Royal Navy Evaluates Capstone UAS for Anti-Submarine Warfare

Certo Aerospace successfully showcased the anti-submarine warfare (ASW) capabilities of its Capstone rotary wing uncrewed aerial system (RWUAS) to the Royal Navy (RN) during a trial conducted on February 23, 2026, at Keevil Airfield in Wiltshire. This demonstration was part of the Atlantic Bastion technology program and aimed to explore how uncrewed systems could enhance the RN's operational reach in underwater warfare. The Capstone RWUAS, weighing 600 kg, was equipped to carry a mix of sonobuoys for over two hours, integrating General Dynamics Mission Systems UK's UYS-506 acoustic processor for real-time data processing and transmission.

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The trial extended beyond basic sonobuoy deployment, establishing a comprehensive ASW sensing chain that included data processing, transmission, and operator display. Operators were able to visualize underwater activity, including acoustic data and target tracking, through a ground control station linked to satellite communications via Starlink. The Capstone's design, featuring a coaxial rotor, allows it to operate effectively from ships with limited flight deck space, aligning with the RN's strategy to incorporate both crewed and uncrewed aviation.

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The Capstone UAS represents a potential low-cost solution to augment the RN's existing capabilities, particularly in ASW operations. Currently, the RN operates two Peregrine RWUAS systems, which are primarily used for surface intelligence, surveillance, and reconnaissance (ISR) tasks. In contrast, the Capstone's larger carrying capacity, with up to 14 sonobuoy dispensers, positions it as a more effective tool for ASW missions. Previous trials with other UAS, such as the Malloy Aeronautics T-600, have demonstrated the feasibility of deploying weaponry like the Sting Ray Torpedo.

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However, the future of such technologies hinges on the RN's funding for further development and acquisition. Reports indicate that the Ministry of Defence (MoD) is under pressure to identify £3.5 billion in savings, potentially delaying the Defence Investment Plan until summer 2026. This financial uncertainty raises concerns about the RN's ability to invest in promising technologies like the Capstone UAS.

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Critics argue that despite the promising capabilities of the Capstone UAS, the RN's financial constraints could hinder the effective integration of such systems into its operational framework. The emphasis on cost-saving measures may limit the RN's ability to fully explore and implement advanced technologies that could enhance its ASW capabilities.

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• “The trial highlights how uncrewed systems could play a more significant role in extending the RN’s reach in the underwater battlespace.” — Certo Aerospace Representative

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• “CAPSTONE has a larger carrying capacity with up to 14 sonobuoy dispensers, and this demonstration focused on the ASW mission.” — Royal Navy Official

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• “However much potential such technologies may have, they will count for little if the RN does not have the funds for further development and acquisition, even for relatively low-cost systems such as Capstone.” — Defence Analyst

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The evaluation of the Capstone UAS marks a significant step in the Royal Navy's exploration of uncrewed systems for ASW, yet the path forward remains uncertain amid financial challenges.

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