Proteus: Forging the future of autonomous rotorcraft

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The flagship project in this domain is Leonardo’s Proteus, a technology demonstrator that will test and verify advances in payload modularity, autonomy and the latest rotorcraft design and production methods.

Proteus forms a key pillar of the Royal Navy’s Maritime Aviation Transformation (MATx) strategy. This will utilise uncrewed systems where possible and crewed platforms where necessary, to build mass at sea and support anti-submarine warfare missions. MATx is in line with the wider UK Armed Forces approach laid out by the Government’s recent Strategic Defence Review and Defence Investment Plan, moving to a model where each service employs a mix of crewed, uncrewed and autonomous systems.

In July 2022, Leonardo was awarded a four-year, £60 million contract for the RWUAS Phase 3A Technology Demonstrator Programme, now known as Proteus. This is seeing the development of a c3t Technology Demonstrator with inherent modularity and autonomy, designed, developed and manufactured in Yeovil, UK. The demonstrator made its first flight in January 2026.

Modularity

Leonardo is developing Proteus to transform the way effects are delivered on future operations, enabling optimal capability to be provided by a single platform. An innovative modular payload concept has been developed that substantially changes the way that mission equipment is integrated.

A large modular payload bay is sized for the carriage of two standard NATO pallets or 1,000kg of payload in the initial Proteus technology demonstrator aircraft, with the ambition to raise this to a more than 50% payload capability for future production aircraft.

Leonardo’s innovative approach to the development of containerised open systems architecture for uncrewed rotorcraft mission systems will facilitate the rapid integration of customer-specific payloads, without the need for significant integration programmes.

Autonomy

As the Royal Navy looks to deliver its MATx strategy, which covers maritime aviation until 2040, it is doing so against the backdrop of shrinking budgets and a reduction in force size, as well as growing concerns relating to the threats posed by hostile nations.

Autonomy will be a major part of how this circle is squared. The strategic importance of the technology was reinforced in the government’s Strategic Defence Review, which stated that “drones, AI and autonomy” would complement aircraft, ships and artillery as part of the “new vision for how our Armed Forces should be conceived – a combination of conventional and digital warfighters.”

Autonomy brings a number of benefits. For example, the challenge of recruiting and retaining military personnel can be addressed by aircraft that can operate without the need for operators throughout their missions.

Autonomous platforms can also bring cost benefits compared to crewed helicopters, because they are less complex and require less avionic equipment. Since there are no crew controlling the aircraft, mechanical control runs, seats and displays are all unnecessary.

Proteus will enable the Royal Navy to deploy large numbers of rotorcraft, generating mass, for long periods, autonomously handling dull, dirty and dangerous missions. Searching for submarines in the dark, in the rain, in heavy North Atlantic seas for hours and hours at a time, is a challenging situation to be in. If an uncrewed aircraft can do that mission by itself, for longer because it can carry fuel instead of people, and staying fully focused on the task throughout, it will deliver a significant and positive advance in how the Royal Navy conducts operations.

Bringing autonomy to life

Seeing is believing and Leonardo has demonstrated significant progress in autonomy in its proprietary synthetic environment. In May 2025, the company delivered its latest demonstration to the Royal Navy: introducing objective-based automatic mission planning, with task management and the handover of tasks between three aircraft in the synthetic environment. This featured wide-area surveillance, integrating a multitude of sensors including electro-optical, radar and AIS data.

Through data fusion, the aircraft established a situational awareness picture of what was around it, ultimately allowing it to feed back to a naval combat management system. In a real operation, that autonomously generated tactical picture could then be used by Royal Navy commanders to inform their strategic decisions.

The future

Having achieved the first flight of Proteus in 2026, Leonardo will continue collaborating with the UK MOD and Royal Navy on the development of the autonomous functionality that will enable the delivery of a Hybrid Navy.

Beyond the current project, Leonardo is open to collaborating internationally on autonomous rotorcraft development and payload modularity. The company believes that a future iteration of the Proteus capability is likely to be of significant interest to maritime and land armed forces around the world.

Find out more about Proteus and the future of autonomous rotorcraft