Free recoil is a vernacular term or jargon for recoil energy of a firearm not supported from behind. Free recoil denotes the translational kinetic energy (Et) imparted to the shooter of a small arm when discharged and is expressed in joule (J) and foot-pound force (ft·lbf) for non-SI units of measure. More generally, the term refers to the recoil of a free-standing firearm, in contrast to a firearm securely bolted to or braced by a massive mount or wall.
Free recoil should not be confused with recoil. Free recoil is the given name for the translational kinetic energy transmitted from a small arm to a shooter. Recoil is a name given for conservation of momentum as it generally applies to an everyday event.
Free recoil, sometimes called recoil energy, is a byproduct of the propulsive force from the powder charge held within a firearm chamber (metallic cartridge firearm) or breech (black powder firearm). The physical event of free recoil occurs when a powder charge is detonated within a firearm, resulting in the conversion of chemical energy held within the powder charge into thermodynamic energy. This energy is then transferred to the base of the bullet and to the rear of the cartridge or breech, propelling the firearm rearward into the shooter while the projectile is propelled forward down the barrel, with increasing velocity, to the muzzle. The rearward energy of the firearm can be when calculated is the free recoil and the forward energy of the bullet when calculated and is the muzzle energy.
The concept of free recoil comes from the tolerability of gross recoil energy. Trying to figure the net recoil energy of a firearm (also known as felt recoil) is a futile endeavor. Even if you can calculate the recoil energy loss due to: muzzle brake; recoil operated action or gas operated action; mercury recoil suppression tube; recoil reducing butt pad and or hand grip; shooting vest and or gloves, the human factor is not calculable.
Therefore, free recoil stands as a scientific measurement of recoil energy, just as the room or outside temperature is measured. The comfort level of a shooter’s ability to tolerate free recoil is a personal perception. Just as it is a person's, personal perception of how comfortable he or she feels to room or outside temperature.
There are many factors that determine how a shooter will perceive the free recoil of his or her small arm. Some of the factors are, but not limited to: body mass; body frame; experience; shooting position; recoil suppression equipment; small arm fit and or environmental stressors.
Other articles related to "recoil, free recoil, free":
... The M16's straight-line recoil design, direct impingement gas operation system and smaller caliber gives it less recoil than the AK-47 and makes it easier ... The M16's straight-line recoil design, where the recoil spring is located in the stock directly behind the action, and serves the dual function of operating spring and recoil buffer ... Because recoil does not significantly shift the point of aim, faster follow-up shots are possible and user fatigue is reduced ...
... (ft/s) Powder charge mass-g (gr) Free recoil J (ft·lbf) Shilo Sharps 1874/5.4 (12) Government.45-70/27.2 PP (420 PP) 428 (1403) 4.9 (75) 17.9 13.2 ...
... lexicon, the energy of a recoiling firearm is called felt recoil, free recoil, and recoil energy ... Again assuming free-recoil conditions and assuming all forward momentum is due to the projectile, the energy of the projectile will be and the energy of the firearm due to recoil will be. 5 pounds firing a 150 grain bullet, the recoil energy will be only 0.43 percent of the total kinetic energy developed ...
... Recoil is explained by the law of conservation of momentum, and so it is easier to discuss it separately from energy ... The nature of the recoil process is determined by the force of the expanding gases in the barrel upon the gun (recoil force), which is equal and ... It is also determined by the counter-recoil force applied to the gun (e.g ...
Famous quotes containing the words recoil and/or free:
“A man with your experience in affairs must have seen cause to appreciate the futility of opposition to the moral sentiment. However feeble the sufferer and however great the oppressor, it is in the nature of things that the blow should recoil upon the aggressor. For God is in the sentiment, and it cannot be withstood.”
—Ralph Waldo Emerson (18031882)
“There is no such thing as a free lunch.”
An axiom from economics popular in the 1960s, the words have no known source, though have been dated to the 1840s, when they were used in saloons where snacks were offered to customers. Ascribed to an Italian immigrant outside Grand Central Station, New York, in Alistair Cookes America (epilogue, 1973)