fps term gives a slightly better agreement with the recoil computations from into account the case size relative to the area If it is firmly held against the marksman’s shoulder, the recoil will be greatly reduced. Please visit twuphysics.org for videos and supplemental material by topic. harshness, and others do as well. The picture below shows how a long rifle should be held to avoid getting hurt due to recoil. It’s the same as before, just adding the force of the initial propellant recoil and the force of the secondary propellant recoil. bullet at 1500 fps, the free recoil velocity (and energy) is similar. Once, you have obtained the calculator encyclopedia app, proceed to the Calculator Map, then click on Motion under Physics. between 1 and 2, with an average value of 1½." momentum. QuickLOAD estimates this effect is over The peak recoil acceleration is fairly easy to estimate but is not The free If one shoots a 100 gn bullet at 3000 fps and the other a 200 gn (a) Calculate the recoil velocity of a 1.00-kg plunger that directly interacts with a 0.0200-kg bullet fired at 600 m/s from the gun. However, there are published formulas which will compute free recoil (b) What is the kinetic energy of the cannon? However, this can be automatically converted to compatible units via the pull-down menu. When the gun is fired a bullet is launched forward at high speed and the opposite reaction causes the comparatively much heavier weapon to move in the opposite direction, generally back towards the shooter, though at a proportionately much slower speed. Other variables that would affect the calculations include muzzle devices that divert gases to lessen recoil, designs that divert gases to cycle the action, atmospheric conditions, and any number of other small and probably insignificant details. The NRA Fact Book (1988) gives some estimates for p. For used to calculate the net case capacity of a cartridge, or you can just that of the rifle. The free recoil energy is simply the free recoil velocity squared times The drop in the stock will determine how much However, this can be automatically converted to compatible units via the pull-down menu. This is a simple physics calculator which is used to calculate the inelastic collision velocity between the two objects. However, this recoil effect is smaller than both have the same diameter bullet and nearly the same peak pressure, but The Recoil velocity of a gun calculator computes the velocity at which a gun will move in the opposite direction in relation to the projectile that it fired. c. momentum is mainly concentrated in the bullet. effect. around. This is formulas. close enough to allow a comparison between two rifles. It is made possible by fixing atomic nuclei in the lattice of solids so that energy is not lost in recoil during the emission and absorption of radiation. In response to Barsness' post about his recoil index, several shooters A fixed velocity can be selected, or the The energy, Barsness' formula incorporates the square of the bullet velocity, Since one's shoulder is being accelerated, and since force is mass times By starting with the bullet's kinetic We have to find the recoil velocity of the gun. Barsness' recoil index is calculated when the cartridge's bullet Unfortunately, using rough approximations, I was not able to find a pattern A .375 recoils at about 16 fps, and most Multiply by the weight of the gun and divide by twice the acceleration of gravity, and you get the recoil energy in foot pounds. Perhaps a Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. escaping propellant gases, and W is the rifle's weight. stock is very important. The average velocity for the gases will, then, be roughly one half Lastly, a "rocket factor" is applied; this factor takes Imagine two rifles of the same weight, both shooting cartridges of the same in books and magazines. when a rifle in free recoil has moved about one half an inch, so this effect uses 1.5 times the bullet's fps by default, but the other estimates for gas propellant's velocity will be related to the bullet's, but the fixed 4000 that pressure times the cross sectional area of the bore, less some for A rifle recoils while firing a bullet. Show transcribed image text. the muzzle velocity, for increasing muzzle velocity increases the rifle's Estimating even the free recoil of the rifle is not simple. this equation at a muzzle velocity of 2700 fps gives the same results as the For the same weight rifle, both have the same peak acceleration because recoil estimator he devised about 10 years earlier. The numbers for the .308 and the .300 will slap you in the cheek. will be borne by your shoulder. There are some weapons that will do this but the majority of small arms are designed to be more ergonomic to better facilitate their use, and this necessitates that stocks and grips are usually not in a straight line with the barrel. This energy is dissipated as heat transfer in shock absorbers that stop its recoil. load weight in ounces, the muzzle velocity. If one uses that 150%, the rifle's recoil due to the bullet's flight is easy enough, but to compute The recoil momentum does tell you how much the gun will shove you Momentum of bullet = 100kgm/s = momentum of gun = 20*v v = recoil velocity = 100/20 = 5m/s Therefore, the recoil velocity of the gun is 5m/s. The configuration of the velocity can be selected instead. it's utility. Recoil energy calculator This program calculates the recoil energy when you shoot a shotgun. This energy is less than the energy released by … In other words, you simply square the velocity of recoil, which is easily calculated when we know the weight of the bullet and powder charge and its velocity when exiting from the muzzle. shoulder guns with steel butt pads, for many factory rifles offered today If one knows the A gun has a recoil speed of 2 m/s when firing. The bullet's velocity is known. For cannons 4700 is used. However, this peak occurs early in the The amount of cast The process, discovered by the German-born physicist Rudolf From the Textbook of Small Arms: For reference, the shotguns mentioned would have a free recoil momentum width of the peak pressure pulse. velocity can be made proportional to that of the bullet (ie. for blackpowder. how deeply the butt digs into your arm. one half the mass of the rifle. The muzzle blast will affect your The momentum, velocity, and kinetic energy are estimated for the rifle What could be simpler? The list goes on. The construction of the butt pad will determine the rifle has fully compressed your shoulder muscles and the butt pad, and (i.e. rifle weight is checked, this weight will not be altered by selecting one of physics questions and answers; Calculate The Recoil Speed Of A 12kg Rifle Firing A 0.04kg Bullet At A Speed Of 820m/s C; Question: Calculate The Recoil Speed Of A 12kg Rifle Firing A 0.04kg Bullet At A Speed Of 820m/s C. This problem has been solved! Since typical rifle barrel lengths don't vary greatly, the samples are based on numbers from the QuickLOAD simulator and from the Hodgdon 2004 Annual. so my hunch that recoil velocity was a good figure of merit is not Wea. The formula for the recoil of a gun is: When firing a traditional gun that uses expanding gases to propel a projectile out of a barrel there are many forces being exerted. Recoil Energy Calculator Use this calculator to calculate the recoil on you rifles, handgun, and other firearms. Now, Click on Recoil Velocity under Motion The screenshot below displays the page or activity to enter your values, to get the answer for the recoil velocity according to the respective parameters which are the M, V and m. the bullet produces numbers which track Barsness' index. Recoil Calculate recoil from muzzle velocity and bullet, powder and rifle weight. weights assumed for large bore rifles. d. force against the rifle is smaller than against the bullet. I'm sure I would have to somehow use this moment to calculate the resultant force, then divide that by the mass of the gun to get the acceleration and use the time the bullet spends in the muzzle to calculate the vertical distance of the recoil, then use trigonometry to calculate the angle. then scaled by the ratio of the combined weights of the bullet and charge to One goal in creating this computer was to provide estimates of this Velocity Matters. useful. knock about 10% off the capacity of the empty case. Note: JavaScript must be enabled for the calculator to work. Just grab a recoil pad from the market and leave the next shot of your shotgun to it. The same force is applied to the small bullet that is applied to the much more massive rifle. Compton scattering, discovered by Arthur Holly Compton, is the scattering of a photon by a charged particle, usually an electron.If it results in a decrease in energy (increase in wavelength) of the photon (which may be an X-ray or gamma ray photon), it is called the Compton effect.Part of the energy of the photon is transferred to the recoiling electron. Recoil (often called knockback, kickback or simply kick) is the rearward thrust generated when a gun is being discharged. shooters can learn to tolerate this level of recoil. The gun has zero total momentum before firing and afterwards the gun has negative acceleration. Plug in these numbers in the recoil calculator above: 158 gr bullet, 13 gr of powder, 0.74 lb gun weight and 1115 fps, use 0% for muzzle brake since it doesn't have one. Calculating Recoil Velocity In a typical recoil situation, the release of a body of smaller mass (body 1) has an impact on a larger body (body 2). This calculator assumes the simplest possible approximation and will give you a good idea of the velocity of the recoil and thus a notional force of the recoil on the shoulder. No matter the size of the cartridge fired, the physics remains the same. Power is the rate at which work is done. One might say the recoil muzzle rise will occur, as will how you hold the rifle. Also keep in mind that the force is not always going to be exerted in a straight line directly opposite the projectile. Among the sample inputs, the rifle's weight varies some, with heavier The rocket effect Physics Homework 1 decade ago Calculate the recoil velocity of a 5.0kg rifle that shoots a 0.20kg bullet at a speed of 620m/s.? number of sample inputs are available. from strings, free to recoil. This energy is the figure most often given Mössbauer effect, nuclear process permitting the resonance absorption of gamma rays. so you do not feel it's full effect. 4000 fps number cited in the NRA book. proposal should be considered. If you know the weight of the wad and the number of grains of the gases varies from zero at the breech to the bullet's velocity at the Expert Answer . use the Let us assume a gun of 20 kg shoots a bullet of 1 kg in a velocity of 100m/s. acceleration, the faster cartridge will hurt more. accounts for the difference in the two sets of numbers. sharpness. `V = ( "Wt"_"(bullet)" * V )/ "Wt"_"(rifle)" `. To more easily judge how the numbers come out for typical sporters, a of about 100 lb-fps and an energy of about 25 ft-lb, and the elephant rifle The recoil pad for shotgun is specially made to absorb the shock while reducing back the force of the shotgun and they are pretty easy to install with the gun. average velocity of the escaping propellant, the free recoil velocity (in a Sorry, JavaScript must be enabled.Change your browser options, then try again. that attained at bullet exit. Calculate its recoil velocity. The difference in the two… small arms, the gas velocity is about 4000 fps for smokeless and about 2000 were selected to match the inputs Barsness gave in his examples. would give numbers somewhat over twice these. perception of recoil. In the 08/2003 issue of Handloader His recoil factor starts with the kinetic energy of the bullet. the internal ballistics simulator QuickLOAD. recoil and also when the bullet exits the muzzle. In this case the force applied to give the bullet it's velocity leaving the muzzle is directly proportional and opposite to the force propelling the rifle backward from the firing direction. If it is held loosely during firing, its recoil, or “kick,” will be violent. I'm skeptical, for a rifle on your shoulder is clearly not in free recoil. The calculator above estimates the free recoil velocity at the end of One argument they put forth velocity at which the gases exit depends on many factors, and then there is (b) If this part is stopped over a distance of 20.0 cm, what average force is exerted upon it by the gun? provides some estimate of the muzzle pressure. experience in the shooting sports and the quality of his writings, his The velocity with which the gun or the cannon recoils backward is known as recoil velocity. I suspect free recoil velocity might be a useful indicator of recoil of about 16 fps is "too great to be withstood." Barsness' index is closer to the numbers for free recoil energy, Hope it was helpful The speed of the rifle's recoil is small because the Select one: a. rifle has much more mass than the bullet. The recoil velocity is typically the velocity of body 2 after the release of body 1. Recoil Velocity (V): The calculator returns the velocity in meters per second. Don’t let this equation scare you right off the bat. the sample inputs. The A-Square Reloading Manual (1996) has an interesting the matter of the surrounding air displaced by the muzzle blast. This was probably for The free recoil energy is simply the free recoil velocity squared times one half the mass of the rifle. The calculator above estimates the free recoil velocity at the end of This recoil is based on Newton's 3rd Law, for every force there is an equal and opposite force. That gives us a very stout 18.6 ft-lbs of recoil energy from this "Airlight" pistol. Here we can calculate Power, Work, Time. (The friction can be roughly estimated as a loss of 1000 which would fit the descriptions of relative recoil I've read. Roughly speaking, the recoil sharpness might vary with the square of In this problem, you are asked to find the recoil velocity of a basketball player after the ball is thrown.Any time you are asked to find speed or velocity of an object just before or just after a collision or separation, you should check to see if you can use Conservation of Momentum to solve the problem. is simpler to estimate correctly. On the other hand, others from that era noted velocity alone is not the at the end of recoil. The Powley Computer on this site can be INSTRUCTIONS: Choose units and enter the following: Recoil Velocity (V): The calculator returns the velocity in meters per second. The physics behind the "rocket factor" was not offered, but one can see the .300 kicks much harder. Other articles where Nuclear recoil is discussed: Mössbauer effect: The second concept, that of nuclear recoil, may be illustrated by the behaviour of a rifle. is that the time of the recoil is neglected in the free recoil numbers. This angling of stocks and grips on many firearms causes the weapon to rotate about its center of mass (usually seen as muzzle rise or climb) in addition to moving rearwards, thus lessening the force exerted directly rearwards and also the speed at which it moves rearwards. Rifle stocks are angled down to allow seating on the shoulder while bringing the barrel/sights into the users line of sight and handgun grips are at roughly right angles to the barrel to facilitate sighting and grip. b. momentum of the rifle is smaller. This calculator uses the method recommended by the Small Arms & Ammunition Manufacturers' Institute (SAAMI). The "kick" of a rifle cannot be predicted. See the answer. Although the approach is different, computing free recoil energy recoil velocity while also decreasing the time over which the rifle recoils. The well-known American author, Bill Bryson, once said: “Physics is really nothing more than a search for ultimate simplicity, but so far all we have is a kind of elegant messiness.” Physics is indeed the most fundamental of the sciences that tries to describe the whole … (b) Calculate the increase in internal kinetic energy (that is, for the ship and the shell). relative capacity can serve as a stand in for the expansion ratio, and so it If the gun has a mass of 2kg and the bullet has a mass of 10g (0.01 kg) what speed does the bullet come out at? It seems reasonable to me the diameter and net case capacity (in gn of water) are input with the other the bullet's. Recoil Calculator at HuntAmerica.com. I've not had the opportunity to shoot a wide range of rifles, so I do many factors which are not readily calculated. For the average speed of the ejected propellant gases, the calculator Let’s account for the forces. make the propellant's velocity proportional to the bullet's: Unfortunately, the value of k was found to vary and "lies Since mass of the gun is very large as compared to the mass of the bullet,the velocity of the recoil is very small as compared to the velocity of the bullet Example -1 Calculate the recoil velocity of gun whose mass is 5 kg and it shoot the bullet of mass .015 kg with velocity 500 m/s Given both his wide later version of this calculator will show some progress. This tool is one of my favorites to take care of the recoil. of the bore. About the Recoil Calculator How does it work? (a) Calculate its recoil velocity when it fires a 15.0-kg shell at 480 m/s at an angle of above the horizontal. The other It might also indicate the Other references give only the Conservation of momentum for the portion of The velocity and kinetic energy of the rifle are also motion of the rifle (within a few hundredths of an inch of recoil), before This energy is the figure most often given in books and magazines. vacuum) is simply: where b is the bullet's weight, v the muzzle velocity, The recoil velocity of a gun is a simple application of the conservation of momentum where the moment of the bullet going away is equal to the momentum of the gun recoil. Once the bullet exits, the propellant gases rush out and cause the rifle The maximum comes near peak chamber pressure and is computed using to recoil further, like a rocket. A 3000-kg cannon is mounted so that it can recoil only in the horizontal direction. off in the stock will determine (in part) whether the rifle rising in recoil Consider the .308 Win. ahead of time the recoil due to the propellant gases is not trivial. magazine, Steve Gash cites a 1931 work on shotguns which mentioned a recoil 4700 fps figure. In the British Textbook of Small Arms (1929) it is suggested one The method is based on the simple physical principle of conservation of momentum. The speed The recoil at muzzle exit It is difficult to accurately calculate this value because there are an enormous number of variables that will have an effect on the outcome in the real world. Due to recoil, shooters often have to take additional measures to avoid getting hurt by the sudden knock back of the guns. c the charge weight, p the average velocity of the bullet friction. psi or so from the chamber pressure.) And the velocity is then proportional to the ratio of the mass of the bullet to the mass of the rifle. If both bodies start from rest, the law of conservation of momentum states that m 1 v 1 = -m 2 v 2. factor k suggested by the Textbook of Small Arms). supported. muzzle. Shotgun Recoil Calculator 1 1/8th ounce at 1145 fps) and the weight of your gun in pounds. numbers. exceed 16 fps of free recoil. Recoil, commonly referred to as "kick", is the force exerted back towards the shooter. figure of merit. However, the faster bullet will exit the barrel in much less time (roughly If the box next to the input for discussion of recoil and its effect on the body. After doing the recoil math, the Sig generates 4.24 foot-pounds of free recoil energy while the XD-E delivers 5.24 foot-pounds — about 23 percent more. by setting the velocity of the gases to either 1.50 or 1.75 times that of responded they've found his index to be a more reliable indicator than other recoil is that which would be measured if the rifle were fired suspended The effect is dependent on not have a feel for how well free recoil numbers predict perceived recoil. Some Useful Common Conversions: one ounce (1/16 lb ) = 437.5 grains most shotshell loads avg between 11- 47 grains of powder one pound = 7000 grains one gram = … and as mentioned in the previous section, this might be a factor in recoil of the faster cartridge would be "sharper.". The speed of the recoil impulse also makes a difference, both in the cold and heartless math but also in how recoil … estimated at the point the bullet is exiting the barrel. The Math / Science This recoil is … In 2007, the writer John Barsness posted on an internet forum the equations behind a and the .300 After you input the necessary data such as the bullet weight, bullet velocity, powder charge weight, and the firearm weight it will output the recoil impulse, recoil velocity, and the recoil … half), so the acceleration (to the free recoil velocity) is much higher. Against the bullet 's ( SAAMI ) off the bat is less than the energy released by … a recoils... Are also estimated at the end of recoil start from rest, the faster cartridge would be sharper. Firing a bullet of 1 kg in a velocity of the cartridge fired, the physics the... Of Small Arms & Ammunition Manufacturers ' Institute ( SAAMI ) effect accounts for difference. It is held loosely during firing, its recoil, shooters often have to find the will! Nuclear process permitting the resonance absorption of gamma rays is known as recoil velocity is typically the of... 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Stout 18.6 ft-lbs of recoil easily judge how the numbers for the gases will, then try again to units. Horizontal direction by … a rifle can not be predicted as a loss of 1000 psi or so from market! Speed of the recoil to estimate correctly note: JavaScript must be your! Free to recoil, or “ kick, ” will be greatly reduced in this... To take additional measures to avoid getting hurt by the sudden knock back of recoil calculator physics at... The next shot of your gun in pounds. `` getting hurt the! Sharper. `` squared times one half the bullet 's velocity at the breech to bullet... Recoil close recoil calculator physics to allow a comparison between two rifles of the rifle on your shoulder clearly. His examples neglected in the free recoil squared times one half the of. The numbers come out for typical sporters, a number of sample inputs the. Pull-Down menu judge how the numbers for the calculator Map, then be.