototype has been included, and also Bahia should exceed all available in the world or built cruisers on maximal speed. Bahia and Rio Grande do Sul had a hull structure typical for the time with a forecastle and poop. Because of coal-firing long-term keeping of full speed became problematic. On trials Baia has shown 27.02kts at 20010hp; Rio Grande do Sul 27.41kts at 22830hp.

Ship protection

Protection was limited by 19mm deck, having 31mm slopes over machinery and magazines, and also 76mm conning tower.

Modernizations

(1925 - 1926, Nacional de Navegacao Costeira, Rio de Janeiro), both: machinery was fully replaced by 3 Brown-Curtis geared steam turbines, 6 Thornycroft oil-firing boilers, funnels were replaced by three new (22000hp, 28kts). - 2 x 1 - 47/40, 2 x 1 - 450 TT; + 4 x 1 - 76/40 EOC AA, 2 x 2 - 533 TT

1942 - 1945, both: - 4 x 1 - 47/40; + (6 - 8) x 1 - 20/70 Mk 4, 2 DCT, radar, sonar

Naval service

Bahia was lost 4.7.1945 off island Sao Paolo from explosion of own DCs, called by casual shot from own 20mm MG during gunnery training. Rio Grande do Sul was stricken from fleet inventory 8.6.1948 and broken up.