mk1 


     Caliber = 21.0 cm (8.3 inch) 
     Shell weight = 115 kg (253 lbs) 
     Muzzle velocity = 849 m/s (2783 fps) 

     Relative ballistic performance: 0.65 

     Muzzle energy = 41.407 megajoules = 15258.6 foot-tons 

     Relative muzzle energy: 0.84 

     Barrel length: 44 calibers 


     Elevation          Range         Time      Velocity   Fall Angle 

       2.5 deg        4700 meters     7.0 sec    550 m/s     3.4 deg 
       5.0 deg        7600 meters    13.0 sec    426 m/s     7.9 deg 
       7.5 deg        9700 meters    18.5 sec    359 m/s    13.2 deg 
      10.0 deg       11300 meters    23.5 sec    320 m/s    18.7 deg 
      12.5 deg       12700 meters    28.2 sec    296 m/s    24.4 deg 
      15.0 deg       13800 meters    32.6 sec    282 m/s    29.7 deg 
      20.0 deg       15600 meters    41.0 sec    270 m/s    39.7 deg 
      25.0 deg       17000 meters    48.7 sec    270 m/s    47.8 deg 
      30.0 deg       18000 meters    56.1 sec    276 m/s    54.4 deg 
      35.0 deg       18800 meters    63.0 sec    285 m/s    59.5 deg 
      40.0 deg       19200 meters    69.6 sec    294 m/s    63.7 deg 
      45.0 deg       19200 meters    75.9 sec    304 m/s    67.3 deg 
      50.0 deg       18900 meters    81.8 sec    313 m/s    70.3 deg 


          Armor Penetration - Vertical Belt Armor 

               (Relative armor quality, 1.00) 

               Maximum penetration: 38.22 cm 


     Elevation          Range            Belt       Deck 

       1.6 deg        3400 meters        25 cm
       2.9 deg        5300 meters        20 cm
       5.0 deg        7600 meters        15 cm
       7.0 deg        9300 meters         ...        2 cm 
       9.5 deg       11000 meters        10 cm
      17.4 deg       14700 meters         ...        4 cm 
      24.3 deg       16800 meters         5 cm
      27.3 deg       17500 meters         ...        6 cm 
      39.6 deg       19100 meters         ...        8 cm 


     Maximum range = 19200 meters at 43.2 deg elevation