Quote:
Originally Posted by Varyon
You'd need to use the rules for layering armor here, essentially treating TR as though it were another layer. Note this means a TR 10 average human would need AV 7+ armor - equivalent to DR 4-5 - before there would be any benefit to wearing it (of course, I think I've seen mention in the past that historical armors tended to give DR 4+). You lose more resolution, but gain more simplicity... although you'd probably need to shift DV or AV+TR (either +4 to DV or -4 to AV and TR), as there's no longer the armor adjustment.
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Mine was a little more complicated. Basically, you combined AV & TR as follows:
If AV>TR, effective Toughness is the higher of
1. 3+AV-((AV-TR)/2)
2. AV
If TR>AV, effective Toughness is the higher of
1. 3+TR-((TR-AV)/2)
2. TR
So if TR is 6 or more higher than AV, the armor is ineffective. My conversion for DR was slower - I assumed DR is quadratic (i.e., 2 DR is four times. So my armor value would be something like:
(log(GURPS DR)*12)+7.
So mail with DR 4 would have an armor value of 14. A character with TR 10 wearing that armor would have a net Toughness of 3+14-((14-10)/2) or 15. Leather Armor would have a value of 11 or so - still providing a little benefit to someone with Toughness 15 or less.