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Imperatritsia Maria Class Battleships
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The Imperatritsia Maria Class Battleships are more heavily armored and slower than the Petropavlovsk Class


Imperatrica Maria, laid down 1911
     Length, 166.0 m x Beam, 30.0 m x Depth, 8.3 m
          23754 tonnes normal displacement (21997 tonnes standard)
     Main battery:      12 x 30.5-cm (4 x 3)
     Secondary battery: 18 x 13.0-cm
     QF battery:         4 x  7.6-cm
     Light battery:      4 x  4.7-cm
          Weight of broadside: 5301 kg
     4 TT, 46.0 cm
     Main belt, 30.5 cm; bow and stern, 13.0 cm
     Upper belt, 20.0 cm
     Armor deck, average 11.5 cm
     Conning tower, 30.0 cm
     Battery armor:
          Main, 30.0 cm / secondary, 13.0 cm
          QF, 2.5 cm shields 
     Maximum speed for 23273 shaft kw = 21.00 knots
          Approximate cruising radius, 3000 nm / 16 knots
     Typical complement: 957-1244

                    Estimated cost, $8.554 million (2.139 million)
          Remarks:
     Relative extent of belt armor, 70 percent of 'typical' coverage.
     Ship has slow, easy roll; a good, steady gun platform.
     Good seaboat; rides out heavy weather easily.
     Magazines and engineering spaces are roomy, with superior
     watertight subdivision.
     Ship is roomy, with superior accommodation and working space.
     Main deck secondary guns subject to being washed down
     in a seaway.

          Distribution of weights:
                                                       Percent
                                                       normal
                                                    displacement:
          Armament .........................   1458 tonnes =   6 pct
          Armor, total .....................   8596 tonnes =  36 pct
               Belt                            2556 tonnes =  11 pct
               Deck                            3079 tonnes =  13 pct
               C.T.                             211 tonnes =   1 pct
               Armament                        2750 tonnes =  12 pct
          Machinery ........................   1392 tonnes =   6 pct
          Hull and fittings; equipment .....   9105 tonnes =  38 pct
          Fuel, ammunition, stores .........   3203 tonnes =  13 pct
          Miscellaneous weights ............      0 tonnes =   0 pct
                                              -----
                                              23754 tonnes = 100 pct
          Estimated metacentric height, 1.9 m
     Displacement summary:
          Light ship:             20550 tonnes
          Standard displacement:  21997 tonnes
          Normal service:         23754 tonnes
          Full load:              25064 tonnes
          Loading submergence 3445 tonnes/metre
     +++++++++++++++++++++++++

     Estimated overall survivability and seakeeping ability:
          Relative margin of stability: 1.15
          Shellfire needed to sink: 15561 kg = 39.5 x 30.5-cm shells
               (Approximates weight of penetrating
               shell hits needed to sink ship,
               not counting critical hits)
          Torpedoes needed to sink: 4.1
               (Approximates number of 'typical'
               torpedo hits needed to sink ship)
          Relative steadiness as gun platform, 71 percent
               (50 percent is 'average')
          Relative rocking effect from firing to beam, 0.49
          Relative quality as a seaboat: 1.42
     +++++++++++++++++++++++++

     Hull form characteristics:
          Block coefficient: 0.57
          Sharpness coefficient: 0.43
          Hull speed coefficient 'M' = 5.79
          'Natural speed' for length = 23.3 knots
          Power going to wave formation
               at top speed: 46 percent

     Estimated hull characteristics and strength:
          Relative underwater volume absorbed by
               magazines and engineering spaces: 67 percent
          Relative accommodation and working space: 127 percent

          Displacement factor: 104 percent
               (Displacement relative to loading factors)

          Relative cross-sectional hull strength: 0.98
               (Structure weight per square
               metre of hull surface: 891 kg)
          Relative longitudinal hull strength: 1.78
               (for 5.50 m average freeboard;
               freeboard adjustment +0.01 m)
          Relative composite hull strength: 1.04
     +++++++++++++++++++++++++

[Machine-readable parameters: Spring Style v. 1.2.1]
544.48 x 98.40 x 27.22; 18.04 -- Dimensions
0.57 -- Block coefficient
1911 -- Year laid down
21.00 / 3000 / 16.00; Turbine, coal fired -- Speed / radius / cruise
 0 tons -- Miscellaneous weights
++++++++++
12 x 12.01; 4; 0 -- Main battery; turrets; superfiring
   :
18 x 5.12; 0 -- Secondary battery; turrets
  Main deck battery
   :
4 x 2.99 -- Tertiary (QF/AA) battery
  Gun-shields
   :
4 x 1.85 -- Fourth (light) battery
4 / 0 / 18.11 -- TT / submerged / size
++++++++++
12.01 / 5.12 / 7.87 / 0.00; 70 -- Belt armor; relative extent
4.53 / 11.81 -- Deck / CT
11.81 / 5.12 / 0.98 / 0.00 -- Battery armor

     (Note: For portability, values are stored in Anglo-American units)

     +++++++++++++++++++++++++++++++++++++++++++++++++++++++


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