Measuring recoil?
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Tony Williams
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If you can measure the muzzle velocity (somewhat simpler) then you should be able to calculate the recoil. See: http://www.quarry.nildram.co.uk/ballistics.htm
Tony Williams: Military gun and ammunition website and Discussion forum
Tony Williams: Military gun and ammunition website and Discussion forum
Remember that there is recoil energy and recoil velocity( how fast the gun moves back) and apparent recoil. While the first two involve bullet weight and powder weight velocity and gun weight ,apparent recoil involves those things plus design of the stock and whether or not the gun fits you. A poorly designed, poorly fitting stock will greatly increase apparent recoil.
Tony Williams
Member
Quote from my article:
"The shape of the weapon can also affect the perceived recoil; in rifles, a "straight" stock which directs the recoil impulse into the shoulder causes less barrel jump than a dropped stock, which has the thrust line over the shoulder. In handguns, a revolver has a higher thrust line than other types and this may also cause more perceived recoil (although in the old-fashioned type of "western" revolver, the grip tends to rotate in the hand, absorbing some of the kick at the cost of considerable muzzle jump)."
Tony Williams
"The shape of the weapon can also affect the perceived recoil; in rifles, a "straight" stock which directs the recoil impulse into the shoulder causes less barrel jump than a dropped stock, which has the thrust line over the shoulder. In handguns, a revolver has a higher thrust line than other types and this may also cause more perceived recoil (although in the old-fashioned type of "western" revolver, the grip tends to rotate in the hand, absorbing some of the kick at the cost of considerable muzzle jump)."
Tony Williams
Sunray
Member
Geez, I recall seeing an article about this long ago. Haven't the foggiest where though. Seems to me it used a 1 pound weight pushing on a ft/lb scale. The rifle was held in place on a spring loaded vise. The rifle was fired, it recoiled, pushed the weight back and the scale told you how many ft/lbs. I think. It wasn't recently.
Tony Williams
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WilderBill
Member
Simple.
If it knocks fillings out of your teeth, it's too much.
If it knocks fillings out of your teeth, it's too much.
shoobe01
Member
Actual recoil will vary among action types also. The time the gun takes to recoil will be much longer for an autoloader as various parts are freely moving and using up the recoil energy. Brakes also get some of their effect by simply spreading out the recoil force.
Perceived recoil is totally subjective; there is no way to actually measure it quantatively.
I should think it would not be too hard to make a recoil sensor. You'd need to start with a machine rest of some sort that holds the rifle completely securely. If it flexes in the rest at all, then the results will be wrong. But, be careful where you pin it in for this purpose. An AR shouldn't be attached at the pivot pin if you are trying to measure the felt recoil (on the shooter's shoulder). A strain guage attached to a computer would then seem to work fine, as long as the connection picked up changes fast enough so you can see the recoil peak during the firing cycle.
Then, enjoy the data analysis.
Perceived recoil is totally subjective; there is no way to actually measure it quantatively.
I should think it would not be too hard to make a recoil sensor. You'd need to start with a machine rest of some sort that holds the rifle completely securely. If it flexes in the rest at all, then the results will be wrong. But, be careful where you pin it in for this purpose. An AR shouldn't be attached at the pivot pin if you are trying to measure the felt recoil (on the shooter's shoulder). A strain guage attached to a computer would then seem to work fine, as long as the connection picked up changes fast enough so you can see the recoil peak during the firing cycle.
Then, enjoy the data analysis.
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