Pennsylvania-class cruiser

	Color-tinted postcard of USS Pennsylvania, circa 1905–1908
Class overview
Name	Pennsylvania class
Builders	William Cramp & Sons, Philadelphia; Newport News Shipbuilding, Newport News, Virginia; Union Iron Works, San Francisco;
Operators	United States Navy
Preceded by	USS Brooklyn (ACR-3)
Succeeded by	Tennessee class
Built	1901–1908
In commission	1905–1927
Completed	6
Active	0
Lost	1
Scrapped	5
General characteristics (as built)
Type	Armored cruiser
Displacement	13,680 long tons (13,900 t) (standard); 15,138 long tons (15,381 t) (full load);
Length	504 ft (153.6 m)
Beam	69 ft 6 in (21.2 m)
Draft	26 ft 1 in (7.95 m)
Installed power	16 × Babcock & Wilcox boilers (32 × Niclausse boilers in Pennsylvania and Colorado); 23,000 ihp (17,000 kW) (design);
Propulsion	2 × vertical, inverted, triple-expansion engines; 2 × screws;
Speed	22 kn (41 km/h; 25 mph)
Complement	830
Armament	4 × 8 in (203 mm)/40 caliber Mark 5 guns (2 × 2); 14 × 6 in (152 mm)/50 cal Mark 6 guns; 18 × 3 in (76 mm)/50 cal rapid fire (RF) guns; 12 × 3-pounder (47 mm (1.9 in)) RF guns; 2 × 1-pounder (37 mm (1.5 in)) saluting guns; 2 × 18 inch (450 mm) torpedo tubes;
Armor	Belt: 6–5 in (152–127 mm); Turrets: 6.5 in (165 mm); Deck: 4 in (102 mm) slope, 1.5 in (38 mm) flat; Conning Tower: 9 in (229 mm);
General characteristics (1911)
Armament	4 × 8 in/45 cal Mark 6 guns (2 × 2), remainder of armament unchanged
General characteristics (1919)
Armament	4 × 8 in/45 caliber Mark 6 guns (2 × 2) ; 4 × 6 in/50 caliber Mark 6 guns; 10 × 3 in/50 caliber RF guns; 2 × 3 in/50 caliber anti-aircraft guns; All 3-pounder guns removed;

USS *South Dakota* with a cage foremast, circa 1911–1916

The Pennsylvania class of six armored cruisers served in the United States Navy from 1905 to 1927. All six were renamed for cities 1912–1920, to make the state names available for the new battleships beginning with the Pennsylvania-class battleships. All of these served during World War I, with California (then San Diego) being the only ship of the class to be lost. The remaining five armored cruisers were scrapped between 1930 and 1931 in accordance with the London Naval Treaty.

^ Gardiner and Chesneau, p. 148
^ "Ships' Data, U.S. Naval Vessels, 1911". US Navy Department. 1912. pp. 28–35. Retrieved 8 February 2016.
^ "Ships' Data, U.S. Naval Vessels, 1919". US Navy Department. 1 November 1918. pp. 32–37. Retrieved 10 February 2016.

[Conways1-1] Gardiner and Chesneau, p. 148

[ships11-2] "Ships' Data, U.S. Naval Vessels, 1911". US Navy Department. 1912. pp. 28–35. Retrieved 8 February 2016.

[ships19-3] "Ships' Data, U.S. Naval Vessels, 1919". US Navy Department. 1 November 1918. pp. 32–37. Retrieved 10 February 2016.

[1]

[2]

[3]

Class overview
Color-tinted postcard of USS Pennsylvania, circa 1905–1908
Name	Pennsylvania class
Builders	William Cramp & Sons, Philadelphia Newport News Shipbuilding, Newport News, Virginia Union Iron Works, San Francisco
Operators	United States Navy
Preceded by	USS Brooklyn (ACR-3)
Succeeded by	Tennessee class
Built	1901–1908
In commission	1905–1927
Completed	6
Active	0
Lost	1
Scrapped	5
General characteristics (as built)^[1]
Type	Armored cruiser
Displacement	13,680 long tons (13,900 t) (standard) 15,138 long tons (15,381 t) (full load)
Length	504 ft (153.6 m)
Beam	69 ft 6 in (21.2 m)
Draft	26 ft 1 in (7.95 m)
Installed power	16 × Babcock & Wilcox boilers (32 × Niclausse boilers in Pennsylvania and Colorado) 23,000 ihp (17,000 kW) (design)
Propulsion	2 × vertical, inverted, triple-expansion engines 2 × screws
Speed	22 kn (41 km/h; 25 mph)
Complement	830
Armament	4 × 8 in (203 mm)/40 caliber Mark 5 guns (2 × 2) 14 × 6 in (152 mm)/50 cal Mark 6 guns 18 × 3 in (76 mm)/50 cal rapid fire (RF) guns 12 × 3-pounder (47 mm (1.9 in)) RF guns 2 × 1-pounder (37 mm (1.5 in)) saluting guns 2 × 18 inch (450 mm) torpedo tubes
Armor	Belt: 6–5 in (152–127 mm) Turrets: 6.5 in (165 mm) Deck: 4 in (102 mm) slope, 1.5 in (38 mm) flat Conning Tower: 9 in (229 mm)
General characteristics (1911)^[2]
Armament	4 × 8 in/45 cal Mark 6 guns (2 × 2), remainder of armament unchanged
General characteristics (1919)^[3]
Armament	4 × 8 in/45 caliber Mark 6 guns (2 × 2) 4 × 6 in/50 caliber Mark 6 guns 10 × 3 in/50 caliber RF guns 2 × 3 in/50 caliber anti-aircraft guns All 3-pounder guns removed