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Zadlo

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Zadlo last won the day on November 8 2019

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  1. Maybe it would be theoretical in Ukraine. In Central Europe CR2 would spot T-14 at maximum 1500 meters. It's not hard. It's impossible because of topography. Even optical artillery observation systems placed on ground platforms are limited there to maximum 3 kilometers.
  2. That was blue-on-blue but rather with NM 222 (Mk 264) MP-T than with NM 225 (Mk 258) APFSDS-T.
  3. Soviets needed T-72 in early 70s because T-64A (and later B) had turned into one huge experiment. You can't have a proven MBT if tanks from other production series are made differently.
  4. Ad. 1 The main aspect is the hardness of armour material which enables to erode the projectile. For RHA you have some 300 HB, classic HHA has ~500 HB, UHHA has 600-700 HB. Meanwhile worse alumina has ~1400 HV, better one has ~1700 HV, silicon carbide has between 2200 and 2500 HV, meanwhile boron carbide has ~3000 HV. But yeah, boron carbide is not the best material because usually turns into glass during impact. On the other side tungsten carbide used in cores has ~1200 HV. If armour material has higher hardness that projectile / core material it is better for protection. In case of ceramics shape is another factor while often ceramics placed in plates made for personal protection don't have optimal shape for protection (in reference to armour thickness) but here these shapes are better for multi-hit protection. Ad. 2 You can do it only with silicon carbide, boron carbide or composite composed of both. Nitrides don't offer such low effective weight. Zirconia is too heavy. While you can't make such a small grain in alumina. But spall liner from both sides of ceramics helps a lot in lowering armour effective weight. Also the method of effective weight calculation is important to conclude how light the armour can really be.
  5. What is dimensions of single ceramic 'block' in a composite plate? It is quite important to understand this problem.
  6. Performance of several aluminium alloys against .30-06 and .50 projectiles - chart is based on several US standards (MIL-DTLs) and experimental tests made by USARL. * E(V) - TE, E(m) - ME
  7. Only vaporwave because people from Arey are smart people and they want to insert ceramic fillers to armor.
  8. A bit wrong. For standard 8x8 wheeled APC using 14.0R20 tires the acceptable weight for this ground pressure (I mean 350 kPa) is almost 24 mt (precisely 23,8 mt). For newer vehicles using 16.0R20 tires it is 28,5 mt. On the other side for 13mt SKOT using smaller tires (13.0R18) the ground pressure is 250 MPa. But there's one assumption. This numbers are related to situation where the vehicle goes through untreated, wet terrain f.e. ploughed-up cornfield. On unpaved road the problem exists only when the ground pressure is higher than 400 kPa.
  9. As far I've counted mass restrictions for 16.9R24 tires (d = 1,333 m, b = 0,44 m), 0.35 ratio and 8 psi maximum ground pressure. 4x4 vehicle - 2,5 metric tons 6x6 vehicle - 3,5 metric tons 8x8 vehicle - 4,4 metric tons 10x10 vehicle - 5,2 metric tons 12x12 vehicle - 5,9 metric tons
  10. Axle load with this ground pressure will be much lower. I'll count that. MMP ground pressure formula (in metrics) K - constant dependent on number of axles and drive axles g - gravity (~9,8 m/s^2) m - weight of vehicle n - number of axles d - outer diameter of chosen tires b - width of chosen tires (o/h) - tire deflection to height ratio (usually between 0,15 and 0,35) And table regarding the choice of K ratio The top line - number of drive axles The side lide - number of axles Source: M. Saarilahti, Modelling of the wheel and tyre. 1. Tyre and soil contact, Soil Interaction Model. Appendix Report No. 5, s. 24-29
  11. What is "psft" in ground pressure requirements? Edit: This is pounds per square feet? But 8 psf is 380 Pa. The ground pressure of human and modern FAVs is ~55 - 70 kPa (8 to 10 psi). The very safe pressure for wheeled vehicles is 170 kPa (25 psi). In case of modern wheeled APCs is around 200 to 350 kPa (29 to 51 psi). In case of human with snowshoes it is ~700 Pa.
  12. Find 10 differences - unrealized Rosomak successor - Romanian Agilis planned to produce in cooperation with Rheinmetall
  13. And you don't even how thick are plates in ERAWA-2 and what is inside of them.
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