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Message: <blockquote data-quote="Random Bystander" data-source="post: 7198698" data-attributes="member: 6702095">Would anyone happen to know the answers to the following questions, with regards to collisions between projectiles (ex: arrows) and armour (ex: plate cuirasses)? I have, at this point, been able to determine that heavier, slower projectiles do less damage, but have an "armour piercing" effect; while lighter, faster projectiles do more damage, but begin to do less damage against armour (what GURPS(tm) would give an armour multiplier). However, actual math is...scarce; and, in essence, I have discovered no more information than I could have found out by watching 2-3 target-shooting videos on Youtube(tm). And yet, I have spent quite a bit more time searching than 1.5 hours. In fact, the best math I have found is the derivation of the GURPS(tm) formulas for gun damage...Which is formulated for Imperial units, and is thus impenetrable (to me).1) How does surface area affect force of impact?2) Should I use Newtons, *Joules, or some other unit of measurement?3) Is there a **good terminal ballistics website that goes over the math?4) Is there any ***questions that either I should have asked, and/or would have been better asked than the one(s) that I did?* Attempting to back-calculate from Joules results in the aforementioned armour-shattering arrows.** Most of what I have found is either thesis on the ethics of hunting, or thesis on the results of hunting. Neither is all that relevant to determining the depth and quality of steel plate (or, indeed, d20 System(tm) Mithral(tm)) that a longbow arrow may penetrate). In addition, searching for terminal ballistics books on Amazon reveals prices in excess of one hundred and fifty dollars, which is more than I am prepared to spend on what is, ultimately, an intersection of hobby and curiosity.*** Inquiries as to my sanity or the point of all this can be answered in the same spirit as a mountain-climber who has found an interesting-looking peak.With humorous frustration, Random Bystander.</blockquote>

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