Barrus partners with Chartwell Marine to modernise and re-engine 7.8m RHIB

Southampton, 8th June, 2026—Barrus, one of the UK’s leading suppliers of marine engines has partnered with Chartwell Marine, a trusted pioneer of next-generation vessel design, to undertake a feasibility study exploring the modernisation of existing RHIBs through the integration of alternative propulsion systems.

The study aimed to determine whether the Cox CXO300 diesel outboard could be successfully retrofitted, assessing the engineering implications of integrating the propulsion system within the existing vessel architecture.

Barrus, as the authorised UK & Ireland distributor of Cox Marine diesel outboard engines, commissioned the study in collaboration with Cox Marine and Chartwell, selected for its expertise in propulsion engineering and vessel design.

Chartwell undertook a comprehensive evaluation of the RHIB, assessing single and twin CXO300 configurations across structural integrity, weight and trim, performance predictions, and installation requirements. The study concluded that a single CXO300 installation is the preferred solution, offering performance comparable to previous configurations with minimal modification to the existing vessel.

The repowering study provides operators considering such transitions with a clear, evidence-based understanding of the requirements involved. The switch from petrol to diesel reduces flammability risk during vessel transportation, extends servicing intervals, and provides a more operationally efficient propulsion solution for demanding roles. The scope of work also included high-quality marketing renders and detailed general arrangement drawings, supporting Barrus and Cox Marine in communicating the solution to their customers.

Daniel Shephard, Business Development Manager at Barrus, said: “This study provided valuable insight into integrating alternative propulsion systems within existing vessels. Working with Chartwell Marine, we gained a practical understanding of vessel repowering requirements to extend asset life, improve efficiency, and reduce costs. The assessment identified the Cox 300hp Diesel Outboard as a strong repowering option, offering high torque, fuel efficiency, diesel compatibility, and durability. These findings support informed propulsion-upgrade decisions focused on sustainability, efficiency, and asset optimisation .”

Toby Freeman, Senior Naval Architect, Chartwell Marine, said: “This project is a strong example of the practical, client-focused consultancy Chartwell Marine delivers. Working closely with the team at Barrus, we were able to navigate the engineering challenges of integrating a high-performance diesel outboard into an existing platform, while keeping modifications to a minimum.”