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3-50 - DokuWiki

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3-50 [2009/08/31 12:19]
historian
3-50 [2011/01/02 15:15] (current)
historian
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 ====== Twin 3"/50 Anti-Aircraft Gun ====== ====== Twin 3"/50 Anti-Aircraft Gun ======
 +<box 310px left round blue> ​ {{:​3-50gun.jpg?​280x385|}} ​ </​box>​
  
 ###In 1944-1945, the USN found that their 20 mm Oerlikons and 40 mm Bofors batteries were ineffective in stopping Japanese Kamikaze attacks. Only the 5"/38 (12.7 cm) fired a round large enough to destroy a determined attacker and this weapon was too heavy to use in the numbers necessary. This problem led to an accelerated program to develop an intermediate-caliber weapon that could fire a VT fuzed shell. ###In 1944-1945, the USN found that their 20 mm Oerlikons and 40 mm Bofors batteries were ineffective in stopping Japanese Kamikaze attacks. Only the 5"/38 (12.7 cm) fired a round large enough to destroy a determined attacker and this weapon was too heavy to use in the numbers necessary. This problem led to an accelerated program to develop an intermediate-caliber weapon that could fire a VT fuzed shell.
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 Dimensionally,​ the new twin 3"/50 (7.62 cm) mounting was the same size as the quad 40 mm Bofors mounting, although it weighed a bit more. The additional weight meant that these guns replaced the Bofors guns on a one for three basis, rather than the originally intended one for two basis. Ammunition was loaded from each side into the auto-loader. The sprockets turned intermittently,​ transporting the rounds to a loading tray, which swung down to be in line with the breech where a rammer then catapulted the rounds directly into the firing-chamber,​ with the breech-closing mechanism being triggered by the edge of the cartridge case as it tripped one of the ejectors. Effectively,​ the auto-loader simply replaced the crewmen whose job it was to push shells into the breech. The auto-loader is synchronized with the rhythm of the recoil motion, so that new rounds are ready to be rammed at the instant that the previous cartridge is ejected. Ballistically,​ the new automatic weapon had the same characteristics as the older weapon, although the higher rate of fire did result in a shorter barrel life.### Dimensionally,​ the new twin 3"/50 (7.62 cm) mounting was the same size as the quad 40 mm Bofors mounting, although it weighed a bit more. The additional weight meant that these guns replaced the Bofors guns on a one for three basis, rather than the originally intended one for two basis. Ammunition was loaded from each side into the auto-loader. The sprockets turned intermittently,​ transporting the rounds to a loading tray, which swung down to be in line with the breech where a rammer then catapulted the rounds directly into the firing-chamber,​ with the breech-closing mechanism being triggered by the edge of the cartridge case as it tripped one of the ejectors. Effectively,​ the auto-loader simply replaced the crewmen whose job it was to push shells into the breech. The auto-loader is synchronized with the rhythm of the recoil motion, so that new rounds are ready to be rammed at the instant that the previous cartridge is ejected. Ballistically,​ the new automatic weapon had the same characteristics as the older weapon, although the higher rate of fire did result in a shorter barrel life.###
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 ===== References ===== ===== References =====
  
-{{http://​www.navweaps.com|NavWeaps Web Site}}+{{http://​www.navweaps.com/​Weapons/​WNUS_3-50_mk27-33-34.htm|NavWeaps Web Site}}