Britain Oerlikon 20mm L/70

Showing the details of the shells used(where known)   Tweet Weapon Details Oerlikon 20mm L/70 (Anti Aircraft) History Manufactured 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. Manufactured 1940 - Present Calibre 20mm Length L/70 20x101RB (HE High Explosive) 20mm 0.13Kg 750M/Sec ≈0.02Kg explosive Maximum Range 914 Mtr Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.14 0.3 0.67 1.79 4 Direct Fire Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.14 0.3 0.67 1.79 4 10.95 Hit Probability(%) 98 98 98 77 22 0 Blast/Fragmentation Effects Burst radius Infantry in open 99% kill 1 mtr Burst radius Infantry in open 66% kill 2 mtr Burst radius Infantry in open 33% kill 7 mtr  Armour Penetration inc roof at 1 mtr 0 mm An explosion within 1 mtr of infantry in the open will cause 99% casualties - lethal. An explosion within 2 mtr of infantry in the open will cause > 66% casualties and could damage some AFV's. An explosion within 7 mtr of infantry in the open will cause 33% casualties. The blast effect of this shell exploding within 1 mtr of an armoured vehicle will not cause any significant armour damage. Vehicles in our database using this gun Vehicle Name Common Name   Cruiser Mk VI Crusader III AA MkII     Cruiser Mk VI Crusader 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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