Sirena's first steel superyacht, a 42m, sold on spec before launch
A production yard steps up to steel
The 42M is a clean break from the composite motoryachts that made Sirena's name. She measures 42.2 metres with an 8.8-metre beam and a 2.5-metre draft, comes in at 433 gross tonnes, and pairs a steel hull with an aluminium superstructure. Construction began on spec in 2024, and the yard christened this first hull with her owners this week, about two months before her international premiere.
The naval architecture is by Van Oossanen, using its Fast Displacement Hull Form with a Hull Vane foil aft, the same efficiency package that has gone under a run of larger custom yachts. Luca Vallebona drew the exterior, Hot Lab handled the interior, and the layout runs to ten guests in five staterooms.
Why the owner cares
For anyone tracking Sirena as a brand, the point is that it now competes where the full-custom yards do, not just against other production lines. A steel 42-metre carries a different survey, a different flag conversation and a different resale pool than a 30-metre composite, and it puts Sirena's badge on a boat an established owner can step up into rather than out of.
That the hull sold before launch, arranged in-house, is the harder signal. Spec-built steel in the low-40-metre range only gets ordered when a yard is confident a buyer is waiting, and one was. The commercial line from Sirena is that the sale came out of an existing client relationship, which points to a repeat owner trading up inside the range.
The efficiency angle
The Hull Vane is a fixed foil across the stern that recovers energy from the yacht's own wake, and Van Oossanen has spent years claiming double-digit fuel savings from it on displacement hulls. On a 433-tonne yacht that translates into range and running cost, the two numbers a private owner actually feels on a long passage.
Sirena has not published a range figure yet, and the propulsion package is still under wraps ahead of the debut. What is on the record is the intent: a first steel flagship aimed squarely at owners who want a bigger, quieter, longer-legged boat without leaving a builder they already know.