Arjun Main Battle Tank (MBT)

[p2prada]

some of the pics should not have been their........................ people should think before posting these pics.

Nothing wrong with it. It is opsec only before induction. Once displayed in a public place, such small things are nothing.

He should have taken better pictures.

 

[Godless-Kafir]

Anymore info on Mark-2?

 

[Kunal Biswas]

Its very much Leo A4 from Inside..

Though the things he posted are not opsec, I have taken 35 pics of Arjun inside out but posted only 4-5, though there are no serious electronic photos he posted..

 

[Godless-Kafir]

looks like everything in the arjun MK-II graphic would come alive.

The new sight and automatic co-axial gun are of what origin? Did they say it is in house or imported?

Also the sensors are of Iron fist?

 

[Godless-Kafir]

Its very much Leo A4 from Inside..

Though the things he posted are not opsec, I have taken 35 pics of Arjun inside out but posted only 4-5, though there are no serious electronic photos he posted..

What are you waiting for then? Post away.

If you think there is some sensitive information then give me a password protected blog like Picassa so only the regular members can see.

 

[LurkerBaba]

A spinning projectile will have a less parabolic path than a non-spinning one.

This is true:

• in theory.
• in practise.

This is tue:

• for 7.62mm projectile.
• for 120mm projectile.

(yes...it's a late reply)

Globalsecurity has a good article on Fin Stabilized and Drag Stabilized projectiles. The Physics is relatively easy to understand

SPIN-STABILIZED PROJECTILES Most guns in use today use spin-stabilized projectiles. Spinning a projectile promotes flight stability. Spinning is obtained by firing the projectiles through a rifled tube. The projectile engages the rifling by means of a rotating band normally made of copper. The rotating band is engaged by the lands and grooves. At a nominal muzzle velocity of 2800 feet per second, spin rates on the order of 250 revolutions per second are encountered. Spin-stabilized projectiles are full bore (flush with the bore walls) and are limited approximately to a 5:1 length-to-diameter ratio. They perform very well at relatively low trajectories (less than 45� quadrant elevation). In high trajectory applications they tend to overstabilize (maintain the angle at which they were fired) and, therefore, do not follow the trajectory satisfactorily.

FIN-STABILIZED PROJECTILES These projectiles obtain stability through the use of fins located at the aft end of the projectile. Normally, four to six fins are employed. Additional stability is obtained by imparting some spin (approximately 20 revolutions/second) to the projectile by canting the leading edge of the fins. Fin-stabilized projectiles are very often subcaliber. A sabot, wood or metal fitted around the projectile, is used to center the projectile in the bore and provide a gas seal. Such projectiles vary from 10:1 to 15:1 in length-to-diameter ratio. Fin-stabilized projectiles are advantageous because they follow the trajectory very well at high-launch angles, and they can be designed with very low drag thereby increasing range and/or terminal velocity. However, fin-stabilized projectiles are disadvantageous because the extra length of the projectile must be accommodated and the payload volume is comparatively low in relation to the projectile length.

In contrast to conventional spin-stabilized projectiles which derive their in-flight stability from the gyroscopic forces resulting from the high rate of spin, the finned projectiles are stabilized during flight by aerodynamic forces acting on the projectile.

Although projectile spin does not contribute to the stabilization of finned projectiles, a low rate of roll around the longitudinal axis is desired to minimize the adverse effects of mass and configurational asymmetries which may result from material imperfections and from manufacturing tolerances.

Basically, Aerodynamic Drag Stabilization vs Gyroscopic Stabilization


Large Caliber Ammunition - Types of Projectiles

 

[pmaitra]

Thanks a lot LB. I wish I had found that article earlier. This one says it better than the way I did.

 

[utubekhiladi]

Crucial Arjun Mk.2 User Trials From June 1

On May 10, the improved Arjun Mk.2 main battle tank prototype is all set to roll into the Pokhran field firing range in Rajasthan for a week of firing trials. Formal user trials with the Indian Army are scheduled to commence on June 1. Much rides on the results of these trials, and expectations are high. At the very least, an indent -- or conditional intention to buy memorandum -- for 124 Mk.2 tanks depends on the tank performing on expected lines during these (and potentially, future rounds of) trials.

The Arjun Mk.2 trials come just weeks after Russia displayed an improved version of the T-90 tank at Defexpo 2012, and the timing is no coincidence. Russia has made it all but officially clear that the T-90 is superior in all respects to the Arjun, though this was hardly borne out in comparative trials between the Russian tank and an Arjun Mk.1 in 2010 (the DRDO says the Russian tank was uniformly drubbed). It isn't difficult to see, however, that the Arjun's loss is the T-90's gain, and vice versa. It is at this juncture and this atmosphere that the Arjun Mk.2 trials are set to commence, and for these reasons that they will be watched closely by stakeholders. Also:

* If the Arjun Mk.2 is not a success, the overall Arjun programme will be a dead loss, since the programme needs a minimum supply order, overall, of 500 tanks to amortize project costs.

* The T-90 license build programme hasn't been without problems, and years after the production line came up, there remain issues.

* The Arjun Mk.2 is crucial in every respect to the Army's faith and confidence in the FMBT that it wants from the DRDO.

The heavier Arjun Mk.2 incorporates some 93 improvements on the Mk.1 tank, 124 of which are already in operational service in two tank regiments in the Army.

Personally, nothing would be more satisfying than to see the Arjun Mk.2 meet all requirements. It is truly sad that India has to continue to cookie-cut Russian tanks at great cost, especially at a time when the paradigm of the land battle is in a process of deep transformation anyway.

Livefist: Crucial Arjun Mk.2 User Trials From June 1

 

[agentperry]

we all know that russian t-90 tanks which were bought by India in huge numbers are nowhere to be seen.
the 1000 tanks to be produced in india and rest 310 are far from being inducted or even produced.

if arjun mk 2 is delivered before the trouble t-90 is given gets resolved then i guess the contract with russia can be cancelled in favor of same or more no of arjun mk2

 

[john70]

Arjun Mk-II Gets Ready To Compete Russian T-90 Tank

Arjun Mk-II Gets Ready To Compete Russian T-90 Tank Thursday, May 03, 2012 By : Defence News Admin

A prototype of the improved main Arjun Mk-II battle tank is now fully ready for field shooting tests. A prototype of the improved main Arjun Mk-II battle tank is now fully ready for field shooting tests.

The field trials are stated to be carried out at the Pokhran firing range in the state of Rajastan. The Indian army will commence testing on the 1st of June 2012.

The declaration of the testing of the Arjun Mk-II prototype comes a few weeks after Russia presented an improved version of the T-90 tank at the Defexpo 2012 exhibition in New Delhi. The timing is no coincidence and DRDO is aggressively building a tank that can outclass one of the best tanks in the world. Russia has done everything to prove that it's T-90 surpasses the Arjun in all respects and DRDO is clearly not in a mood to accept that.

According to India's DRDO (Defence Research and Development Organisation), a comparison of the T-90's latest version with the Arjun Mk-I in 2010 showed that the former was inferior in a number of areas.

There is a clear-cut correspondence: every order the Arjun loses directly benefits the T-90 and vice versa. This will set the stage for the tests of the Arjun Mk-II, which is why the interested parties will pay very close attention to both the Arjun Mk-II and the T-90s.

The Indian Army's decision to purchase these sophisticated tanks in large numbers will depend on the overall comparative analysis. The Indian military plans to buy 124 Mk-II units in the initial stage, if the tests go smoothly.

 

[sayareakd]

T 90s and Arjun MK-II, development is mere coincidence, both have somehow come at the same time, with different featurs, hope this with benifit IA.

 

[pmaitra]

I don't want to see this as either this or that, but I will pray for the success of Arjun MK-II.

Fingers-Crossed!

 

[sayareakd]

new sight on MK-II is good, much better then old one, but i think our tanks and bmp deserves good sight, that will give all round picture to crew.

 

[lemontree]

Hope the Arjun II clobbers the T-90, especially in the night firing trials.

 

[sesha_maruthi27]

Hope the RUSSIAN MAFIA does not try to do any mischief to bring down ARJUN MK-II........

 

[sayareakd]

Hope the RUSSIAN MAFIA does not try to do any mischief to bring down ARJUN MK-II........

They have himen and agents in India.

 

[sayareakd]

Hope the Arjun II clobbers the T-90, especially in the night firing trials.

Sir it hsd good thermal sight, we dont know much about T90 s sight. Plus MK-II has new optical sight you can watch only video of MK-II on defexpo thread.

 

[Ray]

It really does not matter who has agents or not.

What matters is what the IA feels about it.

Their lives will be up for the grabs and so their views should be paramount!

With the way the defence procurement is under the lens, reality should prevail.

Let the best tank win!

 

[Rahul Singh]

Why this fuss, what is left of Arjun to prove against T-90? T-90 is what it was against Mk-1 and we all know the results. After that Arjun has been further improved but what has been in T-90S? Media; both Indian and Russian, is making useless fuss calling it competitive trial which in reality is validation cum user trial. Arjun has proven its superiority and if coming trial is anywhere near re-proving that then Avadi should be asked to officially halt-unofficially dump T-90 production.

 

[Damian]

Arjun has proven its superiority

When? That latest test was obviously fishy thing when we consider all that political hype around Arjun. I explained it in another thread and taking in to consideration Arjun design, I highly doubt that it would be better than any tank made in a country with bigger experience in AFV's designing.

If someone would be fair here then tests should be performed with independent observers besides both competing sides supporters.

What bothers me is from what we know, designers didn't worked out basic weaknesses in Arjun design, like turret side armor, main sight placement, size of gun mantle, things that in XXI century should not be presented on 3rd generation MBT. Instead they focused on adding all these electronic gizmos that will not nececary help, for example that radar thing, placed on turret front armor prevents any armor upgrade there and is placed in the most exposed to enemy fire place. If this is how it would be on production vehicle then... I don't even know what to think about it.

Further they stick with rifled gun, I do not know why, when in anti armor role it is obsolete, and in mutlipurpose role smoothbore guns offer better than HESH ammunition.

And there is something more, Ukraine try to propose India their own upgrade for T-90S based on T-84M Oplot, if India would adopt this upgrade then T-90S will be clearly superior... on the other hand India can also adopt T-90MS with the same effect.

However Ukraine that desperatly needs export orders for T-84M, can offer this very good and dangerous tank to Pakistan... with current gun and ammunition both Arjun and T-90S allready will have problems with Pakistani T-80UD's. As it was discussed earlier, that problem could have been solved long time ago, if someone would for example thing to buy licence for Israeli smoothbore gun and buy better APFSDS ammunition from Israel or NATO (IRCC DM53 or DM63 can be buyed from Germany or KEW-A1 and KEW-A2 from US, KEW-A2 seems to be tungsten analog to M829A2 that is designd to defeat composite armors with heavy ERA, DM53/63 can also do that).

And currently views aren't that good, because not only Pakistani T-80UD's have heavy ERA (still based on 4S22 Kontakt-5 as it seems), but also Chinese tanks and Pakistani Al Khalids have heavy ERA. Both T-90S and Arjun will not be capable to defeat such protection with one shot. Also T-90S is better protected than Arjun when we consider vehicle size and weight, placement, exposure and size of weak zones. This makes situation problematic.

Russians and Ukrainians do not offer very long rods for their APFSDS ammunition and very long rods won't nececary fits in to currently used autoloaders, while Arjun in theory can use very long rods, nobody manufacture such APFSDS ammunition for rifled guns, while it is possible to place such rod in different sabot so it can be effectively fired from a rifled gun, it seems that nobody bothered to do that, or Indian decision makers didn't make any real order for such ammunition, while IMI only company that was considering to make such ammunition for India, was blacklisted.

So while everyone is happy because Arjun Mk2 will be tested, details shows that situation is not nececary bright.