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Britain - Oerlikon 20mm L/70

Showing the details of the shells used(where known)
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Weapon Details
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Oerlikon 20mm L/70
(Anti Aircraft)
Blank
photo of Oerlikon 20mm L/70 from Wikipedia
History
Maufactured in Switzerland the first British imports arrived in 1940, and subsequently manufactured under licence in Ruislip London later in 1940. Two versions were manufactured with different barrel lengths L/70 and L/85 which gave muzzle velocities of 820m/sec L70 and 1050m/sec L/85. The L/70 could deliver shells at 450rpm and the L/85 at 900-1000 rpm.
Manufactured1940 - Present
Calibre20mm
LengthL/70
 
20x110RB L/70(AP)
20mm 0.12Kg 820M/Sec
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.13 0.27 0.62 1.63
Penetration(mm@30°) 13 11 8 5
Penetration(mm@0°) 16 13 10 6
Hit Probability(%) 98 98 98 81

Vehicles in our database using this gun
Vehicle NameCommon Name
 Cruiser Mk VICrusader III AA MkII 
 Cruiser Mk VICrusader III AA MkIII 
 

Hit probability is based on a static 2 x 2.4 metre panel at 0 degrees(vertical) at the range specified.

The data that has been used to create these records has come from Wikipedia, The Lone Sentry, The Bundes Archive and numerous books and websites that have provided the detailed information that has not been available anywhere else. The information we use to calculate the penetration tables, flight times and the hit probability comes from the Gun Calibre, the Shell Mass(Kg) and the muzzle velocity, plus range reductions to allow for gravity and wind resistance. This calculation originally came from a pre-war Krupp calculation which has been modified, and seems to fit the actual test results.

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