Maryland 1905
| No | Name | Builder | Laid down | Launched | Comm | Fate |
| ACR4, 7/1920- CA4 | Pennsylvania, 8/1912- Pittsburgh | Cramp, Philadelphia | 7/8/1901 | 22/8/1903 | 9/3/1905 | stricken 10/1931 |
| ACR5, 7/1920- CA5 | West Virginia, 11/1916- Huntington | Newport News | 16/9/1901 | 18/4/1903 | 23/2/1905 | stricken 3/1930 |
| ACR6 | California, 9/1914- San Diego | Union Iron Wks, San Francisco | 7/5/1902 | 28/4/1904 | 1/8/1907 | sunk 19/7/1918 |
| ACR7, 7/1920- CA7 | Colorado, 11/1916- Pueblo | Cramp, Philadelphia | 25/4/1901 | 25/4/1903 | 19/1/1905 | BU 10/1930 |
| ACR8, 7/1920- CA8 | Maryland, 11/1916- Frederick | Newport News | 29/10/1901 | 12/9/1903 | 18/4/1905 | stricken 11/1929 |
| ACR9, 7/1920- CA9 | South Dakota, 6/1920- Huron | Union Iron Wks, San Francisco | 30/9/1902 | 21/7/1904 | 27/1/1908 | stricken 11/1929 |
|
Displacement normal, t |
13680 |
|
Displacement full, t |
15138 |
|
Length, m |
153.6 |
|
Breadth, m |
21.2 |
|
Draught, m |
7.34 |
|
No of shafts |
2 |
|
Machinery |
ACR4, 7: VTE, 32 Niclausse boilers ACR5, 6, 8, 9: VTE, 16 Babcock & Wilcox boilers |
|
Power, h. p. |
23000 |
|
Max speed, kts |
22 |
|
Fuel, t |
ACR4, 7: coal 1980 ACR5, 8: coal 1850 ACR6, 9: coal 2075 |
| Armour, mm |
Krupp and Harvey steel - belt: 152 - 127, (89 at ships ends), deck: 102 - 38, barbettes: 152 - 76, turrets: 165 - 152, casemates: 127, CT: 229 |
|
Armament |
2 x 2 - 203/40 Mk 5, 14 x 1 - 152/50 Mk 6, 18 x 1 - 76/50 Mk 2/3/5/6, 12 x 1 - 47/(40 - 50) Mk 1 - 12, 2 x 1 - 37/(20 - 50) Mk 1 - 15, 2 - 450 TT (beam) |
|
Complement |
829 - 928 |
Ship project history: The first armoured cruisers of USN built in large series. They had too weak armament for their displacement (both on calibre, and by number of guns). At rather thin side armour a role of main protection against enemy shells was by the thick main deck slopes played, that in aggregate provided protection almost equivalent to protection of battleships of that time. In 1912-1916 they were renamed in in connection with a laying down of battleships with the same names.
Ship protection: Main belt covered machinery only. Its thickness was 127mm except 152mm waterline. Armoured deck over citadel was 38mm behind the belt at flat part and connected with lower belt edge by 102mm slopes. This deck was 102mm with 102mm slopes at ship ends. Barbette bases and ammunition tubes had 76mm protection. Upper part of barbettes was 152mm thick. Turrets had 165-152mm sides and 38mm crowns. Secondary guns were protected by 127mm casemates.
Modernizations: 1909 - 1911, all: - 2 x 2 - 203/40 Mk 5; + 2 x 2 - 203/45 Mk 6; new cage foremasts were installed
1914 - 1919, Pittsburgh: - 6 x 1 - 152/50 (may be temporarily), (6 - 8) x 1 - 76/50; + 2 x 1 - 76/50 Mk 10 AA; boilers were replaced by 16 Babcock & Wilcox
1914 - 1919, Huntington, San Diego, Frederick, Huron: - 10 x 1 - 152/50 (may be temporarily), (6 - 8) x 1 - 76/50; + 2 x 1 - 76/50 Mk 10 AA
1914 - 1919, Pueblo: - 10 x 1 - 152/50 (may be temporarily), (6 - 8) x 1 - 76/50; + 2 x 1 - 76/50 Mk 10 AA; boilers were replaced by 16 Babcock & Wilcox
1917, Huntington (temporarily): + 1 catapult, 4 airplanes, 1 balloon
1922, Pittsburgh: 4 boilers and 1 funnel were removed.
Naval service: Pennsylvania made the first launch of shipboard aircraft in 1911, being used in experiments with Curtis pusher airplanes. San Diego was lost by reason of an underwater explosion (from a torpedo from German submarine U156 or from a mine). It became the largest warloss of US Navy in First world war.
Pittsburgh 1919
Huron 1923
© Ivan Gogin, 2008-10