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本帖最后由 STG44突击步枪 于 2015-4-16 19:43 编辑
6寸炮是垃圾口径
5.4"/48 (13.7 cm) Mark 1
This weapon was part of a 1939 - 1940 study on possible replacements for the 5"/38 (12.7 cm) Mark 12. During this study, a variety of guns were investigated for arming a new generation of destroyers, cruisers and battleships. Requirements for the new weapon included the ability to achieve a slant range of 14,000 yards (12,800 m) and a maximum surface range of at least 18,000 yards (16,500 m). Projectile weight was to be no more than 75 lbs. (34 kg), muzzle velocity not less than 2,700 fps (823 mps) and a rate of fire of not less than 15 rounds per minute at any elevation. Besides the 5.4"/48 (13.7 cm), an up-rated 5"/38 (12.7 cm), a new 5"/54 (12.7 cm) and an improved 6"/47 (15.2 cm) were also considered.
Although the existing 5"/38 (12.7 cm) did not meet any of the above requirements, it did have a significantly lower mounting weight than any of the larger guns. This meant that more of them could be accommodated on the same size ship. For example, BuOrd calculated that a ship capable of carrying eight 5"/38 (12.7 cm) guns could only carry six 5"/54 (12.7 cm) guns and even fewer of the larger calibers. When the increased weight was taken into account, BuOrd could see no advantage to larger calibers and recommended that the planned new ships continue to use the existing 5"/38 (12.7 cm). BuOrd did recommend in January 1940 that development of the 5"/54 (12.7 cm) be pursued as its heavier shell would mean an improved anti-surface capability over the 5"/38 (12.7 cm). This resulted in the 5"/54 (12.7 cm) Mark 16 which was chosen to arm the Montana class (BB-67) battleships and the Midway class (CVB-41) carriers.
As for the 5.4"/48 (13.7 cm), it was temporarily revived as a possible armament for the proposed 8,000 ton cruisers when the new 6"/47 (15.2 cm) failed its preliminary tests, but this fell through when BuOrd reported that it would take at least 30 months just to get the design to the proofing stage. The 5"/54 (12.7 cm) could be produced three to four months quicker, as it could use some of the existing tooling used for the 5"/38 (12.7 cm).
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发表于 2015-4-12 08:44
发表于 2015-4-17 02:04
