Vermont 1910
|
No |
Name |
Yard No |
Builder |
Laid down |
Launched |
Comm |
Fate |
|
BB20 |
Vermont |
120 |
Fore River, Quincy |
21.5.1904 |
31.8.1905 |
4.3.1907 |
stricken 11.1923 |
|
BB21 |
Kansas |
21 |
New York SB, Camden |
10.2.1904 |
12.8.1905 |
18.4.1907 |
stricken 11.1923 |
|
BB22 |
Minnesota |
46 |
Newport News |
27.10.1903 |
8.4.1905 |
9.3.1907 |
stricken 11.1923 |
|
BB25 |
New Hampshire |
29 |
New York SB, Camden |
1.5.1905 |
30.6.1906 |
19.3.1908 |
stricken 11.1923 |
|
Displacement normal, t |
16000 |
|
Displacement full, t |
17666 |
|
Length, m |
139.1 |
|
Breadth, m |
23.4 |
|
Draught, m |
7.47 |
|
No of shafts |
2 |
|
Machinery |
2 VTE, 12 Babcock & Wilcox boilers |
|
Power, h. p. |
16500 |
|
Max speed, kts |
18 |
|
Fuel, t |
BB20: coal 2405 BB21: coal 2310 BB22: coal 2387 BB25: coal 2287 |
|
Endurance, nm(kts) |
BB20 - 22: 6620(10) BB25: 7590(10) |
|
Armour, mm |
BB20 - 22: Krupp and Harvey steel - belt: 229 - 178 (178 - 102 at ship ends), bulkheads: 178, deck: 76 - 38, barbettes: 254 - 152, main gun turrets: 305 - 203, secondary gun turrets: 165 - 51, casemates: 178 - 95, CT: 229 BB25: Krupp and Harvey steel - belt: 229 - 178 (178 - 102 at ship ends), bulkheads: 178, deck: 76 - 38, barbettes: 279 - 152, main gun turrets: 305 - 203, secondary gun turrets: 165 - 51, casemates: 178 - 95, CT: 229 |
|
Armament |
BB20: 2 x 2 - 305/45 Mk V, 4 x 2 - 203/45 Mk VI, 12 x 1 - 178/44 Mk II, 20 x 1 - 76/50 Mk III/V/VI, 10 x 1 - 47/40 Hotchkiss Mk I / Driggs-Schroeder Mk I, 2 x 1 - 37/40 Hotchkiss heavy Mk I/II/III / Driggs-Schroeder heavy Mk I, 4 - 533 TT (beam) BB21, 22: 2 x 2 - 305/45 Mk V, 4 x 2 - 203/45 Mk VI, 12 x 1 - 178/44 Mk II, 20 x 1 - 76/50 Mk III/V/VI, 12 x 1 - 47/40 Hotchkiss Mk I / Driggs-Schroeder Mk I, 2 x 1 - 37/40 Hotchkiss heavy Mk I/II/III / Driggs-Schroeder heavy Mk I, 4 - 533 TT (beam) BB25: 2 x 2 - 305/45 Mk V, 4 x 2 - 203/45 Mk VI, 12 x 1 - 178/44 Mk II, 20 x 1 - 76/50 Mk III/V/VI, 2 x 1 - 37/40 Hotchkiss heavy Mk I/II/III / Driggs-Schroeder heavy Mk I, 4 - 533 TT (beam) |
|
Complement |
BB20 - 22: 880 BB25: 850 |
Project history: Authorized under the Acts of 3.3.1903 (first three) and 27.4.1904 (last one). The first three ships of this class were very similar to the Connecticut, from which they differed in details of armouring. In New Hampshire the 305mm mountings allowed loading at any angle of elevation, the arrangement of the 7in upper belt and bulkheads was slightly altered. Distinguished from earlier USN battleships by very good seaworthiness.
Ship protection, BB20-22: Main belt had 2.82m height (1.3m over and 1.52m under waterline). 58.5m long amidships part of belt was 229mm thick. 14.9m fore and aft parts of belt were 229mm at upper edge tapering to 178mm at lower edge. Ship ends were closed by 2.43m in height (0.91m over and 1.52m under wateline) 178-127mm, later 127mm and finally 102mm armour. Belt was connected with main gun barbettes by 152mm bulkheads. Upper belt between main barbettes had 152mm thickness. 38mm armoured deck over citadel had 76mm slopes and connected with lower edge of main belt. It was 76mm in flat part and had 76mm slopes at ship ends. Main gun turrets had 279mm faces, 229mm sides and rears and 64mm crowns. Secondary gun turrets had 165mm faces, 152mm sides and rears and 51mm crowns. 178mm guns were protected by 178mm casemate with 63-38mm transverse splinter bulkheads between guns. CT had 229mm sides and 51mm roof.
Ship protection, BB25: Main belt had 2.82m height (1.3m over and 1.52m under waterline). 58.5m long amidships part of belt was 229mm thick. Next 14.9m fore and aft parts of belt were 229mm at upper edge tapering to 178mm at lower edge. Ship ends were closed by 2.43m in height (0.91m over and 1.52m under wateline) 178-127mm, later 127mm and finally 102mm armour. Belt was connected with main gun barbettes by 178mm bulkheads. Upper belt between main barbettes had 152mm thickness. 38mm armoured deck over citadel had 76mm slopes and connected with lower edge of main belt. It was 76mm in flat part and had 76mm slopes at ship ends. Main gun turrets had 279mm faces, 229mm sides and rears and 64mm crowns, their barbettes had 279mm sides (190mm at inner side). Secondary gun turrets had 165mm faces, 152mm sides and rears and 51mm crowns. 178mm guns were protected by 178mm casemate with 63-38mm transverse splinter bulkheads between guns. CT had 229mm sides and 51mm roof.
Modernizations: 1909 - 1910, Vermont: - 10 x 1 - 47/40; cage masts were installed.
1909 - 1910, Kansas, Minnesota: - 12 x 1 - 47/40; cage masts were installed.
1919, all: - 12 x1 - 178/44 (may be temporarily), 8 x 1 - 76/50; + 2 x 1 - 76/52 Mk X
Naval service: Minnesota 29.9.1918 was badly damaged by a mine laid by German submarine U117 but has been repaired and again put into operation. All ships were stricken under the terms of Washington Treaty.
Kansas 1912
Minnesota as built
New Hampshire
© Ivan Gogin, 2014