India's HTT-40 Trainer: A Low-Cost Answer to Drone Threats?

India's HTT-40 Trainer: A Low-Cost Answer to Drone Threats?

India's HTT-40 trainer aircraft has been making waves in the defence community with its potential to become a low-cost airborne interceptor. The concept of upgrading this indigenous trainer into an armed platform has been gaining traction, particularly in the context of countering the rising threat posed by Shahed-style one-way attack drones.

The HTT-40, with its turboprop engine and relatively simple architecture, could be an ideal candidate for this role. Its top speed of around 450 km/h and service ceiling of approximately 6 km make it suitable for engaging relatively slow-moving unmanned aerial vehicles (UAVs). Moreover, its operational characteristics could lend themselves well to a secondary armed role, making it an attractive option for India's defence strategy.

One of the most compelling advantages of an HTT-40-based system is the kill ratio versus cost equation. The use of a sophisticated surface-to-air missile to take out a relatively inexpensive one-way attack drone could prove to be an unhealthy exchange ratio, especially if the adversary were to utilise drones in large numbers. A laser-guided 70 mm rocket, on the other hand, would provide an intermediate option, offering more precision than an unguided 70 mm rocket while being much simpler compared to an air-defence missile.

The domestic production of 70 mm rockets is underway, with Thales and Kalyani Strategic Systems Ltd (KSSL) having signed an alliance covering technology transfer, local production, and distribution of both unguided and laser-guided 70 mm rocket systems in India. The first fully assembled Indian-made rocket is due to come off the production line in early 2027.

An HTT-40-based system would be able to operate from dispersed and forward locations, adding another layer between the ground-based guns/electronic warfare systems and expensive missile interceptors. This would not only provide a cheaper layer of interception against appropriate targets but also leave high-end missiles for more demanding engagements.

India should conduct a feasibility study on the conversion of the trainer into an armed platform, including considerations of payload, endurance, sensor performance, rocket integration, and survivability. This would help determine the viability of the concept and identify potential challenges that need to be addressed.

In conclusion, the HTT-40 trainer aircraft has the potential to become a low-cost airborne interceptor, providing a cost-effective solution to India's drone threats. With the domestic production of 70 mm rockets underway, the timing is particularly auspicious for India to explore this option further. By leveraging this technology, India can enhance its aerial capabilities and provide a more effective response to the rising threat posed by drones.