A significant leap in India’s self-reliance in defence technology has been achieved with the successful development and testing of ramjet-propelled artillery shells by researchers at the Indian Institute of Technology (IIT) Madras. This innovation promises to extend the firing range of existing artillery systems by approximately 50%, offering a substantial advantage on the battlefield without the need for expensive new equipment. The project, a testament to the ‘Atmanirbar Bharat’ initiative, marks a pivotal moment in enhancing India’s military capabilities.
Revolutionizing Artillery with Ramjet Technology
For decades, increasing the range of artillery has been a key challenge for defence engineers. Traditional methods, like rocket-assisted projectiles, add complexity and cost. Incremental aerodynamic improvements offer limited gains. The IIT Madras team has taken a fundamentally different approach: integrating a ramjet engine directly into a standard 155mm artillery shell.
A ramjet is a remarkably simple engine – it has no moving parts. It generates thrust by utilizing the forward motion of the shell to compress incoming air, mixing it with fuel, and igniting the mixture. This sustained propulsion, unlike the brief boost from rockets, dramatically extends the shell’s flight path.
How Ramjet Shells Extend Range
The core innovation lies in replacing the conventional base-bleed unit within the artillery shell with a miniaturized ramjet engine. Base-bleed systems reduce drag, but offer a limited range increase. The ramjet, however, provides continuous thrust after the shell has left the gun barrel. This sustained acceleration allows the shell to travel significantly further, potentially altering tactical approaches to warfare.
This approach is particularly valuable because it doesn’t require modifications to the artillery guns themselves. Existing 155mm howitzers can fire these shells, making it a cost-effective upgrade for armed forces.
The Development and Testing Process
The project, initiated in 2020 in close collaboration with the Indian Army, has undergone rigorous testing in multiple phases. The initial proof-of-concept was demonstrated using a smaller 76mm gun developed at IIT Madras. This allowed the team to validate the fundamental principles of the ramjet propulsion system in a controlled environment.
Following the success of the 76mm trials, the research scaled up to the more commonly used 155mm artillery guns. Key milestones included:
- September 2025 – Deolali Trials: Successful demonstration of clean gun exit, stable flight, and, crucially, ramjet ignition. These trials validated both the internal and external ballistics of the new shell.
- December 2025 – Pokhran Field Firing Range: Further field trials confirmed the shell’s ability to exit the gun cleanly even at higher operational altitudes, a critical requirement for deployment in diverse terrains.
The project was led by a distinguished team of faculty at IIT Madras, including Prof PA Ramakrishna, along with contributions from retired Lt Gen P R Shankar and other experts.
Implications for Indian Defence and Beyond
The successful development of ramjet artillery has far-reaching implications for India’s defence preparedness. It offers a significant increase in range without the expense and complexity of new weapon systems or missile technology. This translates to:
- Enhanced Tactical Flexibility: Commanders will have the ability to engage targets at greater distances, providing a wider operational envelope.
- Deeper Strike Options: The increased range allows for pre-emptive strikes against enemy positions further behind the front lines.
- Improved Deterrence: A longer-range artillery capability strengthens India’s overall deterrent posture.
- Cost-Effectiveness: Upgrading existing shells is significantly cheaper than developing and deploying new missile systems.
However, the potential doesn’t stop at artillery. Prof. Ramakrishna highlighted the possibility of adapting this technology to rockets, promising even greater range enhancements. Projects exploring this avenue are already underway. This adaptability showcases the versatility of the underlying ramjet engine design.
A Model for Indigenous Defence Innovation
This project exemplifies the power of collaborative research between academic institutions and the armed forces. The ‘Professor of Practise’ program, introduced by the government, played a crucial role in facilitating this partnership, bringing real-world operational experience into the research process.
The IIT Madras team didn’t simply aim to replicate existing technologies; they reimagined how to improve upon them. By focusing on upgrading existing systems rather than developing entirely new ones, they’ve created a scalable and cost-efficient pathway for modernizing India’s artillery forces. This approach is a model for future indigenous defence innovation.
In conclusion, the development of ramjet-propelled artillery shells represents a major breakthrough in Indian defence technology. It’s a testament to the ingenuity of IIT Madras researchers and the effectiveness of the ‘Atmanirbar Bharat’ initiative. This innovation not only enhances India’s military capabilities but also positions the nation as a leader in global defence research, offering a compelling example of how academic excellence can directly contribute to national security. Further development and deployment of this technology promise to reshape the future of artillery warfare.
