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On 10/31/2019 at 10:28 AM, That_Baka said:

Longer APDSFS ,Bigger Propellant Charge.


Based on the drawings, the propellant charges do not appear to be larger.


Note that all of the D-91T (2A66) ammunition seemed to use the same propellant charge (the markings refer to the 4Zh77 charge) with the exception of the 9M125 GLATGM.



Now switching topics a bit,


Israeli 105 mm M111 (Hetz-6) and M413 penetrators (Hetz-7 ? @Mighty_Zuk ) :





Conversion of M152/3 (Israeli licensed copy of the M456 HEAT-T) to the M152/6 (FUZAMAN airburst fuze, can also be adapted to the 120 mm M325 HEAT-MP-T ) :




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   Bunch of interesting stuff posted by tankoff from the materials of the conference "Science. Industry. Defense.".



30 mm AP round with solid-fuel jet engines

https://npo.conf.nstu.ru/file/2017_2.pdf (page 9-14)


   4 engines per round, tungsten core.



   Telescopic catridges for 40 mm ACs. Page 141-146.





   Simulation against BMP-3's armor.


   Page 178-181 of that document

   Development of radio-transparent ammunition for 57 mm ACs. 


   Variants of rounds made out proposed materials with ready fragments.



   To ensure the radio transparency of ammunition, it is necessary to use composite materials, the most suitable of which are: basalt fiber, fiberglass, carbon fiber. Such materials have low dielectric constant and dielectric loss tangent, which ensures efficient dispersion of the radio signal. While the magnitude of the reflected signal in metal structures is large, in the named polymers it takes values from 0.001 to 5 percent.

   Based on the analysis, basalt fiber has the best properties, since it has the highest melting point and strength. Also, the production of continuous basalt fiber is much cheaper than other materials under consideration.



   That one is a bit unusual - HEAT warhead inside of APFSDS, without explosive filler. Page 190. Uses unusual form inside of a rod, lined with copper and pressure from APFSDS rod to actuate HEAT jet. Proposed to increase penetration of main round.







   When such an armor-piercing core passes through the armor, it is compressed by the armor material in the comprehensive compression zone, as can be seen in Figure 3. As a result, an elastic-plastic compression wave runs through the armor-piercing core, which collapses the ellipsoid cavity lined with copper, due to which it forms at some focal length distance (F) is a cumulative stream of copper cladding and having a speed above 5000m / s. Which provides additional penetration of the armor and increases the probability of destroying the target.


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