02-15-2017, 11:51 AM | #51 | |
Join Date: Jun 2013
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Re: Layered Cutting Edge Armour
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Of course, I'd also prefer a system that differentiated amongst material cost and "labor" cost, with the latter having a note for how much time it corresponds to (higher skill laborers are paid more per unit time). I put labor in quotes because, at higher TL, things like the amortization on your sewing machine factor in (a machine that can readily handle ballistic fabric probably costs more than one that is used for more mundane fabrics). I know the DR values in Low Tech aren't linear, but approach being so as DR goes up (most of the metal armors work out as +1 DR per given unit weight - thus per unit thickness* - with a "free" +1 tacked on that accounts for things like padding, deflection, etc). The system in the armor design articles basically takes the linear relationship at higher DR and exports it down to apply at lower DR. *Technically, as thickness goes up, each unit thickness would cover a bit more surface area, so the weight increase wouldn't be quite linear, but would be close enough.ac Last edited by Varyon; 02-15-2017 at 11:57 AM. |
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02-15-2017, 12:23 PM | #52 |
Join Date: Jul 2008
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Re: Layered Cutting Edge Armour
There's the basis of that addition in quadrature business - making an armor layer twice as thick makes it twice as protective, but mounting two copies of that armor layer separately is more like sqrt(2) times as protective.
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02-15-2017, 01:05 PM | #53 | |
Join Date: Aug 2004
Location: Austin, TX
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Re: Layered Cutting Edge Armour
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02-15-2017, 01:30 PM | #54 | |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: Layered Cutting Edge Armour
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Independently of this, three layers of level IIIa armor (DR 12 each) will not stop a rifle bullet, so adding them together creates realism problems. |
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02-15-2017, 06:45 PM | #55 |
Join Date: Feb 2014
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Re: Layered Cutting Edge Armour
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02-15-2017, 07:10 PM | #56 |
Join Date: Sep 2004
Location: Canada
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Re: Layered Cutting Edge Armour
I think I just thought of a way to do it. Let me meditate and get back to you on this.
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02-15-2017, 08:02 PM | #57 |
Join Date: Jun 2006
Location: On the road again...
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Re: Layered Cutting Edge Armour
And Jägermonsters. Don't forget them. :)
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02-15-2017, 08:02 PM | #58 | |
Join Date: Jun 2013
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Re: Layered Cutting Edge Armour
Quote:
This raises a question, however - ballistic fabrics typically consist of multiple layers of fabric, sewn together (or similar) at the ends. It doesn't seem like laying a 10 layer jack on top of a 20 layer jack would be much different from a single 30 layer jack. Certainly, I wouldn't expect a brief bit of needlework at the edges (to nominally combine them) to triple the effective DR of the outermost layer. Should ballistic fabric simply follow the quadratic progression from the start - that is, should a half-inch thick piece of Kevlar have only 50% more DR than a quarter-inch one, rather than the currently-assumed 100% more (x2 DR for x2 thickness)? If not, what is it about the way layers of ballistic cloth in a single nominal piece are set up that make it count as a continuous whole, rather than as layers? *For example, if you have a DR 13 and DR 12 layer, the above has these combine into DR 17 (13 + 12/3), while a DR 12 and DR 12 layer would instead combine into DR 18. If you're really close to a breakpoint, it might be appropriate to use the lesser divisor. |
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02-15-2017, 10:17 PM | #59 | |
Join Date: Aug 2004
Location: Wellington, NZ
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Re: Layered Cutting Edge Armour
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The line is a bit blurry with flexible fabric armour, but it's not that blurry. FWIW, my ruling on layered armour and the DX penalty is based on the test "Were the layers designed to work together as a single set of armour?" It's not perfect, as there are some layerings that aren't, but probably shouldn't give a penalty (a ballistic coat over a thin undercover vest, for example), but it's a good rule of thumb to start from, IMO.
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02-15-2017, 10:34 PM | #60 | |
Join Date: Jul 2008
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Re: Layered Cutting Edge Armour
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cutting-edge armor design, pyramid #3/85 |
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