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French 1.57"
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This gun is extensively used for light AA.

            French 40mm/60

     Caliber = 4.0 cm (1.6 inch)
     Shell weight = 1 kg (2 lbs)
     Muzzle velocity = 930 m/s (3051 fps)
     Relative ballistic performance: 0.90
     Muzzle energy = 0.433 megajoules = 159.4 foot-tons
     Relative muzzle energy: 1.28
     Barrel length: 60 calibers

     Elevation          Range         Time      Velocity   Fall Angle
       2.5 deg        3500 meters     6.6 sec    344 m/s     4.8 deg
       5.0 deg        4900 meters    11.4 sec    241 m/s    11.8 deg
       7.5 deg        5800 meters    15.5 sec    197 m/s    19.6 deg
      10.0 deg        6400 meters    19.2 sec    176 m/s    27.6 deg
      12.5 deg        6900 meters    22.5 sec    165 m/s    34.8 deg
      15.0 deg        7300 meters    25.6 sec    160 m/s    41.4 deg
      20.0 deg        7800 meters    31.4 sec    159 m/s    52.3 deg
      25.0 deg        8200 meters    36.7 sec    162 m/s    60.3 deg
      30.0 deg        8400 meters    41.6 sec    168 m/s    66.1 deg
      35.0 deg        8500 meters    46.3 sec    173 m/s    70.5 deg
      40.0 deg        8400 meters    50.8 sec    178 m/s    74.0 deg
      45.0 deg        8200 meters    55.0 sec    182 m/s    76.7 deg
      50.0 deg        7900 meters    58.9 sec    185 m/s    78.9 deg

          Armor Penetration - Vertical Belt Armor
               (Relative armor quality, 0.90)
               Maximum penetration: 11.04 cm

     Elevation          Range            Belt       Deck
       1.1 deg        2100 meters         5 cm

     Maximum range = 8500 meters at 35.4 deg elevation
     Maximum elevation = 6690 meters at 85.0 deg elevation


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