05-20-2013, 08:25 PM | #1 |
Join Date: Jan 2008
Location: Somewhere between Cape Horn and Zenith Point
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[HT] Explosive Reactive Armor: Part II
Hello, folks.
Some time ago, I started a thread about Explosive Reactive Armor (right, right I misspelled it, here). Despite the effort, I still have some doubts about how ERA works in game. Recently, I come to play with armored vehicles again and the question about ERA armor came up one more time. But, this time I do some research and give a new thought. For starts, I found (ok, one I already see here in this forum quoted by Douglas Cole) two sites of huge help about this topic. This have RHA estimatives for modern tanks: http://collinsj.tripod.com/protect.htm And this, explain how a reactive armor works, and give an estimate for RHA equivalent armor for Kontakt-5 ERA that is both effective against chemical rounds (HEAT, HEADP) and Kinectic rounds (APFSDS). http://www.russianarmor.info/ On this last site, I found that Kontakt-5 have RHAe of 250mm (DR 700) vs Kinectic and 600mm (DR 1680) vs Chemical. Now, the problem: Only MS-HEAT could inflict damage to vehicles when these have ERA armor or not? For example, a Leopard 1A5 ( Turret DR 1260 [against HEAT/ RHAe 450mmm) with ERA ( plus DR 700/ 250mm [based on ERA used in M60 A1] would give a total DR 1960. So a HEAT missile that does more than 560d [7dx8(10)] with one warhead would still penetrate? |
05-20-2013, 09:22 PM | #2 |
Join Date: Jul 2008
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Re: [HT] Explosive Reactive Armor: Part II
Are you asking whether ERA makes it strictly impossible for HEAT to penetrate? It assuredly does not do that. A sufficiently large HEAT warhead can punch through spaced or reactive armor. It's good protection, not a shield of invulnerability.
__________________
I don't know any 3e, so there is no chance that I am talking about 3e rules by accident. |
05-21-2013, 01:05 AM | #3 |
Join Date: May 2013
Location: Ellicott City, MD
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Re: [HT] Explosive Reactive Armor: Part II
Good rule to live by: if something is not 100% immune to a damage type, all you have to do is hit for more than total DR to injure/damage your target.
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05-21-2013, 03:06 AM | #4 |
Join Date: Jan 2008
Location: Somewhere between Cape Horn and Zenith Point
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Re: [HT] Explosive Reactive Armor: Part II
No. I'm not asking it, but given the way ERA works, if one warhead could have its efficiency reduced. For example, the tip of the jet disrupted, not given full damage.
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05-21-2013, 06:06 AM | #5 |
Join Date: Jul 2008
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Re: [HT] Explosive Reactive Armor: Part II
Yes, of course, that's why the ERA provides DR at all
__________________
I don't know any 3e, so there is no chance that I am talking about 3e rules by accident. |
05-21-2013, 06:42 AM | #6 |
Join Date: Jan 2008
Location: Somewhere between Cape Horn and Zenith Point
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Re: [HT] Explosive Reactive Armor: Part II
Sorry. Let me rephrase it.
ERA works by disrupting the molten jet of HEAT. OK. But, when not using a MS-HEAT, a given ERA armor degrade perfomance of a HEAT warhead or this effect is already factored in on the RHA estimate? And, more, after passing through an ERA armor the armor divisor (10) still aplies for the main armor? |
05-21-2013, 02:32 PM | #7 |
Join Date: Aug 2004
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Re: [HT] Explosive Reactive Armor: Part II
-- In GURPS? ERA is a bit complicated both in actual use and in game rules -- the older rules are really only applicable to Gen1 ERA like Blazer. (Note: Don't have the books in front of me). But the ERA DR is the performance degradation (it's a reasonable abstraction). MS-HEAT should have a follow-on attack that ignores the ERA DR. I believe this is spelled out in High-Tech?
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05-21-2013, 03:20 PM | #8 | |
Join Date: Jan 2008
Location: Somewhere between Cape Horn and Zenith Point
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Re: [HT] Explosive Reactive Armor: Part II
Quote:
Last edited by General Lee; 05-22-2013 at 09:21 PM. |
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05-22-2013, 09:19 PM | #9 | |
Join Date: Jan 2008
Location: Somewhere between Cape Horn and Zenith Point
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Re: [HT] Explosive Reactive Armor: Part II
Quote:
Additionally, the "special" effect of the MS-HEAT, i.e, the second warhead ignoring the ERA DR, is achieved only if the first warhead defeated the ERA layer. For example, an ERA armor that gives 250mm RHAe (DR 700) is supposedly defeated by a warhead that does 6dx4(10). As the more modern ERA armor gives high levels of protection (DR 1,200+), the first warhead of a MS-HEAT round have to practically do damage of a full warhead 8dx5(10) to defeat the outer layer. The real issue is to gauge how effective is a given type of ERA armor, actually any type of armor. |
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Tags |
armored vehicles, explosive reactive armor, high-tech, rha estimate |
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