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Free recoil / Frecoil is a vernacular term or jargon for recoil energy of a firearm not supported from behind. Free recoil denotes the translational kinetic energy ( E t ) imparted to the shooter of a small arm when discharged and is expressed in joules (J), or foot-pound force (ft·lb f ) for non-SI units of measure.
For a gun firing under free-recoil conditions, the force on the gun may not only force the gun backwards, but may also cause it to rotate about its center of mass or recoil mount. This is particularly true of older firearms, such as the classic Kentucky rifle , where the butt stock angles down significantly lower than the barrel, providing a ...
Recoil operation is an operating mechanism used to ... Note that the shotgun must be free to recoil for this to work—the compressibility of the shooter's body is ...
Notes: Free recoil is calculated by using the rifle weight, bullet weight, muzzle velocity, and charge weight. [111] It is that which would be measured if the rifle were fired suspended from strings, free to recoil. [111] A rifle's perceived recoil is also dependent on many other factors which are not readily quantified. [111]
From a thermodynamic point of view, a firearm is a special type of piston engine, or in general heat engine where the bullet has a function of a piston. The energy conversion efficiency of a firearm strongly depends on its construction, especially on its caliber and barrel length.
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With short-range rifles and the lower-recoiling long-range rifles, many competitors shoot "free recoil," where the rifle is not touched at all, save for the finger on the trigger. The sandbags provide all the support. By allowing the rifle to move freely backward, the shooter hopes that the movement under recoil will be as consistent as possible.
Notes: Free Recoil is a mathematical equation calculated by using the rifle weight, bullet weight, muzzle velocity and charge weight. [155] It is that which would be measured if the rifle were fired suspended from strings, free to recoil. [155]