By N. C. Bipindra

New Delhi: India has formally signalled a decisive shift toward strategic self-reliance in unmanned warfare, unveiling an ambitious plan to develop advanced long-range drones and a new 150-kilogram loitering munition powered entirely by an indigenous Wankel rotary engine.

The initiative marks one of the strongest pushes yet to eliminate dependence on foreign propulsion systems, a critical vulnerability that has long constrained India’s UAV programmes despite major advances in sensors, autonomy, and airframes.

At the centre of this effort is a next-generation Loitering Munition-UAV hybrid being co-developed by CSIR-National Aerospace Laboratories (CSIR-NAL) and Solar Defence & Aerospace Ltd (SDAL).

Early specifications indicate a standoff strike range of approximately 900 km and airborne endurance of up to nine hours, placing it squarely in the long-loiter, deep-strike category.

If validated during flight trials, the platform would deliver persistent surveillance, precision engagement, and real-time targeting flexibility, capabilities traditionally dominated by foreign suppliers.

The partnership between CSIR-NAL and SDAL is strategically significant. For the first time, CSIR has involved a private company from the inception of a project of national security importance, marking a shift away from a PSU-dominated development ecosystem toward a hybrid model that leverages state-backed R&D and private-sector agility.

SDAL was selected through the Combined Technical-cum-Commercial Bidding System, outperforming four other firms, including multinational defence players and major DPSUs.

The selection underscores the company’s growing technical credibility and signals a broader trust in private industry to deliver complex unmanned systems.

Union Minister of State for Science & Technology, Dr. Jitendra Singh, lauded CSIR’s new model of involving an industry partner from the conception stage, a first-of-its-kind approach for strategically important defence projects.

He emphasised that collaborating with industry from day one will accelerate development timelines and strengthen India’s unmanned systems ecosystem.

Wankel rotary engines — compact, lightweight and mechanically simpler than piston engines — are a global favourite for UAV propulsion due to their high power-to-weight ratio and low vibration signature.

But India has historically relied on imports for such engines. By indigenising this critical capability, India aims to secure its UAV supply chain, reduce exposure to geopolitical pressure, and integrate propulsion more tightly with its classified mission systems.

The NAL-developed Wankel engine selected for the LM-UAV has already cleared CEMILAC certification for aircraft integration and flight testing, demonstrating readiness for accelerated development.

The implications extend beyond a single platform. A successful indigenous Wankel programme could catalyse a new domestic value chain — from apex-seal manufacturing to thermal-resistant rotor housings and engine-control electronics — benefitting both public and private defence companies.

It could also position India as a potential exporter of propulsion systems and long-endurance UAVs to countries seeking non-Western suppliers.

Operationally, long-endurance, low-RCS loitering munitions fill a critical tactical gap. They offer the ability to track, surveil, and strike time-sensitive targets without risking aircrew, while operating effectively in GPS-denied environments, a capability increasingly relevant in modern contested zones.

The LM-UAV’s AI-enabled EO-IR payload will further enhance Detection, Recognition, and Identification performance, enabling high-precision engagement even in dynamic conditions.

Yet, challenges remain. Wankel engines are notoriously demanding in terms of material science, sealing precision, rotor-housing temperature control, and fuel calibration.

Achieving the promised 900-km range will require meticulous optimisation of aerodynamics, fuel efficiency, and mission profiles. Prototype trials, thermal benchmarks, and endurance validation will determine whether India can translate its aspirations into field-ready capability.

For now, the programme delivers a clear message: India intends to own the propulsion technologies that shape the future of long-range unmanned warfare.

If the LM-UAV meets its targets and progresses to scaled production, it could become the foundation for a family of indigenous drones—ranging from maritime surveillance platforms to swarm coordinators and heavier loitering systems, reducing strategic vulnerability and enhancing India’s regional technological influence.

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