20 mm/70 Oerlikon 3S (20 mm)

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Single-mount 20 mm/70 Oerlikon 3S on RN Raimondo Montecuccoli

Description

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Vehicles equipped with this weapon

General info

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Available ammunition

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Comparison with analogues

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Usage in battles

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Pros and cons

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History

The Oerlikon 3S is a powerful and effective 20 mm autocannon that served on all sides during World War II. The origin of the Oerlikon goes back to World War I with the Becker M2 20x70RBmm cannon, itself an upgrade to a 19 mm design that was refined by Spandau Arsenal. Seeing limited use on aircraft of the Luftstreitkräfte (Imperial German Air Force), Becker used an advanced primer ignition blowback action to fire at 300 rounds per minute. Germany lost World War I, however, and the terms of the Treaty of Versailles meant that they couldn't continue production of it. The design was sold to the Swiss firm SEMAG in 1919 which produced the heavier 20x100RBmm SEMAG L firing at a rate of 350 rpm, until the firm went under in 1924.

After this event, Oerlikon bought all the rights, parts, and engineers and continued production as the Oerlikon L and in 1927 added the Oerlikon S to their production line. The Oerlikon S fired an even larger 20x110RBmm cartridge at a much higher muzzle velocity but at the cost of a slower rate of fire of 280 rpm. The Oerlikon 3S was a further improved version of the Oerlikon S. The Italians purchased a small number of these guns in 1941. While superior to their own domestically made 20 mm cannons the 20 mm/65 Breda and 20 mm/70 Scotti-Isotta Fraschini mod.1939, it was not made the standard issue naval anti-aircraft gun during World War II.

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See also

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External links

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Italy naval cannons
20 mm  20 mm/65 Breda · 20 mm/70 Oerlikon 3S · 20 mm/70 Scotti-Isotta Fraschini mod.1939
37 mm  37 mm/54 Breda Mod.32 · 37 mm/54 Breda Mod.38 · 37 mm/54 Breda Mod.39
40 mm  40 mm/39 Vickers-Terni mod.1915/1917 · 40 mm/39 Vickers-Terni mod.1915/1917, Modif.1930 · 40 mm/70 Breda-Bofors type 107
65 mm  65 mm/64 Ansaldo-Terni Mod.1939
76 mm  76 mm/40 Armstrong mod.1897/1910 · 76 mm/40 Armstrong mod.1897/1912 · 76 mm/40 Ansaldo mod.1917 · 76 mm/45 Schneider mod.1911 · 76 mm/50 Vickers mod.1909 · 76 mm/62 OTO-Melara Compact · 76-mm/62 SMP 3
90 mm  90 mm/50 Ansaldo model 1939
100 mm  100 mm/47 O.T.O. Mod. 1928 · 100 mm/47 O.T.O. Mod. 1937
120 mm  120 mm/45 Canet-Schneider-Armstrong mod.1918-19 · 120 mm/50 Armstrong model 1909 · 120 mm/45 O.T.O. Mod. 1926 · 120 mm/50 Ansaldo mod.1926 · 120 mm/50 O.T.O. Mod.1936
135 mm  135 mm/45 O.T.O. Mod. 1937
152 mm  152 mm/45 Schneider mod.1911 · 152/53 mm Ansaldo mod.1926 · 152/53 mm O.T.O. Mod.1929
203 mm  203 mm/50 Ansaldo mod.1924 · 203 mm/53 Ansaldo mod.1927
305 mm  305 mm/46 Armstrong model 1909 · 305 mm/46 Vickers model 1909
320 mm  320 mm/44 OTO model 1934 · 320 mm/44 Ansaldo model 1936
  Foreign:
20 mm  2 cm/65 Flakvierling 38 (Germany) · 20 mm/70 Oerlikon Mk.II (USA)
40 mm  Bofors L/60 Mark 1 (USA) · Bofors L/60 Mark 3 (USA)
76 mm  76 mm/50 Mk.33 (USA)
127 mm  127 mm/38 Mk.12 (USA)

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