Mk1 


     Caliber = 27.5 cm (10.8 inch) 
     Shell weight = 260 kg (573 lbs) 
     Muzzle velocity = 655 m/s (2149 fps) 

     Relative ballistic performance: 0.80 

     Muzzle energy = 55.808 megajoules = 20565.3 foot-tons 

     Relative muzzle energy: 0.51 

     Barrel length: 30 calibers 


     Elevation          Range         Time      Velocity   Fall Angle 

       2.5 deg        3400 meters     5.7 sec    541 m/s     2.9 deg 
       5.0 deg        6000 meters    11.0 sec    468 m/s     6.3 deg 
       7.5 deg        8200 meters    16.0 sec    418 m/s    10.2 deg 
      10.0 deg       10000 meters    20.7 sec    383 m/s    14.2 deg 
      12.5 deg       11600 meters    25.3 sec    357 m/s    18.6 deg 
      15.0 deg       12900 meters    29.7 sec    340 m/s    23.0 deg 
      20.0 deg       15200 meters    37.9 sec    321 m/s    31.3 deg 
      25.0 deg       16900 meters    45.7 sec    315 m/s    39.0 deg 
      30.0 deg       18300 meters    53.0 sec    317 m/s    45.6 deg 
      35.0 deg       19200 meters    59.9 sec    323 m/s    51.3 deg 
      40.0 deg       19700 meters    66.4 sec    331 m/s    56.1 deg 
      45.0 deg       19800 meters    72.5 sec    341 m/s    60.3 deg 
      50.0 deg       19500 meters    78.2 sec    350 m/s    64.1 deg 


          Armor Penetration - Vertical Belt Armor 

               (Relative armor quality, 1.00) 

               Maximum penetration: 35.61 cm 


     Elevation          Range            Belt       Deck 

       1.6 deg        2200 meters        30 cm
       3.6 deg        4600 meters        25 cm
       5.9 deg        6800 meters         ...        2 cm 
       6.8 deg        7600 meters        20 cm
      12.2 deg       11400 meters        15 cm
      13.1 deg       11900 meters         ...        4 cm 
      20.9 deg       15500 meters         ...        6 cm 
      23.6 deg       16500 meters        10 cm
      27.8 deg       17700 meters         ...        8 cm 
      35.3 deg       19200 meters         ...       10 cm 
      43.5 deg       19800 meters         ...       12 cm 


     Maximum range = 19800 meters at 43.8 deg elevation