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Short-barrel firearms such as handguns necessitate faster-burning propellants to obtain sufficient muzzle energy, while long guns typically use slower-burning propellants. The pressure relationships between propellant chemical reactions and bullet response are described as internal ballistics .
The vehicle carries 344 rounds for the main gun, 200 rounds are for 'ready use' while 144 are kept in storage. 2,300 rounds are carried for the machine gun. The gun is moved in the horizontal and vertical planes by an electromechanical system, it can also be moved manually. The gun can be depressed or elevated between −7° and +44°.
Large guns use polyurethane jackets over the powder bags. [ 25 ] Other additives include ethyl acetate (a solvent for manufacture of spherical powder), rosin (a surfactant to hold the grain shape of spherical powder) and graphite (a lubricant to cover the grains and prevent them from sticking together, and to dissipate static electricity ).
Front cover – The M16A1 Rifle – Operation and Preventive Maintenance by Will Eisner, issued to American soldiers in the Vietnam War. An inadequately maintained firearm will often accumulate excessive fouling and dirt within the barrel and receiver, which not only can clog up the rifling and decrease the firearm's accuracy and precision, but can also interfere with the proper operation of ...
In early black powder guns such as muzzleloaders, the primer was essentially the same chemical as the main propellant (albeit usually in a finer-powdered form), but poured into an external flash pan, where it could be ignited by an ignition source such as a slow match or a flintlock, though some muzzleloaders have primers like cap gun caps ...
Black powder substitutes are measured by volumetric measurement techniques, not in grains on a scale, due to the difference in density compared to black powder. For example, to measure a "60 grain equivalent" of black powder substitute suitable for use in a muzzleloader rifle, one uses a volumetric measure that produces a volume of black powder ...
Armed BT-9 with one cowl gun and one rear flexible gun, and modified canopy. 40 built. BT-9B Minor changes from BT-9, unarmed. 117 built. 1 modified as sole BT-9D which was modified as a prototype for BT-14 with new outer wing panels and other alterations. BT-9C Wright R-975-7, similar to the BT-9A with minor changes. 66 built BT-9D
Also known as bunker fuel, or residual fuel oil, HFO is the result or remnant from the distillation and cracking process of petroleum. For this reason, HFO contains several different compounds that include aromatics , sulfur , and nitrogen , making emissions upon combustion more polluting compared to other fuel oils. [ 1 ]