mk1 


     Caliber = 30.5 cm (12.0 inch) 
     Shell weight = 395 kg (871 lbs) 
     Muzzle velocity = 814 m/s (2668 fps) 

     Relative ballistic performance: 0.75 

     Muzzle energy = 130.7 megajoules = 48168.8 foot-tons 

     Relative muzzle energy: 0.87 

     Barrel length: 45 calibers 


     Elevation          Range         Time      Velocity   Fall Angle 

       2.5 deg        5000 meters     7.0 sec    637 m/s     3.0 deg 
       5.0 deg        8700 meters    13.4 sec    535 m/s     6.7 deg 
       7.5 deg       11600 meters    19.4 sec    470 m/s    10.9 deg 
      10.0 deg       14100 meters    25.0 sec    427 m/s    15.3 deg 
      12.5 deg       16200 meters    30.4 sec    398 m/s    19.9 deg 
      15.0 deg       18000 meters    35.5 sec    379 m/s    24.4 deg 
      20.0 deg       21000 meters    45.2 sec    360 m/s    33.0 deg 
      25.0 deg       23400 meters    54.4 sec    356 m/s    40.7 deg 
      30.0 deg       25400 meters    63.1 sec    361 m/s    47.1 deg 
      35.0 deg       26800 meters    71.4 sec    371 m/s    52.4 deg 
      40.0 deg       27700 meters    79.3 sec    383 m/s    57.0 deg 
      45.0 deg       28100 meters    86.7 sec    396 m/s    60.8 deg 
      50.0 deg       27900 meters    93.7 sec    408 m/s    64.3 deg 


          Armor Penetration - Vertical Belt Armor 

               (Relative armor quality, 1.00) 

               Maximum penetration: 56.63 cm 


     Elevation          Range            Belt       Deck 

       1.7 deg        3500 meters        45 cm
       2.7 deg        5300 meters        40 cm
       4.0 deg        7300 meters         ...        2 cm 
       4.0 deg        7400 meters        35 cm
       5.9 deg        9800 meters        30 cm
       7.9 deg       12100 meters         ...        4 cm 
       8.5 deg       12600 meters        25 cm
      12.7 deg       16300 meters        20 cm
      13.9 deg       17200 meters         ...        6 cm 
      18.9 deg       20400 meters         ...        8 cm 
      20.2 deg       21100 meters        15 cm
      23.5 deg       22700 meters         ...       10 cm 
      28.4 deg       24800 meters         ...       12 cm 
      33.5 deg       26400 meters         ...       14 cm 
      36.3 deg       27100 meters        10 cm
      39.0 deg       27600 meters         ...       16 cm 
      44.8 deg       28100 meters         ...       18 cm 


     Maximum range = 28100 meters at 45.6 deg elevation