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Any chance of calculating impact of these at say 225 fps? How about for a 1.5" that weighs in at 32 grams?
Kinetic energy can be calculated using KE = 1/2*M*V^2, where M = mass of the projectile in kilograms, and V = the velocity of the projectile in meters per second. So for your inputs,
KE = 1/2*0.032*68.6^2 KE = 75.3J As for energy density, a 1.6" projectile has pi*0.8^2 = 2.01in^2 of frontal surface area, so the energy delivered to the target per square inch of frontal surface area is 75.3/2.01 = 37.5J. Generally speaking, the higher this number is, the more penetrating ability the round has.
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What about the density of the object? I am waiting for the density numbers for a foam round. I am sure this delivers (or disperses) energy differently than a potato. Thanks for the info.
Well, the density will effect the mass of a round that displaces a particular volume, thus effecting the kinetic energy calculation, which in turn effects the energy density calculation.
This page shows that Styrofoam has a density of 100 kg/m^3, which converts to 1.64 g/in^3 for ease of calculation. A 1.6" x 2" slug will thusly have a mass of (pi*0.8^2*2)*1.64 = 6.6 grams. Assuming the same velocity (which will not be the case given an identical launcher), the Styrofoam slug will have a muzzle energy of 1/2*0.0066*68.6^2 = 15.5J, and an energy density of 15.5/2.01 = 7.7J/in^3. ...Of course, a slug with a mass of 6.6 grams will be traveling much faster than one with a mass of 32 grams when fired from the same launcher, and so the energies will be somewhat more similar.
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