NAVYPEDIA

Photo

Seattle 1924

Ships

No	Name	Yard No	Builder	Laid down	Launched	Comm	Fate
ACR10	Tennessee, 5.1916- Memphis	322	Cramp, Philadelphia	20.6.1903	3.12.1904	17.7.1906	wrecked 29.8.1916
ACR11, 7.1920- CA11	Washington, 11.1916- Seattle	14	New York SB, Camden	23.9.1903	18.3.1905	7.8.1906	miscellaneous auxiliary 7.1931
ACR12, 7.1920- CA12	North Carolina, 6.1920- Charlotte	57	Newport News	21.3.1905	6.10.1906	7.5.1908	stricken 7.1930
ACR13, 7.1920- CA13	Montana, 6.1920- Missoula	58	Newport News	29.4.1905	15.12.1906	21.7.1908	stricken 7.1930

Technical data

Displacement normal, t	14500
Displacement full, t	ACR10, 11: 15715 ACR12, 13: 15981
Length, m	153.8
Breadth, m	22.2
Draught, m	7.62 mean
No of shafts	2
Machinery	2 VTE, 16 Babcock & Wilcox boilers
Power, h. p.	23000
Max speed, kts	22
Fuel, t	ACR10: coal 1975 ACR11: coal 1939 ACR12, 13: coal 1950
Endurance, nm(kts)	6500(10)
Armour, mm	ACR10, 11: Krupp and Harvey steel - belt: 127 (76 at ship ends), deck: 102 - 38, barbettes: 178 - 102, turrets: 229 - 127, casemates: 127, CT: 229 ACR12, 13: Krupp and Harvey steel - belt: 127 (76 at ship ends), deck: 102 - 38, barbettes: 203 - 102, turrets: 229 - 127, casemates: 127, CT: 229
Armament	ACR10, 11: 2 x 2 - 254/40 Mk III, 16 x 1 - 152/49 Mk VI/VIII, 22 x 1 - 76/50 Mk III/V/VI, 12 x 1 - 47/40-45 Driggs-Schroeder Mk I/II, 2 x 1 - 37/40 Driggs-Schroeder heavy Mk I, 4 - 533 TT (beam) ACR12, 13: 2 x 2 - 254/40 Mk III, 16 x 1 - 152/49 Mk VI/VIII, 22 x 1 - 76/50 Mk III/V/VI, 12 x 1 - 47/40-45 Driggs-Schroeder Mk I/II, 4 x 1 - 37/40 Driggs-Schroeder heavy Mk I, 4 - 533 TT (beam)
Complement	856 - 914

Standard scale images

Graphics

Project history

Authorized under the Acts of 1.7.1902 (first two) and 27.4.1904 (second two). This class was a considerable improvement on previous US armoured cruisers. Of the 152mm guns 12 were on the main deck in two six-gun batteries separated by 6 76mm, and four in upper deck casemates, while of the 22 76mm, 12 were on the main deck and ten on the upper. Considerable use was made of electrical auxiliary machinery, the output of the dynamos being 600kW, 100kW more than in the Pennsylvania class.

Ship protection

Main belt thickness was 127mm. Armoured deck over citadel was 38mm behind the belt at flat part and connected with lower belt edge by 102mm slopes. This deck was 76mm with 102mm slopes at ship ends. Barbette bases connected with armour deck and were 102mm at lower edge. Upper part of barbettes was 178 or 203mm thick. Turrets had 229mm faces, 178mm sides, 127mm rears and 64mm crowns. Secondary guns were protected by 127mm casemates.

Modernizations

1911, all: new cage foremasts were installed

1914 - 1919, all surived: - 12 x 1 - 152/49 (may be temporarily), 10 x 1 - 76/50; + 2 x 1 - 76/52 Mk X

1915, North Carolina (temporarily), 1917, Seattle (temporarily): + 1 catapult, 4 airplanes

Naval service

In 1916-1920 they were renamed to "exempt" names for built battleships. Missoula and Charlotte were both finally decommissioned in 1921, while Seattle was administrative flagship of the US fleet 1923-1927 and then receiving ship at New York until 1941 when she was re-classified as IX39 in February, 1941 and stricken in 1946. Memphis was struck by a 30m high tsunami: a fate not known to have happened to any other ship of her size, in the roadstead of Santo Domingo and was driven ashore, a total wreck.