Offshore Planning: Evolution Sails & Stella Watermakers for Bluewater Cruising

Square Top Main & Genoa Upgrade for Offshore Performance
Docril Canvas Covers & Custom Turret Top Protection
New Stella Watermaker Installed After Dessalator Removal
Lagoon 400 Water Tank Locker Modification for Better Access

and other smaller ticket items...



Lagoon L400 Upgrade - Part 2 of 3.
Tap here to see PART 1.

Tap here to see PART 3.
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Evolution Sails onboard offshore catamaran

Main, Genoa & Screecher Upgrade by Evolution Sails

The team at Evolution Sails (now GC Sails) Gold Coast were engaged to redesign our sail wardrobe with a clear set of offshore performance goals.

The brief included:
1. A square-top mainsail design
2. Equal or greater sail area without increasing boom or mast length
3. Improved sail shape and overall performance
4. Enhanced upwind performance
5. Full reefing control for all three reefs from the helm

The results delivered a significant upgrade across the sail plan:
* The mainsail area increased by 13%, now measuring 63.83 m²
* The genoa increased by 3%, now measuring 39.85 m²
* The screecher / Code 0 remained largely unchanged in area

The new mainsail now features five battens (an increase of two over the previous configuration) along with two reworked factory batten cars.

These changes, combined with the redesigned sail geometry, have greatly improved handling efficiency, enabling single-handed reefing and sail adjustments to be carried out entirely from the helm.

The spinnaker even managed a new sock and neck, allowing easier 'snuffing' of the spinnaker from the helm via winch. Their service is exceptional.

VERY HAPPY FOLLOW-UP: We have found that the increased main sail area, is forcing us to 'reef' earlier (1st reef in around 15-20kts), as it forces more rudder deflection to keep the rudder centred.  If we don't, the rudders cause unnecessary drag.

Love the full wardrobe of sails.

Docril canvas covers for Lagoon L400

Custom Docril Covers by Trimright for Offshore Protection

We have moved away from Sunbrella, as we feel the fabric quality has declined over the past 10–15 years, and have now switched to Docril.

After speaking with Cayne from Trimright, he strongly recommended Docril as a superior alternative.

Docril is a 100% solution-dyed acrylic fabric treated with a Teflon coating. This creates a protective barrier that enhances water repellency and slows dirt accumulation, making it well suited to harsh marine environments.

More information on Docril is available through official product resources.

For this refit, we chose to weatherproof the sides using clear panels combined with mosquito netting, while the aft section is fully screened. Given the naturally limited exposure to wind and water in that area, this approach significantly improves usability without compromising protection.

The result is a far more versatile cockpit space, usable in all conditions, effectively doubling the comfort and liveability underway and at anchor.

The helm area also received an upgrade with new clears. The large zippered windows provide excellent airflow through summer while maintaining a warm, dry, and protected space in winter.

With all sheets and halyards now led back to the helm, passages are safer and more controlled, with minimal need to leave the cockpit.

HAPPY FOLLOW-UP: The setup has held up exceptionally well, with no issues so far despite encountering challenging conditions over the past six months, including winds and rain up to 45 knots. The finish has attracted plenty of positive comments from other boat owners. In this case, you really do get what you pay for.

Stella Water Maker Control Panel

New STELLA Watermaker Installation for Reliable Offshore Water Supply

The original factory-installed desalination system was a Dessalator unit. While it performed reliably as a 12V DC system, output was limited to around 35–40 litres per hour, and Total Dissolved Solids (TDS) regularly exceeded World Health Organisation guidelines at 600+ ppm, even after replacing membranes, filters, and sensors.

Our goal was to significantly increase freshwater production to approximately 70 litres per hour while utilising available battery capacity more effectively. At the same time, we needed to reduce TDS levels to below 300 ppm for improved drinking water quality.

We selected a STELLA Watermakers system, which uses a 12V DC low-pressure pump to feed filtered water into a high-pressure 240V AC pump operating at approximately 4–6 amps. This pump then pressurises the water to over 800 psi before it passes through a single 4-foot membrane.

A key advantage of the system is its simplicity, very few moving parts and no complex electronics aside from the auto-flush function. This allows for fine-tuning of water quality with precision and reliability. Our YouTube video shows initial testing delivering results of just 111 ppm TDS.

Very positive follow-up: Since the initial installation, performance has remained consistently strong, with sub-100 ppm readings recorded after the first testing phase. We’ve been extremely impressed with the system and extend a big thank you to STELLA.

Two years on, the same membrane is still in use, producing around 130 ppm. Support has also been outstanding, with fast turnaround on parts—even when operating from remote locations such as the Loyalty Islands.

Solving the Lagoon 400 Water Tank Access Problem

Professional Repair Completed “Overseas”

Prior to our purchase of the yacht in Australia in 2020, we were advised that the known Lagoon 400 water ingress issue beneath the port water tank had been professionally repaired overseas by qualified marine trades.

At the time of inspection, the visible work appeared to be exceptionally well executed. The area had been properly repaired, faired, and repainted to a high standard, with no obvious signs of prior damage. Both we and the surveyor were impressed with the quality of the finish, and it was recorded as a resolved issue during the pre-purchase assessment.

Naturally, this provided reassurance that one of the known problem areas had been addressed and could be considered “ticked off” the list.

Or so we believed at the time…

Minor Bulkhead Separation from Lower Hull Structure

It wasn’t until we later serviced the freshwater pump inside the port area that we began to notice the less visible side of the previous repair. At the time, we accepted that the work had been carried out professionally, and given the yacht had successfully crossed the Tasman Sea, no small test of any vessel, we initially chose to leave it as it was.

However, around 12 months later, after tapping on various sections and detecting a distinct hollow sound in certain areas, we decided to investigate further.

Closer inspection revealed that some sections had not been properly prepared prior to glassing. As a result, parts of the repair had begun to separate from the lower hull structure. These areas were identifiable by the hollow sound when tapped and were located in positions that would have been extremely difficult for a surveyor to access or assess visually.

Further investigation uncovered two areas where the timber core had been damaged or had started to deteriorate. This marked the beginning of a more extensive remediation process, which involved cutting back all compromised sections and grinding them back to clean, solid fibreglass before rebuilding the structure with new laminates.

In the more difficult-to-access sections, it became clear that sanding, sealing, and bonding had not been completed to a sufficient standard, which contributed to the progressive delamination of the previously laid glass.

During this process, we also took the opportunity to relocate the watermaker from the port aft cabin to the port forward cabin, carefully routing plumbing and electrical systems through the newly repaired area for improved layout and access.

Finally, the entire area was top-coated, providing a clean finish and making any future structural changes or anomalies far easier to identify early.

Lagoon L400 Galley refit all Electric

Glassing the Coves with Bonding Cement for Structural Strength

Lagoon (along with several other mainstream production catamaran builders) commonly uses non–resin-based adhesive bonding systems for a range of non-structural interior components.

This flexible, rubber-like adhesive performs well over time, allowing for movement and vibration absorption and providing durability in normal cruising conditions.

During our inspection and subsequent use, we identified a number of areas where these adhesive coves had begun to separate. As a result, we chose to progressively replace selected sections with a more permanent resin-and-fibreglass solution.

This approach is similar to work undertaken by other long-term cruising crews, including the family on Sailing Nohoā in their “Biggest Boat Job Yet” episode.

Rather than treating it as a single large refit, we are addressing it as an ongoing preventative maintenance task—upgrading sections as we locate joints showing movement, noise, or early signs of wear.

HAPPY FOLLOW-UP: After 1,200 nautical miles of sailing, all previously treated areas have remained quiet, with no further squeaking or signs of deterioration.

Highfield Dinghy and Tohatsu Outboard Hoisted

Highfield Dinghy & Davits Reworked for Offshore Reliability

We chose to purchase a new 4-stroke 9.8hp Tohatsu outboard motor, weighing up the trade-off between the additional weight of a 4-stroke engine and the environmental considerations of a 2-stroke alternative.

However, the increased weight had a noticeable impact on smaller dinghy transoms, affecting trim, performance, and overall efficiency underway. After some trial and error, we determined that the transom height needed to be raised by 50mm. This modification was fabricated in aluminium, mounted to the transom, and then painted for protection and durability.

With these adjustments, the dinghy was able to achieve planing performance with two large adults and the 9.8hp 4-stroke installed.

At the same time, the davits and pulley system were reworked, including an improved purchase system that now makes lifting and stowing the dinghy significantly easier and more controlled.

Initial assessment (not ideal): Despite the upgrades, we were not fully satisfied with the performance. The 9.8hp 4-stroke, as recommended by the retailer, struggled to consistently achieve planing with two people onboard, and the transom modification was required to prevent water ingress. Ultimately, neither outcome met expectations.

As a result, we upgraded to a second-hand 18hp outboard, which immediately transformed performance—the dinghy now gets on the plane easily and runs significantly faster and more efficiently.

Victron Colour Control Panel for all Marine Electrical

Victron Battery & Electrical System Touch-Up for Extended Cruising

We relocated the Victron Energy battery bank to improve accessibility and create a more practical working layout. At the same time, we added individual circuit isolation to each battery, allowing any single unit to be safely disconnected while keeping the remainder of the system fully operational.

Given our heavy reliance on onboard electrical systems, this upgrade was driven by a “what if…” approach—anticipating potential failures and ensuring we are prepared to isolate and manage issues quickly if they arise at sea.

HAPPY FOLLOW-UP: After 1,200 nautical miles, the system has performed flawlessly, and we’re still waiting for an opportunity to properly test the isolation setup in real-world conditions.

“Come on Murphy…”

Catamaran Upgrades Over 2 Weeks in 7 Minutes on YouTube

Youtube Offshore Catamaran haulout
Gratitude

A huge THANK YOU to our SUBSCRIBERS of our YouTube Channel and for allowing us to get to a wider audience.

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