During the first half of 1939 a contract for 1,500 guns was placed in Switzerland. report. The incorporation of the improvements of the FFS in a new anti-aircraft gun produced, in 1938, the Oerlikon SS. hide. In France, Hispano-Suiza manufactured development of the FFS as the Hispano-Suiza HS.7 and This meant it could keep enemy aircraft under fire over longer time spans. 226. Following the attack on Pearl Harbor on 7 December 1941, the existing 1.1" (28 mm) quad mount and .50 caliber machine guns were determined to be inadequate against modern aircraft, and their replacement by 40 mm Bofors and 20 mm Oerlikon weapons was accelerated. The mount had a triangular base with a jack at each leg for levelling the gun. This system permits blowback to be used in far more powerful weapons than normal. Similar German installations of the MG FF were not successful. In API blowback weapons, the firing pin fires the cartridge while the bolt is still traveling forward so that the gas pressure has to overcome the forward momentum of the bolt as well, before it can push it to the rear. It was also used just as effectively against ground targets as it was against low-flying aircraft.[5]. The Flakvierling weapon consisted of quad-mounted 2 cm Flak 38 AA guns with collapsing seats, folding handles, and ammunition racks. Initially the Oerlikon was not looked upon favorably by the Royal Navy as a short-range anti-aircraft gun. Developed in the final days of World War I, Germany sold the rights to a 20 mm caliber cannon to a Swiss firm that eventually became the Oerlikon 20 mm. The Germans fielded the unrelated early 2 cm Flak 28 just after World War I, but the Treaty of Versailles outlawed these weapons and they were sold to Switzerland. Also check if the product actually matches! During World War II, twin and quadruple Oerlikon mounts were developed, both for army and for navy use. Autocannon Short 125mm Gatling Dual 180mm Dual 425mm Quad 800mm Repeating Cannon 150mm Light 220mm Vulcan Dual 650mm Repeating Cannon Hexa 2500mm 200mm 425mm 800mm Artillery Long 250mm Light 650mm 1200mm Quad 3500mm Siege 280mm Howitzer 720mm Howitzer 1400mm Howitzer Hybrid Gallente/Caldari: Blaster Short Light Electron Heavy Electron Electron A handful of corvettes were fitted with the weapon toward the end of the war, but it appeared more commonly on frigates and destroyers at the time. An improved version known as the 1S followed in 1930. It became famous in the naval anti-aircraft role, providing an effective defense at short ranges (in practice up to 1.5 km) at which heavier guns had difficulty tracking a target. These were the principal armament for its Light Anti-Aircraft squadrons in North Africa, the Middle East, Italy, and North Western Europe, until the introduction of the Bofors 40/L60 40mm gun from 1943, although many squadrons retained a mix of guns until the end of World War 2. The water-cooled version was used almost exclusively by the U.S. Navy and Coast Guard. Belt-fed versions of the gun were developed to overcome this limitation. I have to do serious research to obtain accurate information. The Flakvierling four-autocannon anti-aircraft ordnance system, when not mounted into any self-propelled mount, was normally transported on a Sd. I'd like to thank Tu Vu for taping and editing this video. The 20 mm weapons had always had weak development perspectives, often being reconfigured or redesigned just enough to allow the weapons to find use. The effective vertical range was 2,200 metres. For close-range defense Archons are equipped with a 20mm remotely operated chaingun. 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