The US Navy has replaced the MK149-2 Phalanx round with a DU penetrator by the MK149-4 Phalanx round with a tungsten penetrator. In 1988 the Navy opted to transition the CIWS 20mm round from DU to tungsten. The Navy made the decision based on live fire tests that showed that tungsten met the Navy's performance requirements while offering reduced probabilities of radiation exposure and environmental impact. It should be noted that the "soft" targets the CIWS was designed to defeat-anti-ship missiles at close range-are far easier to destroy than "hard" targets like tanks. Substantial stocks of DU ammunition delivered prior to that date remain in the inventory.
снаряд с обеднённым ураном сменили на вольфрамовый.
Team: 20mm Ammunition
Height (max): 168mm
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Weight: 253g ==>> Вес 253г(патрона), снаряд 100г
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Projektilgewicht 100 g
https://de.wikipedia.org/wiki/Phalanx_CIWS
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Number Produced: 3M+
Muzzle Velocity (nominal): 3700 f/s ==>> начальная скорость 1127.76м/с
Chamber Pressure (typical): 60,500 psi
Trace (typical): Untraced
http://www.globalsecurity.org/military/systems/munitions/mk149.htm