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Russian 234mm/54
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This gun was to be the main armament of the Sviatoslav class heavy cruisers, until heavy cruiser armament was limited to 210mm by the Treaty of Cleito.  The guns, and their dual and triple turrets, are being incorporated into various Coast Artillery installations.

          Russian 234mm/54

     Caliber = 23.4 cm (9.2 inch)
     Shell weight = 200 kg (441 lbs)
     Muzzle velocity = 868 m/s (2846 fps)
     Relative ballistic performance: 0.90
     Muzzle energy = 75.271 megajoules = 27737.2 foot-tons
     Relative muzzle energy: 1.11
     Barrel length: 54 calibers

     Elevation          Range         Time      Velocity   Fall Angle
       2.5 deg        5600 meters     7.4 sec    666 m/s     3.0 deg
       5.0 deg        9700 meters    14.2 sec    553 m/s     6.8 deg
       7.5 deg       12800 meters    20.4 sec    484 m/s    11.0 deg
      10.0 deg       15500 meters    26.3 sec    438 m/s    15.6 deg
      12.5 deg       17700 meters    32.0 sec    408 m/s    20.4 deg
      15.0 deg       19700 meters    37.3 sec    389 m/s    24.9 deg
      20.0 deg       23000 meters    47.5 sec    370 m/s    33.6 deg
      25.0 deg       25600 meters    57.1 sec    368 m/s    41.2 deg
      30.0 deg       27800 meters    66.3 sec    374 m/s    47.6 deg
      35.0 deg       29500 meters    75.0 sec    385 m/s    52.8 deg
      40.0 deg       30600 meters    83.4 sec    398 m/s    57.2 deg
      45.0 deg       31100 meters    91.3 sec    412 m/s    61.0 deg
      50.0 deg       30900 meters    98.6 sec    425 m/s    64.3 deg

          Armor Penetration - Vertical Belt Armor
               (Relative armor quality, 0.90)
               Maximum penetration: 58.79 cm

     Elevation          Range            Belt       Deck
       1.0 deg        2500 meters        50 cm
       1.8 deg        4200 meters        45 cm
       2.8 deg        6100 meters        40 cm
       3.9 deg        7900 meters         ...        2 cm
       4.0 deg        8200 meters        35 cm
       5.7 deg       10700 meters        30 cm
       7.8 deg       13200 meters         ...        4 cm
       8.3 deg       13700 meters        25 cm
      12.2 deg       17500 meters        20 cm
      13.8 deg       18700 meters         ...        6 cm
      18.7 deg       22200 meters         ...        8 cm
      19.6 deg       22700 meters        15 cm
      23.3 deg       24800 meters         ...       10 cm
      28.1 deg       27000 meters         ...       12 cm
      33.2 deg       28900 meters         ...       14 cm
      36.0 deg       29700 meters        10 cm
      38.6 deg       30300 meters         ...       16 cm
      44.5 deg       31100 meters         ...       18 cm

     Maximum range = 31100 meters at 46.3 deg elevation


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