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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.
People should not be afraid of their governments. Governments should be afraid of their people.
 
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