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In ballistics, the elevation is the angle between the horizontal plane and the axial direction of the barrel of a gun, mortar or heavy artillery.Originally, elevation was a linear measure of how high the gunners had to physically lift the muzzle of a gun up from the gun carriage to compensate for projectile drop and hit targets at a certain distance.
The British Westland Whirlwind (four 20 mm cannon) and the American Lockheed P-38 Lightning (one 20 mm cannon and four .50 cal), both twin-engined fighters, carried the entirety of their gun armament in the nose, a configuration which concentrated the firepower at a broader range of distances, and did not require left–right harmonisation. [4]
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In emergencies, gunners could use the spear blade as a weapon to defend the cannon. [4] Like much early modern military equipment, the linstock could have an additional function; 16th century examples had measurements in inches and a protractor engraved on the blade to allow the gun captain to check the angle. [citation needed]
The basis of the system is the 20 mm M61 Vulcan rotary cannon, used by the United States military on various tactical aircraft since 1959, linked to a K u band fire control radar system for acquiring and tracking targets. This proven system was combined with a purpose-made mounting, capable of fast elevation and traverse speeds, to track ...
In the 1930s, Marc Birkigt designed an entirely new gas-operated cannon with a locked bolt, the HS.404, which became one of the best 20 mm weapons of the war. Ikaria Werke in Germany started production of the FF F with a slightly more powerful 20x80mm round as the MG FF , but later introduced a new mine shell round which was lighter and ...
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It is a positively locked breech, gas and recoil operated cannon with a rotating bolt head and a dual-belt selective feed system taking a 25mm NATO cartridge. The rate of fire in burst mode is up to 600 rounds per minute but it can be adjusted electronically and reduced to single shot or a selectable range from 100 up to 175 rounds per minute.