TWMSR
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TWMSR reacted to a post in a topic:
Tanks guns and ammunition.
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TWMSR reacted to a post in a topic:
The Leopard 2 Thread
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TWMSR reacted to a post in a topic:
Britons are in trouble
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Could you elaborate your first point? How would you define the part of CH2 turret carcass in the process of defeating penetrator or jet? Could you also elaborate your second point? What would prove what?
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Properties of cast turret carcasses of Challenger 1 and Challenger 2 are not crucial for protection of those tanks. It is the last layer of armour array and it is not supposed to stop full-scale attack but to intercept residual jet or penetrator that would pierce special armour modules.
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It is not good simulation. BM15 is cored projectile, with tungsten carbide penetrator inside, not steel-only like BM12 or BM17.
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TWMSR reacted to a post in a topic:
Tanks guns and ammunition.
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TWMSR reacted to a post in a topic:
Ballistics FEA on Youtube
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The clue seems to be that sabots cannot be considered only or primarly as parasitic mass. Every gram counts, of course, but the most important task of sabot is transfer of acceleration load to projectile, and to do it in such way that would not interfere launching of that projectile and, as result, the bang it would do at the end of it's trajectory. There are many other issues about sabots, also of high importance as a problem of mass, and in many cases interconnected: sealing the bore, stiffeness of sabot, penetrator-sabot interface, ration of bore erosion, risk of projectile balloting, sabot separation. Decreasing of sabot weight must be made with all those mentioned above things in mind. The art of firing a projectile lies in efficiency of terminal ballistics, not pureness of interior ballistics or aesthetics of exterior ballistic. As for hollow design there were many such designs during APDS era. I recall also that 152 mm APFSDS XM578/XM579 got sabot with hollow area. Some modern sabots got external grooves or ribs that both increase stiffeness and decrease weight. But the limit for that designs remains in material behaviour during very high G acceleration, when any asymetric load could lead f.e. to asymetric sabot separation, which then could ruin accuracy or even cause projectile goes wild.
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TokyoMorose, thanks for that article. If those numbers are correct, level of mass reduction is phenomenal. There are however some points about that. First of all, M829A1 and A2 are very similar rounds, that got very similar penetrators and hence both uses sabots that are comparable in size. So if A1 sabot indeed weights 4,4 kg and it is stated that A2 sabot is 35% lighter, than it is easy calculation for A2 sabot. M829A3, on the other hand, is very different animal. It got long rod that is longer than just long If it's sabot is made of aluminium it would be heavier than A1 sabot. This is, probably, why in that article exact wording is 'additional 30% equivalent sabot mass reduction'. It does not sounds so simple like 'A2 sabot is 35% lighter than A1 sabot, and A3 sabot is 30% lighter than A2 sabot'. For me, at last, it sounds more like 'A2 sabot is 35% lighter than A1 sabot, and A3 sabot is 30% lighter than A2-technology level sabot if made for A3 projectile'. This makes calculations a bit more tricky, as we do not know mass of A3 sabot if made in A1-technology (aluminum), of A3 sabot if made in A2-technology (1st gen. carbon composite), and as it was eventually made. The other point now, 30% equivalent mass reduction between A2 and A3 sabots. Damn, how they did that? Both sabots are double-ramp design, A3 probably pinnacle of that design, with no easily visible means to reduce mass other than change of material. This suggest that 2nd gen. laminate of A3 sabot got much lower density - up to 30%. I would love to have a good read about that new carbon composites, anyone?
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Sheffield reacted to a post in a topic:
French flair
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Bore size plays it's role, but double-ramp sabots, developed for high elongation penetrators, needs to be long to properly support the rod during firing. Sabot design is not all about reduction of parasitic mass, it should be light enough, but it has other important tasks. Old Soviet 125 mm metal sabots got it's merits, but using ring sabots and full-bore fins and low elongation penetrators today might be considered as suboptimal. Changing sabot material, as in case of M829A1>M829A2, is one way to go (btw. where did you find information that sabot of M829A3 is 30% lighter than one of shorter's M829A2). The other is novel sabot design. And this is the way that Rheinmetall is said to choose in new developments (DM 73 probably not, KE2020Neo probably yes).
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- leclerc mbt
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TWMSR reacted to a post in a topic:
French flair
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Atokara reacted to a post in a topic:
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Laviduce reacted to a post in a topic:
French flair
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Great idea It is so silly to put parasitic mass into design, why do not use zero-mass sabots instead? And why waste so much energy on muzzle blast? All energy should go into penetrator, it must be easy task.
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TWMSR reacted to a post in a topic:
Vehicles of the PLA: Now with refreshing new topic title!
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DM 53 is 13 MJ at the muzzle - with sabot. For penetrator only it would be about 8,5 MJ at muzzle, and a bit less of impact energy at 2000 m. It seeems that Ascalon gives 10 MJ penetrator's energy (muzzle or 2000 m) from the start.
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Molota_477 reacted to a post in a topic:
The Leopard 2 Thread
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Someone do. It is DE102013101423. https://patentimages.storage.googleapis.com/84/45/e5/ab7a967a9f8dd9/DE102013101423B4.pdf
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Maybe it is a matter of being prototype - but turrets on both vehicles that were shown are a bit different. Not only armament (gun itself, it`s craddle, mask) but look also at lower edge of turret. Looks like different masking of "core" turret. We need more better pictures, not just stills from video. Leo 2 turret would need some rework to not only look like Altays, but to be functional (f.e. reposition of sights, slight in case of gunner's, bigger in case of commander's). Sit and wait.
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Modified Leopard 2 turret. Applique modules, new fire control, RWS, IFF, but all on orginal turret.
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Pardus reacted to a post in a topic:
The Leopard 2 Thread
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TWMSR reacted to a post in a topic:
Israeli AFVs
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So Turkish bought IMI's M325 and Poongsan K277 HEAT-T ammo for their tanks. And the latter type works so-so.
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RH guy, when asked, stated that A1 got new primer, that meet more strict requirements on electromagnetic radiation hazards.
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Laviduce reacted to a post in a topic:
Contemporary Western Tank Rumble!
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Wiedzmin reacted to a post in a topic:
Contemporary Western Tank Rumble!
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Frame/spacer.
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Indeed. But if you look at pictures of Turkish "60s" you can see that it is not uncommon to put spare track links or wheel discs on turret walls. Those parts could be blown off when hit by warhead. In this case there coul be seen splash marks on yellow paint on the left.
