Life of guns

Life of Guns. See under Erosion of Gun Barrels in Encycl 5 (1972), E112-R to E120-R... 

Service Life. Use age of the unit at the time of retirement. See also under Life of Guns in Vol 7, L14-L... 

The procedures used for estimating the service life of solid rocket and gun propulsion systems include physical and chemical tests after storage at elevated temperatures under simulated field conditions, modeling and simulation of propellant strains and bond tine characteristics, measurements of stabilizer content, periodic surveillance tests of systems received after storage in the field, and extrapolation of the service life from the detailed data obtained (21—33). 

Carey McWilliams, an architect of the nation of nations tradition in American social thought, stands out for his refusal to ldse sight of the overall complexity of the American mosaic and for his refusal to make race identical with the Negro in American political life. Unlike Gun-nar Myrdal and other social scientists, who would effectively expel from consideration those pegged neither as white nor as black, McWilliams demonstrated a keen sensitivity to the complex racial tableau in... 

Quigley, Paxton. Armed and Female. New York E. P. Dutton, 1989. A combination of gun advocacy and a how to manual for women who want to obtain a gun for self-defense. Quigley covers both practical and legal considerations for gun use and includes real-life accounts of crime incidents to illustrate tactical problems. 

It was claimed by the Russians that "prossal nik increased the life of the guns, but accdg to some American sources, the use of bore lubrication decreased the muzzle velociry... 

When used in anti-aircraft guns, this proplnt increased the barrel life of a gun from 1700 firings (as experienced with NG proplnts with a calorific value of 950 cal) to about 15000 firings (Ref 8, p 88)... 

Gun Life Factor (GLF) (British). If the useful life of a gun using Cordite MD(MC)... 

The shelf-life of propellants is evaluated from the stabilizer content and is defined by the period of storage (number of years) in which the stabilizer content is reduced to half of the initial value. Gun propellants of low web size <0.2 mm can burn very fast which may lead to mass detonation and accordingly gun propellants with low web size fall under UN Hazard Classification 1.1 whereas others fall under 1.3 (see Chapter 6). 

We are not giving here the description of Ger double-base proplnts contg NG because there was nothing unusual about them and many were similar to US proplnts The description given below will be devoted to the problem of gun barrel erosion caused by NC-NG proplnts and to the development in Geimany, before WWII, of a new class of proplnts which reduced the erosion to such.an extent that the serviceable life of a barrel increased 4—5 times in comparison with NC-NG proplnts... 

This meant that reduction of 130kcal/kg in calorific value, doubled (approximately) the life of the barrel. No further improvement in life of AA guns could be obtd when using NC-NG proplnts (Refs 1 2 and Ref 4, p Ger 43, under Erosion of the Bore)... 

In calculating the life of a gun barrel, it was considered in Germany to relate to the "effective calorific value , more than to the values obed in a calorific bomh (See also under " Energy Content of a Propellant Charge" and under "Erosion of the Bore")... 

Erosion is increased and life of a gun is decreased with increase of propelling charge and increase in caliber of gun... 

The official name for the Welrod was Hand Firing Device Mark I, and it was also tried in 9rmn (0.3S4 inch) Parabellum and 0.4S inch (11.4mm) ACP. There were difficulties with both of these. The barrel was very short in the 9mm version, and inside the silencer was a perforated steel tube which dissipated the muzzle gases into the larger space of the silencer casing. The bullet was thus robbed of some propulsive force and left the other end of the silencer at below the speed of sound. The gas then followed it via a rubber disc, which slowed it down sufficiently to make sure that there was no noise. Despite the ingenuity the life of the silencers was short, and both the 9mm and the 0.45 inch ammo were too powerful for the little gun Ref B. Fitzsimons, Ed, The Illustrated Encyclopedia of 20th Century Weapons and Warfare , Vol 24, Purnell Reference Books, Milwaukee (1979), 2591... 

It possesses, however, the following advantages over a gun a)Its lighter and shorter barrel permits throwing a heavier projectile than a gun of equal wt b)Its proplnt chge is not as heavy and is more flexible, and c)The life of a howitzer is much longer than that of a gun of equal caliber... 

It was claimed by the Russians that the use of prossal nik increased the life of the gun (Ref 1), but according to US sources (Ref 2), the use of bore lubrication decreased the muzzle velocity. When oil was used as a lubricant, the muzzle velocity of the first round was practically the same as in the gun previously cleaned and dried, but velocities of the 2nd, 3rd, etc rounds were appreciably lower. After firing a number of rounds (number not stated) the muzzle velocity started to climb back to that obtained when firing was conducted in a gun not previously lubricated (Ref 2)... 

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