pmaitra
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The fact that Arjun has a rifle makes it far more accurate than any comparable smoothbore. The reason why Abrams' smoothbore works very well is because it has excellent "avionics" to help it, which India lacks. I am borrowing the term avionics from aircraft, because there is no equivalent term for tanks.The Arjun does have a lot of weaknesses mentioned in this it lacks modern ammunition, a smoothbore gun, the sides are covered only by storage boxes, the ammunition in the Arjun Mk 1 is not isolated from the crew compartment, it has huge ballistic gaps in the frontal area, etc.
I will give you a few facts. Rifles work great with HEP/HESH and they are crucial in case of an Indo-Pak War. Rifles have difficulty firing Sabots, but manufacturing Sabots is extremely expensive. Even making sure every single round during the Sabot Petal separation works flawlessly requires extremely precise engineering. Moreover, HEP/HESH might not kill the occupants of an opponent tank, but it can very well disable it. Sure there are spall liners inside the crew compartment, but if a HEP/HESH hits the engine area, the main gun, or the exterior ammo storage, the tank would be disabled. A HEP/HESH is also crucial for taking out bunkers. Take away the vastly superior "avionics" of the Abrams, and the Arjun tank's rifle will prove to be far more accurate. Coming to shaped charge, the advantages of smoothbore over rifle are debatable.
Please read this excellent post, once again:
So, now you agree that Kanchan (a product developed for Arjun) is way more superior than T-90's armour. Ground Pressure is genuinely low by any standards given a tank of its size & volume & that's a feat of engineering excellence in itself. Increase in wight actually have NO effect on mobility, as you already know but are consistently trying to ignore. Crew-comfort is something you don't want to talk about because you do know that really matters in sustained operations. Rifling maybe old technique, but for firing HESH rounds (bunker-busting purposes & fortification demolition), it is better suited. Tanks like the abrams, lack a HE shell, or a multi-purpose HESH round, a critical limitation discovered in Iraq. Anyway, with chromium lining & several other modifications to main gun barrel, many limitations of rifling have been contained while preserving the accuracy benefits of the same. More volume also implies, larger APU & better sensor suite, a must have for today's net-centric battlefield.