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German Balkenkreuz

Germany's 4.2-cm leichte Panzerabwehrkanone 41
4.2-cm lePak 41

It was a taper-bore gun went from 40.3 mm to 29.4 mm.1 It was based on the Gerlich principle.1 The rounds would have special flanges that would fold back as the shell went down the barrel.1 This would increase the shells velocity out the end of the barrel.1

Was mounted on the 3.7-cm Pak 35/36 carriage.1

These guns were issued to the German airborne forces.1

  4.2-cm lePak 41
Starting Caliber 1.586"1
40.3 mm1
Emerging Caliber 1.157"1
29.4 mm1
Length of gun 7' 4.6"1
2.25 m1
Length of bore  
Rifling  
Length of rifling  
Weight traveling  
Weight in action 1,234.5 lb1
560 kg1
Elevation -8° to +25°1
Traverse 60°1
Muzzle Velocity 4,150'/sec1
1,265 m/sec1
Range of shell  
Shell weight AP: 0.74 lb1
AP: 0.336 kg1
Armor penetration AP: 2.835" @ 500 yards1
AP: 72 mm @ 455 m1
Breech mechanism  

Sources:

  1. The Encyclopedia of Weapons of World War II, 1998, Chris Bishop
20th Century American Military History Crucial Site