Armour vs altitude: India’s light tank dilemma along China border

The Zorawar is India’s new high-altitude light tank. The Defence Research and Development Organisation and Larsen & Toubro developed it for the Line of Actual Control with China. Its mission is to operate where heavier armoured vehicles cannot, including thin mountain air, narrow roads and areas with small bridges. That gives India a vehicle suited to the border’s difficult conditions.

In its base configuration, the Zorawar weighs about 25 tonnes. It carries a 105mm rifled gun in a Belgian-designed Cockerill turret. The tank is light enough to be flown to the border. Its 764-horsepower engine is intended for high-altitude operations, though thinner air can reduce power above 4,500 metres.

India plans an initial 59 tanks and 354 overall. The first public prototype appeared in 2024, and field firing trials met their intended objectives in desert terrain. However, armour upgrades could delay service entry from the original 2027 target to 2028–29.

The Zorawar weighs about 25 tonnes in its base configuration. India’s older Russian-origin T-72 and T-90 tanks weigh between 45 and 50 tonnes. That makes the Zorawar roughly 20 to 25 tonnes lighter, or about half the weight of the heavier tanks. The difference matters because mountain transport imposes strict limits on aircraft, roads and bridges.

India previously airlifted T-72s and T-90s to Ladakh during confrontations with China. Their weight makes deployment more demanding, especially across narrow roads and small bridges. The Zorawar is intended to be flown all the way to the Line of Actual Control. Its lighter design also targets high-altitude conditions where heavy tanks may be harder to operate and maintain.

The advantage is not absolute. Adding armour could increase the Zorawar’s weight by up to seven tonnes. That would reduce some of its transport and mobility benefits, while creating demands for a stronger engine and possible turret redesign.

High-altitude tank operations are difficult because several constraints act together. Thin air contains less oxygen, which can reduce engine performance. Steep terrain demands power and careful control. Narrow roads limit turning space and route choices. Small bridges may not safely carry heavier armoured vehicles. Together, these factors make movement, deployment and maintenance harder than on ordinary ground.

The article identifies operations above 4,500 metres as a particular challenge. At that height, thinner air could cause a 20 per cent drop in engine power. India previously moved 45-to-50-tonne T-72 and T-90 tanks into Ladakh, but questions remain about their performance in sub-zero, low-oxygen conditions. China’s lighter Type 15 is easier to run and maintain at altitude.

The Zorawar addresses these problems by keeping its base weight near 25 tonnes. That supports airlift and access to restricted routes. Yet protection upgrades could add seven tonnes, showing how quickly mountain mobility can be affected when a tank becomes heavier.

India’s central trade-off is protection versus mountain mobility. The Zorawar’s current turret is hardened against small arms fire and artillery shrapnel, but not armour-piercing rounds fired by Chinese autocannons. The army reportedly wants Nato STANAG Level 6 protection against 25mm and 30mm armour-piercing ammunition. That would improve survivability but change the vehicle substantially.

The extra armour could add up to seven tonnes. A heavier tank would be more difficult to airlift and move across narrow roads and small bridges. At more than 4,500 metres, its engine could also lose 20 per cent of its power because of thin air. Ashok Bhim Shivane said the 764-horsepower engine might need to become a 1,000-horsepower engine.

The upgrade could also exceed the Belgian turret’s capacity. Shivane said the turret could not take heavier armour. India would therefore face redesigns, a longer development cycle and a later entry into service, potentially in 2028–29 instead of 2027.

At altitudes above 4,500 metres, the Zorawar’s engine may not deliver its full rated output. The article says thinner air could cause a 20 per cent drop in engine power. That matters because a tank needs power to climb steep ground, cross difficult terrain and move effectively while carrying its crew, weapons and protection.

The current engine produces 764 horsepower. Ashok Bhim Shivane said it might need to be upgraded to 1,000 horsepower, especially if armour increases the tank’s weight by up to seven tonnes. More power would help compensate for both the thinner air and the heavier load. It would also support the tank’s ability to operate in high mountain areas.

An engine upgrade would not solve every design problem. The Belgian-designed turret may not accept heavier armour, and redesigns could extend development. India must therefore balance engine power, protection, weight and delivery speed. The army chief expects service entry in 2028–29, later than the original 2027 target.

The Zorawar does not have to replace India’s heavier tanks everywhere. Its role is to cover high-altitude areas where medium-category T-72 and T-90 tanks cannot reach or operate effectively. Heavier tanks could remain useful in other sectors, while Zorawars provide a lighter armoured presence near difficult roads, bridges and mountain positions.

The article points to a mixed force rather than an empty theatre. India previously airlifted T-72s and T-90s to Ladakh, while the Zorawar is intended for more constrained terrain. India plans 59 initial Zorawars and 354 overall. Sanjay Iyer argued that fielding the first tanks that had completed trials could be better than waiting for a heavier version that mostly exists on paper.

Ashok Bhim Shivane proposed a “spiral approach”. India could introduce a documented baseline, conduct instrumented trials and fund later upgrade lots. This would let crews train on real vehicles while gradually addressing vulnerabilities, instead of waiting for a fully upgraded design before deployment.

China already has a purpose-built high-altitude light tank in service. The Type 15 weighs 33–36 tonnes and has been operational since the end of 2018. The article says it is easier to run and maintain at altitude than India’s heavier T-72 and T-90 tanks. This gives China practical experience with a lighter vehicle suited to the Himalayan environment.

India previously relied on 45-to-50-tonne T-72s and T-90s, airlifting them to Ladakh during confrontations. The Zorawar is meant to close that capability gap. At about 25 tonnes, it can be flown to the Line of Actual Control and is designed for narrow roads, small bridges and thin mountain air.

The head start makes delay more serious. India’s army wants stronger protection against autocannon rounds, but added armour could force redesigns and delay service entry to 2028–29. Shivane called the requirement urgent and supported fielding tested tanks while upgrades proceed in stages.