Guide to Hull Maintenance & A Detailed Look Below the Surface

Lagoon 46 Catamaran Underwater Profile

In this instructional piece, we delve beneath the waves to explore the underwater profile of the Lagoon 46 Catamaran. While our blogs and videos often showcase the glitz and glamour of these magnificent vessels, today we uncover the unseen aspects that are crucial for maintenance and servicing. Join us as we dissect the key features and maintenance points of the Lagoon 46, offering insights into what to look for during routine upkeep.

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What to Look for During Servicing

During routine servicing of your catamaran, particular your Lagoon catamaran, while the vessel is out of the water, it’s essential to pay attention to several key areas:

Clamshell Fittings and Skin Fittings:

Clamshell fittings are strategically placed throughout the boat to deflect water from drains, lockers, and scuppers.

Skin fittings, including water intakes and drain discharges, should be inspected for any blockages or marine growth during each service period.

Ground Earth Plates:

Ground earth plates serve to ground the boat and are integral to the electrical system. Check these for secure connections and corrosion.

Mini Keel Protection:

The mini keel design provides a shallow draft for cruising but also offers protection during groundings. Ensure the protective shoes are intact to safeguard against damage.

Deck Drains:

Large deck drains prevent water ingress, meeting safety requirements. Regularly clean these drains to maintain optimal functionality.

Hydraulic Platform:

If equipped, inspect hydraulic lines, rams, and components of the platform for any signs of wear or damage.

Rudders and Sail Drive:

Check the rudders for excessive play and inspect the sail drive system for proper operation. Any anomalies should be addressed promptly to prevent further issues.


Check anodes for signs of corrosion or wear. These sacrificial components protect metal parts of the boat from electrolysis and should be replaced if significantly depleted.

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Key Features of the Lagoon 46 Hull

The hull of the Lagoon 46 boasts several distinctive features that contribute to its performance, safety and functionality:

Emergency Escape Window:

A fixed window serves as an emergency escape and provides a clear view of the water, enhancing safety and visibility while underway.

Gullwing Design:

The gullwing design deflects waves, reducing slapping and enhancing buoyancy, particularly in challenging sea conditions.

The gullwing shape deflects waves, minimizing slapping and ensuring a smoother ride in various sea conditions.

By dispersing water and providing additional buoyancy, the gullwing design helps prevent burying the bow, particularly in following seas.

Increased Interior Volume:

Compared to its predecessor, the Lagoon 46 offers approximately 30% more interior volume, with enhancements to cabin space and overall comfort.

Each hull gains approximately 2 cubic meters of interior space, offering more spacious cabins and living areas for enhanced comfort.

The forward cabins benefit from the increased volume, providing generous sleeping quarters with ample room for relaxation.

Streamlined Underwater Profile:

Despite the increased volume above the waterline, the underwater profile remains streamlined, ensuring optimal sailing performance without sacrificing stability.

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Lagoon Catamarans combine innovative design elements with practical features to deliver a superior cruising experience. By understanding the nuances of its underwater profile and prioritizing routine maintenance, owners can enjoy years of safe and exhilarating adventures on the open seas.

Thanks to years of research, collaboration, and innovation, this system promises to simplify and enhance the sailing experience, making it more accessible to all, especially those new to sailing. As Bruno Belmont and the team at Lagoon continue to push the boundaries of what’s possible, the future of catamaran sailing looks brighter than ever.


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