09222010, 06:35 AM  #1 
Join Date: Jun 2010

How does ablative DR interact with armour divisors.
How does ablative DR interact with armour divisors? I've been trying to work it out.
Example: Armour, Ablative, 200. Gauss rifle, Armour divisor 3. Let's say the rifle does 30 damage on average, and hits 6 times in a burst of fire. So, we divide 200 by 3, resulting in 67 DR rounding. Then we divide 170 by 3, resulting in 57 DR, rounding. Then 140, resulting in 47 DR. Then 110, resulting in 37 DR. Then 80, 27 DR, meaning 3 damage to the target. Then 50, 16 DR, meaning 14 damage gets through. Is this correct?
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09222010, 06:57 AM  #2 
Join Date: Sep 2008

Re: How does ablative DR interact with armour divisors.
Looks about right. However, on the second to last hit, the armor only stopped 27 points of damage, so it should probably only take 27 points, not all 30. So, in the next part you'll be starting with DR 53, so effectively 17 DR, meaning 13 damage gets through, and so on (reducing only by 17 this time, as that's all the damage it actually stopped).
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09222010, 07:17 AM  #3 
Join Date: Jan 2005
Location: Japan

Re: How does ablative DR interact with armour divisors.
Here's my take.
Consider an extreme case: Cosmic Irresistible Attack, which is an alias of Armor Divisor Infinity. It simply pass through your DR and directly inflicts an injury on you, destroying none of your DR. That is, if the incoming attacks has an Armor Divisor, then it should also divide the number subtracted from your DR. Therefore, in your Ablative Armor DR 200 vs. 30 damage Gauss Rifle example: First bullet: DR 200, divided by 3, resulting in DR 66 (in GURPS combat, game stats are usually rounded down. See p. B9). The bullet is stopped, reducing DR by 30/3 = 10. Second bullet: DR 190, divided by 3, resulting in DR 63. Ditto. Third bullet: DR 180, divided by 3, resulting in DR 60. Ditto. Fourth bullet: DR 170, divided by 3, resulting in DR 56. Ditto. Fifth bullet: DR 160, divided by 3, resulting in DR 53. Ditto. Sixth bullet: DR 150, divided by 3, resulting in DR 50. Ditto.
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09222010, 07:25 AM  #4 
Join Date: Sep 2008

Re: How does ablative DR interact with armour divisors.
Personally, Gurps Fan, I think that makes armor divisor too weak against ablative and semiablative armor. It also has the odd effect of making Hardened a bad idea  you pay more for the trait to make it more ablative. I'd stick with the interpretation that it loses 1 point of DR per point of basic damage blocked.
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09222010, 07:30 AM  #5  
Join Date: Aug 2007

Re: How does ablative DR interact with armour divisors.
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09222010, 07:35 AM  #6  
Join Date: Jan 2005
Location: Japan

Re: How does ablative DR interact with armour divisors.
Quote:
After some search, I find that this question seems to have appeared repeatedly in the forum but the designers haven't never commented yet. I think this is FAQworthy.
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09222010, 07:48 AM  #7 
Join Date: Sep 2004
Location: Canada

Re: How does ablative DR interact with armour divisors.
The problem is that Armor Divisor overrides the "stops one point of basic damage" part of the sentence  it doesn't stop as much. Therefore the question of whether that impacts how much is ablated.
If the attack has an armor divisor because it melts holes in things, that certainly sounds like it should still be doing horrible things to the armor. But if it has an armor divisor because it's outofphase or partly made of weird exploding neutrinos or otherwise exotic and noninteractive, the argument that it should still make proportional holes in the armor starts looking weaker. But you pay the same for both versions, and if anything the magical phasing attacks would seem to be the one that should be MORE expensive, and yet they seem to be less effective (philosphically  at the moment both cases are indistinguishable in the rules).
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