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Florida-class battleship
A large light gray battleship sits in harbor, dark black smoke billows lazily from the central smoke stacks
USS Florida (BB-30)
Class overview
Name: Florida class
Builders: New York Naval Shipyard, New York Shipbuilding Corporation
Operators: US flag 46 stars.svg United States Navy
Preceded by: Delaware class
Succeeded by: Wyoming class
In commission: 1911–1941
Completed: 2
Lost: 1
Retired: 1
Preserved: 0
General characteristics [1]
Type: Battleship
Displacement: Standard: 21,825 long tons (22,175 t)
Length: 521 ft 8 in (159.00 m)
Beam: 88 ft 3 in (26.90 m)
Draft: 28.3 ft (8.6 m)
Installed power: 28,000 shp
Propulsion: Steam turbines, 4 screws
Speed: 21 knots (24 mph, 39 km/h)
Range: 5,776 nmi (6,650 mi; 10,700 km) at 10 kn (12 mph, 19 km/h) and 2,760 nmi (3,180 mi; 5,110 km) at 20 kn (23 mph, 37 km/h)
Coal: 2,500 tons (2,268 tonnes)
Complement: 1,001 officers and men
  • Belt: 9–11 in (229–279 mm)
  • Lower casemate: 8–10 in (203–254 mm)
  • Upper casemate: 5 in (127 mm)
  • Barbettes: 4–10 in (102–254 mm)
  • Turret face: 12 in (305 mm)
  • Conning tower: 11.5 in (292 mm)
  • Decks: 1.5 in (38 mm)

The Florida-class battleships of the United States Navy comprised two ships: Florida and Utah. Launched in 1910 and 1909 respectively and commissioned in 1911, they were slightly larger than the preceding Delaware-class design but were otherwise very similar. This was the first US battleship class in which all ships received steam turbine engines. In the previous Delaware class, one ship received steam turbine propulsion as an experiment while the other retained triple-expansion engines.

Both ships were involved in the 1914 Second Battle of Vera Cruz, deploying their Marine contingents as part of the operation. Following the entrance of the United States into World War I in 1917, both ships were deployed to Europe. Florida was assigned to the British Grand Fleet and based in Scapa Flow; in December 1918 she escorted President Woodrow Wilson to France for the peace negotiations. Utah was assigned to convoy escort duty; she was based in Ireland and was tasked with protecting convoys as they approached the European continent.

Retained under the Washington Naval Treaty of 1922, both ships were modernized significantly, with torpedo bulges and oil-fired boilers installed and other improvements made, but were demilitarized under terms of the 1930 London Naval Treaty. Florida was scrapped, Utah converted into first a radio-controlled target ship, then an anti-aircraft gunnery trainer. She served in the latter role until sunk by the Japanese during the attack on Pearl Harbor on 7 December 1941. Her hull, never raised, remains on the bottom of the harbor as a war memorial.


The Floridas were the third of 10 separate classes built between 1906 and 1919, a total of 22 battleships being commissioned. The new dreadnoughts of the American battle line were being designed from pre-dreadnought experience and observation of foreign designs, as no U.S. dreadnought had yet been commissioned at the time that the Floridas were designed; all were either at some stage of building or in design.[2] American capital ship design was also heavily influenced by war games conducted at the U.S. Navy's Naval War College. Captain William Sims led a reform movement that assigned warship design to the General Board.[3]

These ships were an improvement over the preceding Delaware class. Their engine rooms were larger to hold four Curtis or Parsons steam turbines. Their larger beam gave them greater metacentric height, in which the Delawares were notably deficient, which improved buoyancy and reduced hull stress.[4] The ships mounted new 5 in (127 mm) /51 caliber guns as secondary batteries in casemates that boasted increased armor protection.[1] The class retained the large and fully enclosed conning towers that were adopted for the preceding Delawares, as a result of American studies of the Battle of Tsushima in 1905. The design reduced the vulnerability of the command staff.[5] Overall, these ships were much better protected than their British counterparts, although they were modified extensively during the interwar period.[6]

General characteristics

The Florida-class ships were 510 ft (155.5 m) long at the waterline and 521 ft 8 inches (159 m) overall. They had a beam of 88 ft 3 inches (27 m) and a draft of 28 ft 3 in (8.6 m). They displaced 21,825 tons (22,175 metric tons) at standard displacement and 23,033 tons (22,669 metric tons) at full load.[1] This was an increase of approximately 1,500 short tons (1,400 metric tons) over the previous Delaware-class.[5] The ships also had some of their superstructure rearranged, including the lattice masts and the funnels.[7] The Florida-class ships had a crew of 1,001 officers and men.[5]

The engine rooms on these ships were lengthened to accommodate the larger Parsons steam turbines, which meant the after boiler room had to be eliminated. The remaining boiler rooms were widened by 4 feet (1.2 m); to do this and maintain adequate underwater and coal bunker protection, the ships were made 3 feet (0.91 m) beamier than the Delawares. Funnel spacing was therefore closer than in the Delawares. Also, the wider beam increased the vessels' metacentric height, a quality in which the Delawares were notably deficient. This improvement allowed the Floridas to accommodate their larger medium-caliber guns without any real penalty in topweight.[8]

Florida was fitted experimentally with a larger bridge than was then standard, to house both ship and fire control personnel under armor, while Utah received an heavily armored fire-control tower atop a standard-sized bridge. The former proved especially successful, to the point that when a larger armored fire-control tower and standard bridge was proposed for the Nevada class, it was rejected in favor of a roomier bridge like that of the Florida.[9]

The two ships were modernized in 1925–27; among the improvements were the addition of torpedo bulges, which were designed to increase resistance to underwater damage—this widened the ships to 106 ft (32 m).[7] The ships also had their rear lattice masts removed and replaced with a pole mast. A catapult for launching aircraft was mounted on the center gun turret.[5]


The ships were powered by four-shaft Parsons steam turbines; steam was provided by 12 Babcock & Wilcox coal-fired boilers. The engines were rated at 44,000 shaft horsepower (shp) to give a top speed of 20.75 knots. On trials, Florida made 22.08 knots on 40,511 shp; Utah's turbines produced only 27,028 shp but still propelled the ship at 21.04 knots.[10] However, the engine and boiler room arrangements remained the same as in the Delawares, with the engine room situated between the rear main turrets and steam lines running beneath the superfiring rear turret.[11] The ships had a range of 6,720 nautical miles at a cruising speed of 10 knots.[1][8]

During Florida and Utah's reconstruction in the 1920s, their coal-fired boilers were replaced with four White-Forster oil-fired boilers.[10] The reduction in the number of boilers allowed their twin funnels to be trunked into one single larger funnel.[5]


left side view of a large ship steaming through the water, with two boxy gun turrets in front and three in back, each with two guns.

Port side view of Florida-class battleship, with main guns arranged exactly the same on the Delaware-class ships

Main guns

It was intended originally to arm these ships with eight 14-inch (360 mm) guns then in development in superfiring fore-and-aft mountings.[6] As this gun did not go into service until 1914, the arrangement of ten 12 in (30 cm) Mark 5 45-caliber guns in five twin gun turrets was retained from the Delaware class.[12] The gun housings were the Mark 8 type, and they allowed for depression to −5 degrees and elevation to 15 degrees. The guns had a rate of fire of 2 to 3 rounds per minute. They fired 870 lb (394.6 kg) shells, of either armor-piercing (AP) or Common types, though the Common type was obsolete by 1915 and put out of production. The propellant charge was 310 lb (140.6 kg) in silk bags, and provided a muzzle velocity of 2,700 fps (823 mps). The guns were expected to fire 175 rounds before the barrels would require replacement. The two ships carried 100 shells per gun, or 1,000 rounds in total. At 15 degrees elevation, the guns could hit targets out to approximately 20,000 yards (18,290 m).[13]

Unfortunately, the turret layout of the Delawares was also retained, with its respective challenges. Two turrets were mounted fore in a superfiring pair, while the other three were mounted aft of the main superstructure, all on the centerline. The rearmost turret was placed on the main deck, facing rearward, the next turret was placed on the main deck facing forward, but could only have fired on either broadside, it could not have fired straight forward or aft. The center turret, placed in a superfiring position facing rearward, could not fire astern when the turret directly under it had its guns trained forward. This left only the rearmost turret, with its pair of 12" guns, to cover the rear quarter of the ship.[5] Also, since the engine room was situated between the superfiring rear turret and the ones behind it, steam lines ran from the boiler rooms amidships around the ammunition magazine for Number 3 turret to the engine room. These lines, it was later found, had the potential to heat the powder in the magazine and degrade its ballistics. This design flaw was also prevalent in several British dreadnoughts but was considered inescapable by naval designers on structural grounds.[14]

Starboard forward battery of 5"/51 caliber guns on USS Utah

Secondary guns

C&R proposed 6-inch (150 mm) secondary guns for these ships, protected by 6.5-inch (170 mm) casemate armor. This would have been the only change from the protective scheme carried over from the Delaware class. However, a new 5 in /51 cal gun was adopted instead after concerns about inadequate splinter protection for secondary gun casemates and smoke uptakes led to an increase in armor.[15] Sixteen of these weapons were fitted in individual casemates.[7] These guns fired a 50 lb (22.7 kg) armor-poiercing (AP) shell at a muzzle velocity of 3,150 fps (960 mps) and a rate of 8 to 9 rounds per minute. The guns could depress to −10 degrees and elevate to 15 degrees. The guns were manually operated, and had a range of train of about 150 degrees in either direction.[16]

Anti-aircraft guns

Florida and Utah received two 3 inch 23 caliber guns in 1917 for anti-aircraft (AA) defense. This was increased to eight guns between 1926 and 1928. These guns fired a 13-inch (330 mm) shell at a muzzle velocity of 1,650 feet per second (500 m/s) to a maximum range of 8,800 yards (8,000 m) and ceiling of 18,000 feet (5,500 m) at an elevation of 45.3 degrees and a rate of between eight and nine rounds per minute.[10][17]

Torpedo tubes

The ships were also armed with two 21 inch (53.3 cm) submerged torpedo tubes. The tubes were mounted one on each broadside. The torpedoes were 197 in (5.004 m) long and carried a 200 lb (91 kg) warhead. They had a range of 4,000 yards (3,660 m) and traveled at a speed of 26 knots.[18]


The armor layout was largely the same as in the preceding Delaware-class battleships.[1] The armored belt ranged in thickness from 9 inches (228 mm) to 11 in (280 mm) in the more important areas of the ship. Casemated guns mounted in the hull had between 8–10 inches of armor plate (203–254 mm).[19] After modernization, some of the casemated guns were moved to the superstructure;[7] these guns were protected with only 5 in (127 mm) of armor. The barbettes that housed the main gun turrets were armored with between 4–10 in (102–254 mm) of armor; the side portions more vulnerable to shell fire were thicker, while the front and rear sections of the barbette, which were less likely to be hit, received thinner armor to save weight. The gun turrets themselves were armored with 12 in (305 mm) of armor. The conning tower was 11.5 in (292 mm) thick.[19] The armored deck was slightly reduced in thickness, from 2 in (51 mm) to 1.5 in (38 mm).[20]


A large battleship in dock; the ship is covered with scaffolding, ladders, and other construction equipment.

Florida under construction; the ship is undergoing her final fitting out

Florida, ordered under hull number "Battleship #30", was laid down at the New York Navy Yard on 9 March 1909. She was launched on 12 May 1910, after which fitting out work commenced. Work was finished on 15 September 1911, at which point she was commissioned into the United States Navy. Utah was ordered under hull number "Battleship #31". She was laid down in Camden, New Jersey, at the New York Shipbuilding Corporation, 6 days later on 15 March. Work proceeded faster on Utah than on her sister ship, and she was launched about four and a half months earlier, on 23 December 1909. After launching, she underwent fitting out work, which lasted until 31 August 1911, when she was commissioned into the American fleet.[1]

Service history

USS Florida

Florida took part in the Second battle of Vera Cruz in 1914. She and her sister Utah were the first two ships on the scene; the two ships landed some 1,000 sailors and Marines under the command of Florida's captain on 21 April. Fighting lasted for 3 days; the contingent from Florida and Utah suffered a total of 94 casualties.[1]

A large gray battleship sits in harbor

Florida during the Naval Review in 1911

After the United States entered World War I in April 1917, Florida was dispatched to Europe; she departed the United States in December 1917. After arriving in the North Sea, she was assigned to the Grand Fleet, where she served with her British counterparts.[21] The ship, part of the U.S. Navy's Battleship Division Nine, under the command of Rear Admiral Hugh Rodman, arrived on 7 December and was assigned to the 6th Battle Squadron of the Grand Fleet.[22] Following training exercises with the British fleet, 6th Battle Squadron was tasked with convoy protection duty on the route to Scandinavia.[23] Following the end of the war, in December 1918, the ship escorted President Woodrow Wilson on his trip to Europe to participate in the peace negotiations at Versailles. Later in December, Florida returned to the United States to participate in the Victory Fleet Review in New York harbor.[21]

Post-war, Florida returned the U.S. Navy's Atlantic Fleet; she operated along the east coast of the United States and into Central America. In July 1920, she was assigned the hull number "BB-30". In the early 1920s, she carried the U.S. Secretary of State on a diplomatic trip around the Caribbean and South America.[21] Florida was the oldest American battleship that was retained under the terms of the Washington Naval Treaty of 1922. She underwent extensive reconstruction and modernization during the mid-1920s. After emerging from the shipyard, she was assigned as the flagship of the Control Force, U.S. Fleet. The ship conducted a series of training cruises for the remainder of the decade.[21] Under the London Naval Treaty of 1930, the ship was to be discarded.[1] She was decommissioned in February 1931 and towed to the Philadelphia Naval Shipyard, where she was broken up for scrap.[21]

USS Utah

A large warship rolls over on its side

Utah capsizing during the attack on Pearl Harbor

Utah's first assignment was with the U.S. Navy's Atlantic Fleet. During 1913, she took a goodwill voyage to the Mediterranean.[24] Utah was also involved in the Second Battle of Vera Cruz, alongside her sister Florida. The ship also saw front-line duty in the First World War, although she was not attached to the British Grand Fleet. Starting in September 1918, Utah was based in Bantry Bay, Ireland.[1] Here she conducted convoy escort duties on the approach to Europe.[5]

Post-war service saw Utah again in the Atlantic Fleet; during 1921–22, she was stationed in Europe.[24] Utah was also retained under the Washington Naval Treaty.[5] In 1924–1925, the ship sailed on a goodwill cruise to South America. Following her return to the United States, she was taken into dry dock for significant reconstruction. After she rejoined the active fleet, she was assigned to the U.S. Scouting Fleet. Late in 1928, she steamed to the South Atlantic, where she picked up President-Elect Herbert Hoover, who was returning from an ambassadorial visit to several South American countries.[24]

According to the London Naval Treaty, the ship was to be removed from front-line service. To this end, she had her main battery guns removed and she was converted into a radio-controlled target ship. She was redesignated AG-16, and served in this capacity after 1931. In the mid-1930s, she was rebuilt again, as an anti-aircraft gunnery training ship. In 1941, additional anti-aircraft guns were installed to increase her training capacity. Later in 1941, she was transferred to the U.S. Pacific Fleet and based in Pearl Harbor.[24] She was present in Pearl Harbor on 7 December 1941; after having been hit by two torpedoes, she capsized and sank.[5] A few years later, the hull was partially righted and towed closer to Ford Island, where the wreck remains today.[24]

See also


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Gardiner & Gray 1985, p. 114.
  2. Friedman 1985, p. 96.
  3. Gardiner & Gray 1985, p. 105.
  4. Friedman 1985, p. 71.
  5. 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 Hore 2006, p. 57.
  6. 6.0 6.1 Breyer 1973, p. 199.
  7. 7.0 7.1 7.2 7.3 "Florida Class (BB-30 and BB-31), 1909 Building Program". Naval History & Heritage Command. 26 March 2001. Retrieved 10 August 2009. 
  8. 8.0 8.1 Friedman 1985, p. 74.
  9. Friedman 1985, pp. 72–73.
  10. 10.0 10.1 10.2 Breyer 1973, p. 201.
  11. Friedman 1985, p. 72.
  12. DiGiulian, Tony (27 March 2008). "14"/45 (35.6 cm) Marks 1, 2, 3 and 5". Retrieved 15 May 2012. 
  13. DiGiulian, Tony (18 September 2008). "United States of America 12"/45 (30.5 cm) Mark 5 and Mark 6". Retrieved 10 August 2009. 
  14. Friedman 1985, p. 65.
  15. Friedman 1985, pp. 71–72.
  16. DiGiulian, Tony (25 January 2009). "United States of America 5"/51 (12.7 cm) Marks 7, 8, 9, 14 and 15". Retrieved 10 August 2009. 
  17. "United States of America 3"/23.5 (7.62 cm) Marks 4 and 14, 3"/23 (7.62 cm) Marks 7, 9, 11 and 13". 14 January 2011. Retrieved 8 May 2012. 
  18. DiGiulian, Tony (12 January 2009). "United States of America Torpedoes Pre-World War II". Retrieved 10 August 2009. 
  19. 19.0 19.1 Gardiner & Gray 1985, p. 113.
  20. Gardiner & Gray 1985, pp. 113–114.
  21. 21.0 21.1 21.2 21.3 21.4 "USS Florida (Battleship # 30, later BB-30), 1911–1931". Naval History & Heritage Command. 6 January 2001. Retrieved 10 August 2009. 
  22. Halpern 1995, p. 404.
  23. Halpern 1995, p. 405.
  24. 24.0 24.1 24.2 24.3 24.4 "USS Utah (Battleship # 31, later BB-31 and AG-16), 1911–1941". Naval History & Heritage Command. 9 November 1998. Retrieved 10 August 2009. 


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