Heesen’s 57-metre Project Setteesettanta puts the owner on a deck of their own

When experienced owners return to the same shipyard, the brief often becomes more exacting. Heesen’s Project Setteesettanta, a 57-metre full-custom aluminium yacht built for returning clients, reflects that progression: greater privacy, cleaner circulation and the freedom to reach shallower anchorages.

The yacht, known by its build number YN 20857, has launched at Heesen’s Oss shipyard in the Netherlands. Exterior design is by Omega Architects, with interiors by Cristiano Gatto Design. Across four decks, the defining decision is to dedicate an entire level to the owners.

That layout changes the social hierarchy on board. Rather than placing an owner’s suite within a shared accommodation deck, it creates a private domain removed from guest circulation. For long periods aboard, particularly with family or charter-style entertaining, that separation can be more valuable than simply increasing cabin dimensions.

Aluminium construction supports the yacht’s relatively light, performance-oriented character. Heesen lists a maximum speed of 18 knots — enough to shorten passages between destinations while preserving the refinement expected of a 57-metre vessel. A draught of about 2.3 metres expands potential cruising grounds and anchoring choices compared with deeper yachts of similar volume.

The shallow draught is not merely a technical statistic. It can materially affect how owners experience a coastline, allowing closer approaches to beaches, islands and bays that would otherwise require a long tender transfer. For a yacht designed around private use, that flexibility makes the platform feel more connected to the water.

Omega Architects’ exterior work gives the vessel a long, low visual line, while Gatto’s interiors remain largely a private matter until fuller photography is released. The most successful custom yachts use design to make complex crew, service and guest movements appear effortless. Project Setteesettanta’s four-deck plan will be judged on precisely that balance.

Its launch begins another intensive phase rather than marking completion. Outfitting, commissioning, trials and final delivery remain, and performance claims should be treated as shipyard targets until verified in operation.

For prospective owners, the project’s relevance lies in its priorities. The industry often celebrates length, but Setteesettanta shows a more mature form of luxury: privacy through planning, cruising access through naval architecture and a highly specific response to how repeat owners actually spend time aboard.

Fact box

– Yacht: Project Setteesettanta, YN 20857
– Builder: Heesen Yachts
– Length: 57 metres
– Construction: Full-custom aluminium
– Exterior: Omega Architects
– Interior: Cristiano Gatto Design
– Decks: Four, including private owner’s deck
– Maximum speed: 18 knots stated
– Draught: Approximately 2.3 metres stated

The first Sirena 42M has entered the water, combining Luca Vallebona’s exterior design, Van Oossanen naval architecture and interiors by Hot Lab.

For a yacht builder, launching a new flagship is more than adding metres. It requires different engineering, supplier coordination, owner expectations and operational thinking. Sirena Yachts has now crossed that threshold with the first 42-metre model in its larger superyacht range.

The Sirena 42M is the Turkish yard’s largest yacht to date and the first completed model from a family also conceived at 35 and 50 metres. Construction began in late 2023, with hull and superstructure joined in February 2025. The first yacht was sold through Sirena’s in-house team and is scheduled to appear at the Monaco Yacht Show.

Exterior design is by Luca Vallebona, with naval architecture by Van Oossanen Naval Architects and detailed engineering by Eureka. The combination places efficient hull development beneath an exterior intended to deliver generous usable deck areas rather than relying on size alone.

Inside, Hot Lab, part of The Viken Group, has developed an organic design language. That description typically signals rounded forms, natural materials and fewer hard visual transitions between rooms. The effectiveness will be easier to judge when completed photography and onboard access replace renders, but the approach suits the current movement towards calmer, residential yacht interiors.

At 42 metres, owner experience becomes inseparable from crew operation. Buyers should examine crew circulation, galley logistics, storage, engine-room access, tender handling and noise isolation alongside the guest spaces. A successful yacht must make hospitality appear effortless because the technical and service plan is working invisibly beneath it.

The Monaco debut will be important for Sirena. It places the 42M in front of brokers, owners and advisers comparing it with established European yards in the same bracket. Build quality, systems access and finish consistency will matter as much as the silhouette.

The first launch also creates a reference point for the wider range. If the 42M performs well in use, it can give credibility to both smaller and larger Sirena superyacht proposals. A flagship’s job is therefore not simply to impress its owner; it must demonstrate what the yard can reliably deliver next.

Fact box

– Model: Sirena 42M
– Length: 42 metres
– Status: First hull launched; Monaco Yacht Show debut planned
– Exterior: Luca Vallebona
– Naval architecture: Van Oossanen Naval Architects
– Engineering: Eureka
– Interiors: Hot Lab, The Viken Group
– Significance: Largest Sirena yacht to date