Florida 1911
Utah 1918
Florida 1929
| No | Name | Yard No | Builder | Laid down | Launched | Comm | Fate |
| BB30 | Florida | New York N Yd, Brooklyn | 9.3.1909 | 12.5.1910 | 15.9.1911 | stricken 4.1931 | |
| BB31 | Utah | 80 | New York SB, Camden | 15.3.1909 | 23.12.1909 | 31.8.1911 | target 4.1932 |
| Data variant | as commissioned |
|
Displacement normal, t |
21825 |
|
Displacement full, t |
23033 |
|
Length, m |
155.5 wl 159.0 oa |
|
Breadth, m |
26.9 |
|
Draught, m |
8.60 |
|
No of shafts |
4 |
|
Machinery |
4 Parsons steam turbines, 12 Babcock & Wilcox boilers |
|
Power, h. p. |
28000 |
|
Max speed, kts |
20.8 |
|
Fuel, t |
coal 2500 + oil 400 |
| Endurance, nm(kts) | 5776(10) |
|
Armour, mm |
belt: 280 - 229, upper belt: 254 - 203, casemate: 127, deck: 38, barbettes: 254 - 102, turrets: 305 (face), CT: 292 |
|
Armament |
5 x 2 - 305/45 Mk VI, 16 x 1 - 127/51 Mk VII, 2 - 533 TT (beam) |
|
Complement |
1001 |
Project history: These were essentially repeat Delawares, the major change being enlargement of the machinery spaces to fit either Parsons or Curtis turbines. As a result of criticism of the Delaware class at the Newport Conference in 1908, this design was modified to incorporate light armour protection (in the form of an upper casemate) for its secondary battery. By way of weight compensation, the proposed 152mm battery was cut back to 127mm/51s, very high-powered weapons which replaced the 127mm/50s of the previous class.
Ship protection: Main belt had 2.44m height (1.3m over and 1.14m under waterline) abreast citadel and was 280mm thick at upper part tapering to 229mm at lower edge. Belt was connected with end barbettes by 254mm bulkheads. There was 2.21m in height upper belt, 254mm at lower and 203mm at upper edges, it was closed by 229mm bulkheads. Casemate had 165mm armour and connected with No2 and 3 barbettes by diagonal 165mm bulkheads. Flat armoured deck connected with upper edge of main belt and was 38mm over machinery and 51mm over magazines. This deck had 63mm thickness fwd from citadel to fore compartment and had 38mm thickness to stem. It was 38mm aft from citadel. There was an additional lower deck over steering gear, 76mm in flat and 76mm in slopes. Main gun turrets had 305mm faces, 203mm sides and rears and 102mm crowns. Barbettes were 254mm at upper and 102mm at lower edges. CT had 102mm roof. Funnel uptakes were unarmoured. Underwater protection was 6.4m deep.
Ship protection after modernization, BB30: Main belt had 2.44m height (1.3m over and 1.14m under waterline) abreast citadel and was 280mm thick at upper part tapering to 229mm at lower edge. Belt was connected with end barbettes by 254mm bulkheads. There was 2.21m in height upper belt, 254mm at lower and 203mm at upper edges, it was closed by 229mm bulkheads. Upper casemate had 165mm armour and connected with No2 and 3 barbettes by diagonal 165mm bulkheads. New main armoured deck (2nd deck) was connected with upper edge of upper belt. It was 88mm thick over magazines and turbines and 120mm over boilers. Its thickness outside of citadel was 114mm. Old flat armoured deck connected with upper edge of main belt and was 38mm over machinery and 51mm over magazines. This deck had 85mm thickness outside of citadel. There was an additional lower deck over steering gear, 120mm in flat and 76mm in slopes. Additional 3rd deck between citadel and stem was strengthened by 44mm armour. Main gun turrets had 305mm faces, 203mm sides and rears and 102mm crowns. Barbettes were 254mm at upper and 102mm at lower edges. CT had 102mm roof. Funnel uptakes were unarmoured. Underwater protection was deepened by bulges fitting.
Ship protection after modernization, BB31: Main belt had 2.44m height (1.3m over and 1.14m under waterline) abreast citadel and was 280mm thick at upper part tapering to 229mm at lower edge. Belt was connected with end barbettes by 254mm bulkheads. There was 2.21m in height upper belt, 254mm at lower and 203mm at upper edges, it was closed by 229mm bulkheads. Upper casemate had 165mm armour and connected with No2 and 3 barbettes by diagonal 165mm bulkheads. New main armoured deck (2nd deck) was connected with upper edge of upper belt. It was 88mm thick over magazines and turbines and 120mm over boilers. Its thickness outside of citadel was 108mm. Old flat armoured deck connected with upper edge of main belt and was 38mm over machinery and 51mm over magazines. This deck had 85mm thickness outside of citadel. There was an additional lower deck over steering gear, 120mm in flat and 76mm in slopes. Additional 3rd deck between citadel and stem was strengthened by 44mm armour. Battery deck had 19mm armour. Main gun turrets had 305mm faces, 203mm sides and rears and 102mm crowns. Barbettes were 254mm at upper and 102mm at lower edges. CT had 102mm roof. Funnel uptakes were unarmoured. Underwater protection was deepened by bulges fitting.
Modernizations: 1916, both: + 2 x 1 - 76/52 Mk X
1918, both: + 4 x 1 - 76/52 Mk X
1919, both: + 2 x 1 - 76/52 Mk X
(1924 - 4.1925, Boston NYd) Florida, (10/1925 - 8.1926, Boston NYd) Utah: were modernized as given in the table. New bulges and boilers were fitted, horizontal armour was streghtened, secondary guns were moved one deck up.
| Data variant | 1925-1926 modernization |
|
Displacement standard, t |
21986 |
|
Displacement full, t |
22726 |
|
Length, m |
155.4 wl 159.0 oa |
|
Breadth, m |
32.3 |
|
Draught, m |
9.65 |
|
No of shafts |
4 |
|
Machinery |
4 Parsons steam turbines, 4 White Foster boilers |
|
Power, h. p. |
28000 |
|
Max speed, kts |
21 |
|
Fuel, t |
oil 2580 |
| Endurance, nm(kts) | 16500(10) (using emergency fuel oil) |
|
Armour, mm |
belt: 203 - 280, deck: 127 over magazines, 114 over machines, 146 over boilers, 64 fore, 76 aft, barbettes: 254 - 102, turrets: 305 (face), CT: 292 |
|
Armament |
5 x 2 - 305/45 Mk 6, 12 x 1 - 127/51 Mk 8, 8 x 1 - 76/52 Mk 10, 1 catapult, 3 seaplanes (UO) |
|
Complement |
1171 |
Naval service: Florida in 1917-1918 served with Grand Fleet 6th squadron. Utah from 9.1918 served with USN task force based in Ireland. After war there were oldest battleships of US Navy under the Washington Treaty, modernized in the late twenties, but stricken under terms of London Treaty of 1930. Florida was scrapped, and Utah was used as radio-controlled target. She was sunk in Pearl Harbour after Japanese attack 7.12.1941.
Florida 1912
Florida
Florida at Grand Fleet
Utah after modernization 1930
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