Originally Posted by

**tankgeezer**
Ask, and you shall receive..

The formula for homogeneous armor penetration is "T = (K)[(0.5)(W/g)V^2]^p", where "T" is the thickness of plate barely penetrated (by whatever definition of "penetration" you want to use), "K" is a constant (a "catch-all" that changes with projectile nose shape, projectile size, projectile damage, definition of "penetration," plate type, and obliquity angle of impact), "W" is the projectile's total weight, "g" is the acceleration of gravity to change weight to mass (inertial resistance) (NOTE: "g" factor is not needed if the weight is in KILOGRAMS, which is already a measure of "mass" and has the "g" division built-in), "V" is the striking velocity, and "p" is a constant--usually between 0.5 and 1.00--that raises the entire projectile total kinetic energy value "KE = (0.5)(W/g)V^2" to a single power as a unit (p does NOT change with projectile properties (other than nose shape), plate type, or obliquity angle, though). Both K and p are good for only a limited range of plate thicknesses, with up to 5 combinations of K and p needed to handle the entire thickness range from paper-thin plate to bank-vault-door thickness for some projectile designs even with no projectile damage. Note that in this formula the two terms W and V^2 are of equal importance, as in any true KE-dependent penetration formula.

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