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The United Kingdom has completed the maiden autonomous flight of its first full-size unmanned helicopter. The helicopter, named Proteus, is intended to operate alongside crewed helicopters as part of the Royal Navy’s future aviation.

Proteus has been designed and built in Yeovil by Leonardo UK as part of a program valued at approximately $76 million. The aircraft completed its first autonomous flight on January 16, 2026, at Predannack Airfield in Cornwall, following several weeks of ground testing.

The flight marked the transition of the Proteus program from ground trials to airborne testing. During the sortie, the helicopter controlled its own flight systems without a pilot onboard, while remaining under continuous supervision by ground-based test pilots to manage safety.

The flight took place at Predannack Airfield, a satellite facility supporting Royal Navy helicopters based at RNAS Culdrose near Helston. Predannack also serves as the UK’s National Drone Hub, providing infrastructure for testing uncrewed and autonomous aerial systems linked to naval operations.

Engineers, technicians, and representatives from Leonardo, the Royal Navy, and UK defense innovation bodies were present to observe the flight. Before the flight, Proteus underwent a series of ground-running trials in December 2025 at Leonardo’s Yeovil facility. These tests progressively validated the helicopter’s engines, sensors, and onboard systems before flight clearance was granted.

Minister for Defense Readiness and Industry, Luke Pollard, described the flight as a significant achievement for the UK’s defense sector. “This maiden flight is a proud moment for British innovation,” he said.

Pollard highlighted that “Proteus supports skilled UK jobs while helping deliver the hybrid navy outlined in our strategic defense review,” adding that, “Autonomous systems like this will be vital in protecting our seas without putting personnel in harm’s way.”

🚁 Liftoff!

The UK’s first autonomous full-size helicopter, #Proteus, has completed a historic maiden flight at Predannack airfield in Cornwall.

Designed and built by #Leonardo in Yeovil, the Home of British Helicopters, Proteus is a major step forward in autonomous maritime… pic.twitter.com/nqZ9Qyp23Z

— Leonardo Helicopters (@LDO_Helicopters) January 16, 2026

Managing Director of Helicopters UK at Leonardo, Nigel Colman, said the program represents a major shift in maritime aviation capability. “Proteus represents a step-change in how maritime aviation can deliver persistence, adaptability, and reach,” Colman said.

Proteus Program

The Proteus program traces its origins to August 2013, when the UK Ministry of Defense awarded a two-year contract worth approximately $2.9 million to AgustaWestland, now part of Leonardo, to explore a Rotary Wing Unmanned Air System under the Anti-Submarine Warfare Spearhead program.

Early work focused on the SW-4 Solo uncrewed helicopter, derived from the PZL SW-4 Puszczyk, which was used to test autonomous flight control, ship integration concepts, and mission systems.

In 2017, a second development phase began under a contract valued at around $10.2 million, jointly funded by Leonardo and the Ministry of Defense. This phase expanded work on autonomy, mission relevance, and operational concepts for uncrewed rotary-wing platforms.

A major step occurred in July 2022 with the signing of a four-year contract valued at approximately $76 million. This agreement enabled the construction of the Proteus demonstrator and positioned it as one of the world’s first full-size autonomous helicopters, alongside the US-developed S-70UAS U-Hawk.

Design Concept and Role

The name Proteus is drawn from Greek mythology, referring to a shape-shifting sea god. The name reflects the helicopter’s modular design and its ability to adapt to different missions through reconfigurable payloads and autonomous behaviors.

Proteus has been designed as a technology demonstrator rather than an operational fleet asset. Its purpose is to explore how large uncrewed helicopters could be integrated into Royal Navy aviation, particularly within mixed formations where autonomous and crewed platforms operate together as part of a future hybrid air wing.

The program aligns with objectives outlined in the UK’s Strategic Defense Review, which calls for the development of a New Hybrid Navy. Autonomous helicopters are expected to play a central role in hybrid air wings and in the Atlantic Bastion program, which focuses on securing the North Atlantic.

Maritime Mission Focus

Proteus has been developed over more than a decade to support a wide range of maritime missions, with particular emphasis on anti-submarine warfare support and sea patrol operations.

In this role, the helicopter is intended to operate as part of a wider network, sharing data with allied ships, crewed helicopters, submarines, and other detection systems.

The focus is on persistence and wide-area coverage, allowing uncrewed platforms to take on tasks that would otherwise require sustained use of crewed aircraft.

The helicopter’s payload architecture is designed to accommodate maritime search radars, electro-optical and infrared sensor turrets, magnetic anomaly detection equipment, sonobuoy deployment and reception systems, electronic support measures, and communications relay payloads.

Airframe and Digital Engineering

The external design of Proteus was revealed in January 2025. Structurally, the aircraft is based on the Kopter AW09 light single-engine helicopter airframe, modified for autonomous operation and increased payload capacity.

Proteus features a five-bladed main rotor and a shrouded anti-torque tail rotor. More than 40 components in the airframe are manufactured from advanced composite materials, reducing weight and improving durability in corrosive maritime environments.

The traditional cockpit and cabin have been replaced with sensors, computers, and software systems. These allow the aircraft to perceive its surroundings, process information, make decisions, and execute actions without a human on board.

Autonomy Architecture

The helicopter’s autonomy architecture is built around an integrated flight control and mission management system with multiple layers of redundancy.

The system incorporates inertial measurement units, global navigation satellite system receivers, air data computers, and obstacle-detection sensors such as lidar or radar. These inputs are processed through sensor-fusion computers that combine navigation data with terrain, atmospheric, and flight-state models to generate real-time situational awareness.

The autonomy software is structured hierarchically. At the lowest level, control laws manage rotorcraft stability, attitude, and responses to wind and turbulence. Navigation functions handle waypoint following, geofencing, and route adjustments. At the highest level, mission management governs task sequencing, sensor operation, and coordination with external platforms via datalinks.

Future Testing

Proteus represents a significant step beyond the Royal Navy’s existing uncrewed systems, such as Malloy octocopters and the Peregrine uncrewed helicopter used primarily for surveillance.

Designed with a payload capacity exceeding one ton, the helicopter is intended to support higher-end mission sets and operate in demanding weather conditions, including high sea states and strong winds.

While official maximum take-off weight figures have not been disclosed, the demonstrator is consistent with a three-ton class vehicle when configured for autonomous operations.

As flight testing continues, data gathered from Proteus is expected to inform future UK decisions on integrating autonomous rotary-wing aircraft into Royal Navy and NATO maritime operations.