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MUZZLE ENERGY CALCULATOR FOR FREE
Will receive the option for free ground shipping on items sold & shipped by Pyramyd Air during checkout.įree shipping may not be combined with a coupon unless stated otherwise. You may not be able to calculate the correct number in your head, but it's going to be a lot closer to 180 foot-pounds than to 500 foot-pounds.Īny order $150+ with a shipping address in the contiguous US and gets 500 foot-pounds of energy at the muzzle, you can now determine in your head that he is wrong. 50-caliber rifle shoots a 180-grain lead ball at 700 f.p.s. For example, many big bore airguns shoot about that fast, so all you need in order to determine their energy is look at the weight of the projectile they shoot in grains. The magic number is helpful when you have projectiles going near that velocity. generates 21 million foot-pounds, which is why we should be glad not too many cars ever go that fast. generates 20 foot-pounds and a million-grain (142.86 lbs.) projectile going 671 f.p.s. For example, an 8-grain pellet traveling 671 f.p.s. for any projectile gives the same energy number in foot-pounds as the weight of the projectile in grains. The problem above looks like this when written in mathematical notation:Ī velocity of 671 f.p.s. I'm going to round off the number to two decimal places anyway, so I write it down as 11.37 foot-pounds. There may be even more digits out to the right of the decimal point, but that's where my small calculator stops, so that's my answer.
Now, divide that number by the constant 450240 and you get 11.371712. The energy would be 8 times the square of the number 800, which is 640,000.
Suppose we shoot an 8-grain pellet at 800 (f.p.s.). That number is obsolete, but the number that replaces it, 32.174 feet per second (f.p.s.) below the 50th latitude, does not change the energy calculation significantly. The number I am using for the acceleration of gravity is 32.16 f.p.s. That last number is a constant created by multiplying two times the acceleration of gravity by 7,000 - the number of grains in a pound. Multiply the product of the weight of the pellet (in grains) times the square of the velocity and divide that number by 450240. Just use the calculator below and skip the math altogether!ĭo you want to place this and other populator airgun conversions on your web page or blog?
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