Posted by mooger on April 01, 2014 at 20:38:02 from (69.35.177.184):
bill mart wrote:
"Found this on the net, can anyone explain the caliber part any simpler? Bill
"Explanation of the term Caliber in relation to Naval Rifles[edit]
Naval rifles, although constructed and manufactured in roughly the same manners as land-based artillery, were built to much more stringent and studious standards than land-based weapons, and for good reason. At sea, a weapon had to perform, without fail. There was no ready replacement, nor one that could be readily supplied. Additionally, naval artillery reached sizes and weights virtually unheard of (with a few very rare exceptions) in land-based weapons. Over time, the terms of pound (weight of shell) and bore (the actual bore of the weapon) became confused and blurred. Eventually, when the technology existed, the bore (in inches or millimetres) came to be the standard measure. For naval rifles, the initial change was to actual bore, thus facilitating the manufacture of standard projectiles. Concurrently the practice of presenting the measure of the effective length (and therefore range) of the weapon in calibers began to emerge. These were (and are) a measure of the standardized bore of the barrel versus the rifled bore of the barrel. In other words, a 12/45 is 12"X45= the length of the rifled bore of that gun in inches. This explains the differences in both penetration and long range performance of various naval rifles over the years, as a gun of 12/35 versus a 12/50 in most instances will, when presented without range or penetration data, appear to be nearly the same weapon. In addition to the possible improvements in overall performance (i.e. muzzle velocity and striking force), the increase in barrel length also allowed, in some circumstances, an increase in projectile size as well. For example, the American 14/45, as introduced in the New York-class ships, fired a 1250 lb projectile. Later improvements to the design, lengthening the rifle itself and also altering the breech, allowed a 1400 lb projectile and, overall, a greater barrel life. Again we see this pattern with the US 16-inch guns. The initial design was 45 calibers in length and fired a 2200 lb shell. The later re-design to 50 calibre not only allowed a higher velocity but also a heavier 2700 lb shell, which ultimately came to be accepted as the greatest naval shell ever deployed in combat."
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The starting point is the bore diameter, or what is usually called "caliber."
The bore length of larger guns is sometimes described as a multiple of the bore diameter.
A gun with a 16-inch bore that has a bore length of 45 calibers is 720 inches long (16 multiplied by 45).
Dunno if that helps.
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This post was made to the full discussion/thread, not as a stand-alone post/new topic. It appears within the discussion in Modern View
This post was edited by mooger at 20:50:21 04/01/14.
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