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MONTANA battleships


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Ships


No Name Yard No Builder Laid down Launched Comm Fate
BB67 Montana   Philadelphia N Yd --- --- --- cancelled 21/7/1943
BB68 Ohio   Philadelphia N Yd --- --- --- cancelled 21/7/1943
BB69 Maine   New York N Yd, Brooklyn --- --- --- cancelled 21/7/1943
BB70 New Hampshire   New York N Yd, Brooklyn --- --- --- cancelled 21/7/1943
BB71 Louisiana   Norfolk N Yd, Portsmouth --- --- --- cancelled 21/7/1943


Technical data


Displacement standard, t

60500

Displacement full, t

70500

Length, m

271.3 wl 281.9 oa

Breadth, m

36.9

Draught, m

11.2 full load

No of shafts

4

Machinery

4 sets geared steam turbines, 8 boilers

Power, h. p.

172000

Max speed, kts

28

Fuel, t

oil 7300

Endurance, nm(kts)15000 (15)
Armour, mm

belt: 409 - 259 on 25mm plating, lower belt: 183 - 25, main deck: 152 - 187, upper deck: 57, splinter deck: 16 - 19, bulkheads: 457 - 387, barbettes: 457 - 541, turrets: 572 face, 232 crown, 254 sides, 305 rear, CT: 457 sides, 184 roof

Armament

4 x 3 - 406/50 Mk 7, 10 x 2 - 127/54 Mk 16, 8 x 4 - 40/56 Mk 1/2, 20 x 1 - 20/70 Mk 4, 2 catapults, 3 seaplanes (OS2U, SC)

Electronic equipmentpresumably 2x SG, SK-2, 2x Mk 8, 4x Mk 12/22, Mk 27 radars
Complement

2149



Standard scale images


<i>Montana</i>
Montana


Graphics





Ship project history


Relatively slow ships protected against new 406mm shells. At first 457mm guns were considered, later they were replaced by 12 406/50mm (but in quadruple turrets to save a length). Finally ships would had hull form as North Carolinas, four main triple turrets and new 127/54mm secondary guns. As a result new very strong protected and heavy armoured ship can not pass existing locks of Panama Canal, and simultaneously money been appropriated for a 3rd set of locks. 5 ships were authorized under the Act of 19/7/1940 but suspended at Presidential direction in April 1942 owing a steel shortage, new locks of Panama Canal were also cancelled. Finally all five ships were cancelled 21/7/1943.

Ship protection


Main belt, inclined at 19° to vertical, would been 409mm thick (on 25mm STS plating) at upper part tapering to 259mm at lower edge. Belt was connected with end barbettes by 457mm fore and 387mm aft bulkheads. Lower belt, inclined at 10°, had 183mm (abreast machinery)-216mm (abreast magazines) thickness at upper edge tapering to 25mm at lower edge. Flat main armour deck was connected with upper edge of belt and was 147mm (on 57mm plating) over citadel. One level higher there was 38mm upper deck. One level lower there was flat 19-16mm splinter deck. Steering gear had own belt and roof. Main gun turrets had 572mm faces. Fore barbettes over main deck were 572mm at the sides, aft barbettes had up to 457mm protection.