01-11-2017, 12:18 AM | #11 | |
Join Date: Jan 2010
Location: Brighton
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Re: Combining and Layering Flexible Armor Against Firearms
There is a way you can do this by GURPS (or more precisely by Douglas Cole's rules for armour as dice and his further rules for kevlar style flexible armour here)
The round is 5d IIIa = 12DR which in armour as dice is 3d+2 Now normally in armour as dice if you put 4x layers of 3d+2 up against 5d the 5d will be stopped dead (by the 2nd layer), pretty much the same as the normal GURPS DR rules. But if you take the rules tweak for kevlar type armours each layer of 3d+2 Kevlar will subtract 3 points from DR not 3d+2. So against 4 layers of DR12 Kevlar you'd end up with 5d-12 = 2d-2* Now to save time I just multiplied the effect of the first layer by the number of layers. You could run it one at a time, (you might get different results due to several instances of rounding) But basically: Quote:
*now maybe that's not 6" of ballistic gel and 4x milk cartons, but it's still a significant wound. But if we're saying those panels don't qualify as DR12 and 3d+2 (and some here seem to be) but are maybe less protective enough to end up as 2d+x in this system than you'll be left with more penetration. IIa is DR8 = 2d+1 for instance. Actually since it's DR8+ DR12+DR12+DR12 so (2d+1)+(3d+2)+(3d+2)+(3d+2) you'd be left with 5d-11 = 2d-1 penetration Last edited by Tomsdad; 01-13-2017 at 06:28 AM. |
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01-11-2017, 12:35 AM | #12 |
Join Date: Jan 2010
Location: Brighton
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Re: Combining and Layering Flexible Armor Against Firearms
Another way to do it is the way the old CP2020 rules worked for layering flexible armour.
Instead of just summing all the layers, the first layer got full value but subsequent layers just gave a relatively small bonus depending on how close they were to the value of the first layer. Last edited by Tomsdad; 01-11-2017 at 12:42 AM. |
01-11-2017, 01:36 AM | #13 |
Join Date: Jan 2010
Location: Brighton
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Re: Combining and Layering Flexible Armor Against Firearms
One other thing watching that chaps video he records 1872 fps
which on a 147gr bullet comes out at 1551j so that's 5d-1 I think according to the reloaded chart (not a big difference, and one that can easily be a rounding difference but since he gave the actual recorded speed) Last edited by Tomsdad; 01-11-2017 at 02:35 AM. |
01-11-2017, 07:37 PM | #14 | ||
Join Date: Jan 2008
Location: Somewhere between Cape Horn and Zenith Point
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Re: Combining and Layering Flexible Armor Against Firearms
Quote:
Quote:
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01-11-2017, 11:48 PM | #15 | |
Join Date: Jan 2010
Location: Brighton
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Re: Combining and Layering Flexible Armor Against Firearms
Quote:
Yeah sorry you did |
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01-12-2017, 06:56 AM | #16 |
Join Date: Jan 2008
Location: Somewhere between Cape Horn and Zenith Point
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Re: Combining and Layering Flexible Armor Against Firearms
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01-12-2017, 09:30 AM | #17 | |
Join Date: Jan 2008
Location: Somewhere between Cape Horn and Zenith Point
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Re: Combining and Layering Flexible Armor Against Firearms
Quote:
I do some testing with this rule and I think it works very well for me. Considering that soft armor encountered nowadays would have DR ranging from 6 to 16 (DR 6-16), using the rule above, each layer will present only 2-5 DR. So, in the example, (IIa+IIIa+IIIa+IIIa) against .300 AAC BLK (5d, or 18 Hit Points on average), all layers have inferior DR than the damage rolled, so the rule kick in, giving a combined DR of 14 (IIa[DR2] + IIIa[DR4] + IIIa[DR4] + IIIa[DR4]). Thence, the wearer of this combo-armor would have 4 Points of Basic Damage. Close to the 2d-1 of penetration achieved [actually 33% less of penetration on average], using armor as dice rule as described in Tomsdad post. Last edited by General Lee; 01-12-2017 at 09:38 AM. |
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01-12-2017, 09:42 AM | #18 |
Join Date: Oct 2004
Location: The former Chochenyo territory
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Re: Combining and Layering Flexible Armor Against Firearms
Another approach to reduce the effectiveness of the extra layers could be to give the best layer its full DR, second gets half, third gets one-third, etc. So for the example of DR 8, 12, 12, and 12, it would add up to:
12 + 12/2 + 12/3 + 8/4 = 12+6+4+2 = 24
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01-12-2017, 09:56 AM | #19 | |
Join Date: Jan 2008
Location: Somewhere between Cape Horn and Zenith Point
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Re: Combining and Layering Flexible Armor Against Firearms
Quote:
Because of that, I think that both rules above explained better the article that makes me post this thread firstplace. |
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01-12-2017, 03:45 PM | #20 |
Join Date: Mar 2005
Location: Maitland, NSW, Australia
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Re: Combining and Layering Flexible Armor Against Firearms
It might be simpler to simply subtract one die per layer.
First layer gets full value Second layers gets -1 die Third layer gets -2 dice etc. The result would be that lighter layers effectively contribute nothing extra.
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Tags |
flexible armor, high-tech, layering armor |
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