The new 24m “Zattera” currently under construction at Castagnola Yacht in Lavagna is based on a project by Nauta Design and Francesco Rogantin from an idea by Renzo Piano and Olav Selvaag and with the propulsion system developed by Siemens Energy,

Inspired by the dream of living the sea by privileging the spiritual dimension of silence and harmony with nature, it is therefore conceived more as a “marine boat” than as a “yacht”.

It is a construction in wood, an ancient material that lives on and remains the most ecologically sustainable, but with a modern character, with an essential and original design that highlights the cleanliness and simplicity of the hull lines.

The relatively light boat has a displacement hull that reaches a maximum speed of 12 knots (cruising speed of 10.5 knots).

The choice of the Siemens Energy hybrid propulsion system was fundamental in order to minimize atmospheric emissions: great design and construction care was also taken to eliminate vibrations and the acoustic impact on the surrounding environment, in particular while navigating in pure electric mode guaranteed by lithium-ion batteries.

The propulsion system is powered by two 180 kW variable speed diesel generators and a 95 kWh battery pack, connected to a 700 Volts direct current distribution system, which powers both the propulsion and the other on-board utilities.

The two Diesel generators were expressly developed by Mase Generators for Siemens Energy with Volvo Penta D4-300 engines using variable speed technology with permanent magnet alternators in order to minimize consumption and emissions.

The generators are installed on a double series of anti-vibration mounts, an uncommon solution on this size of boat, which underlines the desire to reduce the acoustic impact. For the same purpose, a lot of work was done on the materials that make up the soundproofing box of the generators themselves and an in-depth study was carried out on the soundproofing of the engine room.

Several photovoltaic panels will allow an additional energy source at zero cost and impact.

The on-board electrical balance has been studied in order to therefore allow an important autonomy both in propulsion and in other utilities.

From an idea by Renzo Piano and Olav Selvaag

Deck and Interior Design: Nauta Design

Naval Architecture: NAMES by Francesco Rogantin

Hull carpentry: Castagnola Yacht

Hybrid propulsion: Siemens Energy in collaboration with MASE GENERATORS and VOLVO PENTA

With the collaboration of Adi Nataf, architect, and Jürgen Reinhold, MüLLER BBM