mk1 


     Caliber = 12.0 cm (4.7 inch) 
     Shell weight = 28 kg (62 lbs) 
     Muzzle velocity = 913 m/s (2996 fps) 

     Relative ballistic performance: 1.05 

     Muzzle energy = 11.682 megajoules = 4304.8 foot-tons 

     Relative muzzle energy: 1.28 

     Barrel length: 60 calibers 


     Elevation          Range         Time      Velocity   Fall Angle 

       2.5 deg        5500 meters     7.6 sec    598 m/s     3.4 deg 
       5.0 deg        8900 meters    14.1 sec    467 m/s     7.8 deg 
       7.5 deg       11400 meters    20.0 sec    395 m/s    13.0 deg 
      10.0 deg       13400 meters    25.5 sec    352 m/s    18.5 deg 
      12.5 deg       15000 meters    30.6 sec    326 m/s    24.0 deg 
      15.0 deg       16400 meters    35.5 sec    311 m/s    29.4 deg 
      20.0 deg       18700 meters    44.6 sec    298 m/s    39.0 deg 
      25.0 deg       20500 meters    53.2 sec    299 m/s    47.0 deg 
      30.0 deg       21900 meters    61.3 sec    306 m/s    53.3 deg 
      35.0 deg       22900 meters    69.0 sec    316 m/s    58.4 deg 
      40.0 deg       23500 meters    76.4 sec    328 m/s    62.6 deg 
      45.0 deg       23700 meters    83.5 sec    339 m/s    66.1 deg 
      50.0 deg       23500 meters    90.1 sec    349 m/s    69.1 deg 


          Armor Penetration - Belt Inclined 45 degrees 

               (Relative armor quality, 1.00) 

               Maximum penetration: 18.13 cm 


     Elevation          Range            Belt       Deck 

       2.3 deg        5100 meters        10 cm
       6.1 deg       10200 meters         5 cm
      10.3 deg       13600 meters         ...        2 cm 
      23.3 deg       19900 meters         ...        4 cm 
      37.8 deg       23300 meters         ...        6 cm 


     Maximum range = 23700 meters at 44.8 deg elevation