Tanks guns and ammunition.

[FORMATOSE]

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 ) :

 

 

[LoooSeR]

   Korean APFSDS for 105 and 120 mm guns. K279 can punch through 700mm RHA according to pics.

 

https://m.weibo.cn/status/4436292294980190

[LoooSeR]

http://otvaga2004.mybb.ru/viewtopic.php?id=1988&p=30#p1269585

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

https://npo.conf.nstu.ru/arhiv

 

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.

 

https://npo.conf.nstu.ru/file/2019/book2019_2.pdf 

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

 

Spoiler

   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.

 

Quote

   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.

 

Spoiler

 

Quote

   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.

 

[VPZ]

Alliant Techsystems Operations to produce M829A4 120mm APFSDS rounds

Quote

 

Alliant Techsystems Operations LLC, Plymouth, Minnesota, was awarded a $100,294,127 firm-fixed-price contract for the production of the M829A4 120mm Armor Piercing, Fin Stabilized, Discarding Sabot (APFSDS) with Tracer cartridge.

---

120mm round with APFSDS head (Picture source: Wikipedia)

---

One bid was solicited via the internet with one bid received. Work will be performed in Plymouth, Minnesota; Keyse, West Virginia; Morgan Hill, California; Jonesborough, Tennessee; Elk River, Minnesota; Coachelle, California; and Aschau, Germany, with an estimated completion date of Feb. 26, 2022. Fiscal 2018 and 2019 procurement of ammunition, Army funds in the amount of $100,294,127 were obligated at the time of the award. U.S. Army Contracting Command, New Jersey, is the contracting activity (W15QKN-20-C-0002).

The M829 is an American armor-piercing, fin-stabilized, discarding sabot (APFSDS) tank round. Modeling was designed at the Ballistic Research Laboratory (BRL) at Aberdeen Proving Ground (APG), which was incorporated into the Army Research Laboratory (ARL) in 1992. The round is specifically modeled for the 120mm M256 main gun on the Abrams M1A1 and M1A2 main battle tanks. The penetrator is carried by a sabot during its acceleration in the gun barrel.

 

 

https://www.armyrecognition.com/december_2019_global_defense_security_army_news_industry/alliant_techsystems_operations_to_produce_m829a4_120mm_apfsds_rounds.html

[Ramlaen]

Barrel cutaway.

 

 

 

[Ramlaen]

 

[Beer]

Will DRDO finish the development before those tanks are phased out? 

[LoooSeR]

 

[Gun Ready]

19 hours ago, LoooSeR said:

 

Question: do you know the meaning of the purple and red rings?

[Ramlaen]

Couple more shots from that display at Army2019.

 

[Ramlaen]

If I understand the naming scheme correctly for 30x173mm.

Mk310 programmable airburst = XM1182 HEAB

Mk239 TP = XM1173 TP

Mk238 HEI = XM1171 HEI

Mk317 TPDS = XM1172 TPDS

Mk258 APFSDS = XM1170 APFSDS

[LoooSeR]

Quote

Self-forming Projectile of ZEPL-Target Detecting Sub Munition for modern Artillery Systems.

Stolen from otvaga

[Wiedzmin]

[Wiedzmin]

 

http://bastion-karpenko.ru/3vbm23/

[LoooSeR]

   For english speakers - 125 mm 3VBM23 shot with 3BM60 APFSDS for 2A46M type cannon. 3BM60 IIRC is Svinets-2

• Weight of the shot - 22 kg
• Weight of the projectile - 8.4 kg
• Projectile length - 735 mm
• Height of the propellant charge - 410 mm
• Muzzle velocity - 1660 m/s
• Operating temperature range - -40...+40 degr. C.
• Thickness of homogeneous armor penetrated at 60 degr. angle from normal at 2000m range - 300 mm

[alanch90]

22 hours ago, LoooSeR said:

• Thickness of homogeneous armor penetrated at 60 degr. angle from normal at 2000m range - 300 mm

A little lower than what was claimed before, right?

[LoooSeR]

2 hours ago, alanch90 said:

A little lower than what was claimed before, right?

   What you mean under "before"? They are photos posted here eariler, showing 600 mm pen (at 90 degr)

[alanch90]

23 minutes ago, LoooSeR said:

   What you mean under "before"? They are photos posted here eariler, showing 600 mm pen (at 90 degr)

By before i mean this (which of course i never could verify its authenticity) 

[LoooSeR]

7 minutes ago, alanch90 said:

By before i mean this (which of course i never couldn´t verify its authenticity) 

   Well, those shells are "in development" section, so those are napkin numbers. Paper can survive even bigger penetration numbers 

[alanch90]

3 minutes ago, LoooSeR said:

   Well, those shells are "in development" section, so those are napkin numbers. Paper can survive even bigger penetration numbers 

Yeah and there are other fishi things with that picture. But in any case perhaps the public performance of "600mm" for Svinets-2 is just an absolute minimum since western tanks have had stronger turrets than that for many years, even decades. On the other hand i can´t imagine how the projectile is adapted to defeat ERA (it doesn´t pack the same kinetic energy as DM53 or M829A3). 

[Militarysta]

15 hours ago, alanch90 said:

A little lower than what was claimed before, right?

Yes, and no :-)

 

Remember that wester norms are based on 50% + 1 penetration norm for sucht level, and estern (and former WarPac) are ussaly 75%+1 penetration for sucht level.

What's difffrent?

DM33A1 accoding to polish WITU has 470mm RHA for 2000m (60 slopped) in western - ca 500- 510mm. The difrence is circa 8%.

Maybe this  600mm @60. is for 75%+1 norm so circa  650mm for 50%+1?

 

And the most importatnt - penetration level of "mm RHA" is BS.  It's completly not relevant. 

[alanch90]

Well yes, the claimed number to me is suspiciously low, since the weight and dimensions of BM60 are virtually the same as DM-53 while muzzle velocity is only 100m/s lower than  the german round fired from L55 gun and virtually the same as when fired from the L44. And the penetration of DM-53 is claimed as 700-650 respectively.

What i find curious is the claim that BM60 defeats ERA (2nd gen? 3rd gen?), perhaps its segmented as DM-53?

[Militarysta]

Soviet's since ca 1982 where looking abilities to overcome NERA armour and NxRA - so 3BM26 3BM26 and finally 3BM42 and 32. But in end of the 80's main arour where switched from NERA/Nxra layout to ceramics - and IMHO it's dffrent problems for main armour.

Again - nothing to compare to "stupid mm RHA"

It was in sucht schape on former Soviet Unionf

(sorry - source I will let to myself)

Impossiblu?

One of the T-80UD turret armour - orange  - ceramics,bluse -RHA,  heavy blue - HHS plate, light blue -cast:

A lot of RHA and HHS and Ceramics. And 4s22 before that.

 

(again -shitty quality of the image by purpose)

 

[TWMSR]

alanch90,

note that "only 100 m/s" lower velocity means about 1800 meters difference in anti-armour performance between faster and slower projectiles versus same, specified target.

 

Militarysta,

there is general agreement on obsolescence of RHA equivalent as a way to define projectile performance, from many various reasons. On the other hand there is nothing better we have. Commonly accepted standard, namely NATO targets, are even more archaic, since those arrays today can be pierced probably from 20+ kms. RHA equivalent remains a bit more useful,  because it gives some numbers that could be compared with other numbers, of another ammunition types. It is also easier to imagine penetrating power in millimeters/inches than in km/miles. Last but not least, RHA equivalent is still used by producers of ammunition.

 

Let say it, that chart was made in Unterluss

[alanch90]

5 minutes ago, TWMSR said:

alanch90,

note that "only 100 m/s" lower velocity means about 1800 meters difference in anti-armour performance between faster and slower projectiles versus same, specified target.

Sorry i meant to say that the difference in velocity is almost non existant when DM53 is fired from L44 gun (1670 m/s).