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Bronezhilet

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Everything posted by Bronezhilet

  1. Bronezhilet
    Yes. Above test was an inert reactive armor test, an explosive reactive armour test gave this result: (part B is the same as "t = 30 microseconds" in the first picture) Interesting to note that the first ~5 cm of the jet in the inert test isn't damaged, but is in the explosive test. Is it because it had to pass through a shock front, or something else? This is also interesting:
  2. Bronezhilet
    Well, after some more research, I might be the one that's wrong. It might have something to do with the Kelvin–Helmholtz instability, which is deforming the jet. But I'm not completely sure. ...five posts in a row, somebody stop me.
  3. Bronezhilet
    Forgot to mention, the PETN block is 50x200 mm. This block creates a nice and clear shock front and rebound, but I bet you can make some very creative and effective shock fronts/waves by changing the shape of the block, inserting non-explosive elements, changing the shape of the backstop, etc.
  4. Bronezhilet
    Colli, it looks like you might be wrong. I did some checks on how the detonation wave travels through a block of PETN. The shock front has a pressure of ~25000000 kPa, or 250000 bar (that's 3.6 MILLION PSI for you imperialist bastards). I know that ERA isn't mounted directly onto the armour, but oh well. Sidenote: I made a hole in the flyer plate, which makes no sense in a 2D simulation. The plate would fly straight forward irl. When the shock front hits the armour, it rebounds, creating a pretty nasty pressure spike of ~53000000 kpa, or 530000 bar (7.7 MILLION PSI). This all happens in ~0.006 ms, or 6 microseconds. After ~0.009 ms, or 9 microseconds: And when you wait a really really really long time, like 0.04 ms, or 40 microseconds, pressures drop to more acceptable levels: The shock front is gone, but a high pressure area stays. Max pressure is 7400000 kpa, or 7400 bar (~107000 PSI). Pressures are dropping very very quickly at this point. In 0.003 ms, or 3 microseconds, pressure has dropped by 2000000 kPa, or 2000 bar (~30000 PSI). I think the forward charge is indeed intended to set off the ERA blocks. Not to get the blocks out of the way, but to prevent a collision between the main jet and the shock front moving at ~7 km/s. I can totally see an ultra-high pressure front moving at hypersonic speeds screwing up a HEAT jet. Edit: I don't know what the detonation speeds of the explosive compounds in the most common ERA blocks are, they're probably slower than 7 km/s.
  5. Bronezhilet
    I always thought "an AR can't feel that light, can it?". Then an armourer handed me a Colt 601/2 and an AR-10... Holy CRAP those are light.
  6. Bronezhilet
    Turns out Windows cannot handle 4000 files on my desktop. On a sidenote, dont tell ANSYS AUTODYN to save files on your desktop.
  7. Bronezhilet
    I was looking around and I noticed that the stand-offs on the Panzerfaust 3 and 3T. It looks like the 3T has a longer stand-off than the 3, which makes no sense at all. If the forward charge is designed to get the ERA out of the way the stand-off would be huge for the main charge. Granted, the mirror might be different, but that most likely will not result in a 10+cm stand-off change. Also, I don't know about 3BK31, but older variants bleed speed quite quickly. Sure they won't go reach Panzerfaust speeds at a reasonable distance, but BK-14M dips under Mach 1 between 3300 and 3400 m. It looks to me that the second main charge of the 3BK31 round is designed to hit the exact same hole as the first main charge. They're basically trying to make one very long jet, or 2 jets that hit the exact same spot. The diameter of the second main is quite a bit smaller as the first one as well. As for the forward charge... I'm downloading ANSYS right now. Hopefully I can run some simulations without too many problems.
  8. Bronezhilet
    Colli, I'm getting more questions than answers here. When I get home I'll do some more research/thinking and hopefully I can make some sense then.
  9. Bronezhilet
    Apart from me thinking the flyer plate was something completely different, the post still stands (yay). But it's the forward charge that sets off the flyer plate, not the main charge. To see how the flyer plate would interact with the main charge, I'd have to time a bunch of stuff. Basically you'd want to know if the main jet is following the (intended) path of the forward charge. Seeing the material and shape of the forward charge (in the Panzerfaust 3T), it is intended to make a wider hole than the main charge. Same with the 3BK31, all mirrors have a different size and shape. As I see it, the forward charge clears a wide enough path for the main charge, allowing the main charge a clear path/corridor to the main armour, before the expansion of the ERA. But that completely depends on the timing of, well, everything. It would be nice to find out though. Does somebody have a better picture of a 3BK31 round? I can't find anything.
  10. Bronezhilet
    The Dutch got the best solution to the problem! They fucking sold all their tanks.
  11. Bronezhilet
    The jet itself moves at hypersonic speeds, you'd need a bit more room if you want things to get out of the way. Jets laugh at thing like that anyway. I've seen footage of a forward charge/initiator penetrate an APC hull from side to side, after which it kept going*. Unless the flyer plate interferes with the proper detonation of the shaped charge, it will not have a noticable effect on the jet. Also, it looks like the forward mirror of the Panzerfaust 3T is aluminium, unlike the main mirror. * Cant tell what hit what, because OPSEC.
  12. Bronezhilet
    I was going to say "America, you never cease to amuse me" but it's made by a Canadian company. Dear firearms industry, What. Regards, Bronezhilet
  13. Bronezhilet
    Well, you gotta admit, "sturgeonshouse.ipbhost.com" sounds really similar to "www.automags.org", doesn't it?
  14. Bronezhilet
    Balls.
  15. Bronezhilet
    Oh wow, this is brilliant. NA drama best drama.
  16. Bronezhilet
    How not to fire a muzzle loader.
  17. Bronezhilet
    Hmm, I could have sworn heavies couldn't mount Vstab, only GLD. Now there is officially no reason to mount GLD. Ever.
  18. Bronezhilet
    Since when can heavies mount vstab?
  19. Bronezhilet
    This is not correct. A shape stabilised projectile is not as aerodynamic as a projectile with a cone/ogive nose. In the comparison simulations I did, a shape stabilising nose has about 20% more drag than an ogive nose. Now, I don't have either a 3D model of the 3BK-15 or the shell it replaced so I can't do an accurate comparison. But a shape stabilising nose cannot, to the best of my knowledge, be more aerodynamic than an ogive nose. As for the second part, here's how the stabilising actually works
  20. Bronezhilet
    ERC 90 F4, to be exact.
  21. Bronezhilet
    Yes, given clear terrain the radar can track the projectile as long as there is a clear line of sight. I'm not completely sure, but I don't think doppler radars have OTH capabilities. Depending on make and model doppler radars can track multiple projectiles. Doppler radars are very powerful tools, but you really need to know wtf you're doing, since they can be affected by terrain and placement.
  22. Bronezhilet
    Too bad doppler radars are annoying to work with.
  23. Bronezhilet
    They're doppler radar units. Generally used as an Mv radar or as a long range tracking radar. The Mv radars are pretty small: (Spot the transmitter) But the long range tracking radars are slightly bigger: Source for last picture: http://www.dtic.mil/get-tr-doc/pdf?AD=ADA440351
  24. Bronezhilet
    The T-34-3 is pretty gud after the patch, I must say.
  25. Bronezhilet
    That loss must have hurt. If I had any meaningful tanks on my NA account, I'd love to platoon. But I only have tier 2s an a freaking Sexton.
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