Coral Ocean
73m Motor Yacht | Lürssen
BMComposites engineered and installed a new 140m² carbon fibre roof structure for this 73m Lürssen, transforming her upper deck into an enclosed Sky Lounge.
The Brief
BMComposites was commissioned to engineer, build and install a new composite roof structure for the upper deck of Coral Ocean, a 73m motor yacht built by Lürssen and designed by Bannenberg & Rowell. At 30 years old, the yacht was undergoing a significant refit, and the brief called for a 140m² structure to replace an existing satellite dome technical area, creating an entirely new enclosed space for entertaining and dining.
The new roof needed to house two electrically operated sliding sunroofs alongside integrated HVAC and AV systems, all within a lightweight carbon fibre structure suited to the yacht’s upper deck. The scope also included the manufacture and installation of a new 3.8m navigation equipment mast, fitted directly onto the roof structure.
The Approach
To manage the many, often competing inputs on a project of this scale, BMComposites commissioned the Palma-based design house 3D Tech to bring together requirements from the service integration teams, composite engineers Gurit, and H2 Yacht Design, who drew the lines for the new Sky Lounge. Every feature and detail was captured in a single, comprehensive 3D CAD model, which stayed the primary reference through tooling, manufacture and installation.
The roof structure and mast were manufactured off-site in three main sections, then delivered to the yard for assembly and installation, with BMComposites project managers overseeing the process throughout. Building the components in composite from CNC-machined female tooling meant far less fairing than traditional aluminium construction would have required, a real advantage in a weight-sensitive area of the yacht.
Early 3D scanning of the deck also ensured an engineered fit for the large components, allowing the full roof to be installed in just two days with no hot works required on board.
The Result
Working closely with the captain, project management team, designers, engineers and subcontractors, BMComposites managed the process from initial briefing through to final commissioning. The Sky Lounge refit was described as the “jewel” of Coral Ocean’s €35m refit programme, and was recognised with a Judge’s Special Award at the Boat International World Superyacht Awards in 2023.
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