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Pyramyd air muzzle energy calculator11/18/2023 In Germany airsoft guns with a muzzle energy of no more than 0.5 J are exempt from the gun law, while air guns with a muzzle energy of no more than 7.5 J may be acquired without a firearms license. Namibia specifies three levels of minimum muzzle energy for hunting, 1350 J for game such as springbok, 2700 J for game such as hartebeest and 5400 J for big game, together with a minimum caliber of 7 mm. For example, in Denmark rifle ammunition used for hunting the largest types of game there such as red deer must have a kinetic energy E 100 (i.e.: at 100 m range) of at least 2700 J and a bullet mass of at least 9 g or alternatively an E 100 of at least 2000 J and a bullet mass of at least 10 g. Some jurisdictions also stipulate minimum muzzle energies for safe hunting. Firearms regulation in the United Kingdom is a complicated example, but is demarked by muzzle energy as well as barrel length and ammunition diameter. Overview of gun laws by nation indicates the various approaches taken. In general guns that have the potential to be more dangerous have tighter controls, while those of minimal energy, such as small air pistols or air rifles, require little more than user registration, or in some countries have no restrictions at all. Many parts of the world use muzzle energy to classify guns into categories that require different categories of licence. Typical muzzle energies of common firearms and cartridges In the SI system the above E k will be in unit joule if the mass, m, is in kilogram, and the speed, v, is in metre per second. For a constant velocity, if the mass is doubled, the energy is doubled however, for a constant mass, if the velocity is doubled, the muzzle energy increases four times. The velocity of the bullet is a more important determinant of muzzle energy. V is the velocity of the bullet m is the mass of the bullet.Īlthough both mass and velocity contribute to the muzzle energy, the muzzle energy is proportional to the mass while proportional to the square of the velocity. The general formula for the kinetic energy isĮ k = 1 2 m v 2 The heavier the bullet and especially the faster it moves, the higher its muzzle energy and the more damage it will do. Without consideration of factors such as aerodynamics and gravity for the sake of comparison, muzzle energy is used as a rough indication of the destructive potential of a given firearm or cartridge. Muzzle energy is the kinetic energy of a bullet as it is expelled from the muzzle of a firearm. Pellet exiting muzzle, with formula for energy overlaid. JSTOR ( December 2009) ( Learn how and when to remove this template message). Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. The difference does not matter which ever constant is used for the FPE calculation.This article needs additional citations for verification. The constant 450240 or 450436.7 depends on which value you use for the velocity of gravity, 32.16 ft/s/s or 32.17405 ft/s/s. To convert FPE to Joules multiply by 1.3558, Joules x. Note, PF has little if any meaning for pellet guns and should be ignored. PF = Power Factor, pellet weight x FPS divide by 1000 = PF. FPS = Feet Per Second, FPE = Foot Pounds of Energy.
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