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Originally Posted by engineglue:
One formula I wanted to use is; penetration equals bullet weight times velocity divided by the diameter of the nose of the bullet divided by five. I don't really have the resources to acquire the data needed to make a chart which utilizes this formula.
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The formula you propose sounds an awful lot like Vernal Smith's equation for bullet penetration in wetpack- basically momentum divided by velocity and a scaling factor....
Penetration (inches) = Bullet Weight (lbs) x Impact Velocity (fps) / Meplat Diameter (inches) / 5
...found here
http://www.rathcoombe.net/sci-tech/b...s/methods.html
It's not bad for being as simple as it is- linear equations have a certain robustness that seems to compliment their simplicity.