Xlucine Posted February 22, 2017 Report Share Posted February 22, 2017 Made in iraq, IIRC with external support. It's NERA all right, here's a better look at the cutaway section: Met749, Zyklon, That_Baka and 1 other 4 Quote Link to comment Share on other sites More sharing options...
Renegade334 Posted February 22, 2017 Report Share Posted February 22, 2017 Are there any known cutaways/schematics of SLERA armor? Is it just NERA armor with minute doses of explosives mixed into the rubber layers or is it something else entirely? Quote Link to comment Share on other sites More sharing options...
Toxn Posted February 23, 2017 Report Share Posted February 23, 2017 More fun with calculated values - I stuck the values from Tank Designer 0.9 into a new spreadsheet, fixed them up a bit and then used solver on them to try to come up with an optimised array against all threats. ERA wins hands down, with NERA being the second-best option when ERA is excluded. Here it is interesting to note that the solver never comes up with multi-material arrays (combining, say, a material good against APFSDS with a material good against HEAT). It is also interesting to note the sheer advantage even the gimped ERA values have in terms of areal density. I'm really wondering at this point how hard it would be to make an armour package that simply consists of stacked, hollow RHA boxes (with holes to vent gas) filled with ERA bricks. You could lay this stuff in two rows deep for protection against tandem charges, and still get an areal density 1/4 of the equivalent level of RHA protection. That_Baka 1 Quote Link to comment Share on other sites More sharing options...
Toxn Posted February 23, 2017 Report Share Posted February 23, 2017 Since I keep banging on about misinformation, someone needs to update this at some point. Quote Link to comment Share on other sites More sharing options...
FORMATOSE Posted February 23, 2017 Report Share Posted February 23, 2017 16 hours ago, Xlucine said: Made in iraq, IIRC with external support. It's NERA all right, here's a better look at the cutaway section: That_Baka 1 Quote Link to comment Share on other sites More sharing options...
Khand-e Posted February 23, 2017 Report Share Posted February 23, 2017 14 hours ago, Renegade334 said: Are there any known cutaways/schematics of SLERA armor? Is it just NERA armor with minute doses of explosives mixed into the rubber layers or is it something else entirely? The only "supposed" cutaway I could find was some rumored cutaway of the LeClerc's armor package, but quite a few people doubted the validity of it. That_Baka 1 Quote Link to comment Share on other sites More sharing options...
Andrei_bt Posted February 24, 2017 Report Share Posted February 24, 2017 Concerning shaped charge Beyond-armour effect. The results of soviet tests in 1968 (development of integrated ERA) using pressure sensors and rabbits. In case of penetration of 115 mm HEAT round inside the testing rig sensors recorded overpressure with an amplitude of 0.4 kg / cm2. Such overpressure can be considered dangerous for humans. http://andrei-bt.livejournal.com/469619.html That_Baka 1 Quote Link to comment Share on other sites More sharing options...
Mighty_Zuk Posted February 24, 2017 Report Share Posted February 24, 2017 That's new info. Thanks. I've been hearing about the effects of open hatches upon hits (primarily HEAT charges) but I've never quite understood the logic there. Always thought I've missed some parameter. Because either way, you're going to get your ears popped and a serious concussion. This level of pressure shouldn't just be dangerous, but lethal in close proximity, as it's enough to have it applied to your neck and you're done for. But how consistent is that pressure across the tank and how effective are NBC systems against such sudden rise in overpressure? That_Baka 1 Quote Link to comment Share on other sites More sharing options...
Xlucine Posted February 24, 2017 Report Share Posted February 24, 2017 Compare and contrast with this british bunny tank: http://www.dtic.mil/docs/citations/ADA474293 Quote Link to comment Share on other sites More sharing options...
Collimatrix Posted February 24, 2017 Author Report Share Posted February 24, 2017 Dart was apparently this thing I'd never heard of before. A malkara with a shaped charge up front would be the most hysterically overpowered thing. I'm sad now that it never got made. Quote Link to comment Share on other sites More sharing options...
Mighty_Zuk Posted February 24, 2017 Report Share Posted February 24, 2017 coli your link is broken or not working. EDIT: Working now but slowly. Looks like a chubby fun little toy to have What's the warhead's weight? Quote Link to comment Share on other sites More sharing options...
Andrei_bt Posted February 25, 2017 Report Share Posted February 25, 2017 Quote This level of pressure shouldn't just be dangerous, but lethal in close proximity Yes it is local effect (close to the shape charge jet) but it has habit to reflect from tnak internal surfeces. Quote Link to comment Share on other sites More sharing options...
Toxn Posted February 25, 2017 Report Share Posted February 25, 2017 Even more fun with models - I used solver and the longrods calculator spreadsheet to optimise penetrator designs and then optimise armour values against them. It turns out that if you select for maximum ME and limit TE to RHA or better you discover that the perfect alloy is something in the region of 8-9g/cm3 and has a hardness of about 450 BHN. ME is then about 1.12 for a TE of 1. Edit: what actually happened in that I maximised TE while holding ME at 1 or better. The optimal hardness is still 450 BHN, and the density is 9.2g/cm2. The result was a TE of about 1.17. Optimising ME while holding TE at 1 or better nets you an ME of 1.17, a density of 6.7g/cm2 and a hardness of 450 BHN. I wonder if there are any high-hardness, high-density steel alloys that fit the bill? Edited because I actually have the sheet in front of me now, and my memory sucks. Quote Link to comment Share on other sites More sharing options...
Collimatrix Posted February 25, 2017 Author Report Share Posted February 25, 2017 I don't think that steel alloys vary too much in density. Quote Link to comment Share on other sites More sharing options...
Toxn Posted February 27, 2017 Report Share Posted February 27, 2017 On 25/02/2017 at 9:30 PM, Collimatrix said: I don't think that steel alloys vary too much in density. That's my understanding as well. Beryllium copper comes close, although that's a high price to pay for a sub-20% increase in TE. Quote Link to comment Share on other sites More sharing options...
tomtom Posted April 15, 2017 Report Share Posted April 15, 2017 On 21.02.2017 at 0:13 AM, DD000 said: What does it say for the 6th material down? The one with a density of 1.0 - 1.1 g/cc. (Also, it triggers me that the rows for the material and values in the second table aren't aligned...) Polyurethane, polyethylene in multi layered systems alternately(more proceeded by(I have no fck idea what they meant there so literal translation)) with layers of steel. If anything else need to be translated from Polish language I can do it. Quote Link to comment Share on other sites More sharing options...
Collimatrix Posted April 15, 2017 Author Report Share Posted April 15, 2017 Welcome to SH tomtom! Quote Link to comment Share on other sites More sharing options...
SH_MM Posted May 3, 2017 Report Share Posted May 3, 2017 So apparently the Japanese Type 83 87 self-propelled air-defence vehicle is fitted with NERA along the frontal hull... Zyklon 1 Quote Link to comment Share on other sites More sharing options...
Xoon Posted May 3, 2017 Report Share Posted May 3, 2017 6 minutes ago, SH_MM said: So apparently the Japanese Type 83 self-propelled air-defence vehicle is fitted with NERA along the frontal hull... Yes, quite old news actually. Some guy at the WT forums found out about it, and now everyone there are losing their shit about the composite armor on it. Though, quite confusing to use NERA for small arms protection. Quote Link to comment Share on other sites More sharing options...
Andrei_bt Posted May 3, 2017 Report Share Posted May 3, 2017 it won't work at such angle Quote Link to comment Share on other sites More sharing options...
Xoon Posted May 3, 2017 Report Share Posted May 3, 2017 19 minutes ago, Andrei_bt said: it won't work at such angle Is it possible it is just spaced armor? And, isn't it named Type 87? Quote Link to comment Share on other sites More sharing options...
Ramlaen Posted June 3, 2017 Report Share Posted June 3, 2017 Apparently bundles of cardboard can stop RPG's. Quote Link to comment Share on other sites More sharing options...
Renegade334 Posted June 3, 2017 Report Share Posted June 3, 2017 A Filipino LAV-300, I surmise? Better not get that cardboard wet, boys. Remember that Mindanao's standing right in the middle of the Pacific Ocean's typhoon birth canal. XD Quote Link to comment Share on other sites More sharing options...
Mighty_Zuk Posted June 3, 2017 Report Share Posted June 3, 2017 Thailand did it first with their M60, except with high quality logs. Quote Link to comment Share on other sites More sharing options...
SH_MM Posted June 4, 2017 Report Share Posted June 4, 2017 From a patent by Diehl BGT Defence: anti-EFP-IED & anti-KE armor, that can be fiitted with additional NERA plates (number 11) to also work against shaped charges: For those believing in perforated DU/DU rod armor inside the Abrams, this might be a possible explanation of how the armor looks like. It is claimed that such a layout can be rather weight efficient against EFPs, the metal rods with quadrangular cross-section can be hollow and made of conventional sturcural steel (rather than armor steel) to save costs. Alternatively they can be made of armor steel and/or filled with another material if desired. 18 hours ago, Ramlaen said: Apparently bundles of cardboard can stop RPG's. According to rumors, this was a Chinese-made Type 56 (RPG-2 copy) and it still managed to penetrate the base armor, wounding at least one crew member. Met749 1 Quote Link to comment Share on other sites More sharing options...
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