The “World’s first hybrid superyacht” by Feadship features apart from its astonishing design a truly “eco-friendly" electro-mechanical propulsion: a Wärtsilä 9L20 4-stroke engine pumping 1,800 kW into three Caterpillar generators charging banks of lithium-ion batteries running the electrically-powered screws. These consist of a single central propeller nacelle and an in-line azimuthing thruster set in the slipstream – an arrangement that Feadship says has never before been installed in a yacht.
Savannah is the first superyacht to feature an eco-friendly blend of single diesel engine, three gensets, batteries, propeller, azimuting thruster and a streamlined hull shape. Offering fuel economies of thirty per cent, the pioneering electro-mechanical propulsion platform marries Feadship’s past experience and forward thinking approach within a pure custom creation.
“The owner of Savannah loves to be at one with the water,” explains McCumber. “This phenomenal design allows him to run from the main salon and dive straight into the sea.”SOMEONE_FAMOUS_TITLE
Further innovation comes in the form of a floating superstructure, an underwater lounge, the ‘open’ aft deck areas, and much more besides. Inspired by the 2010 Feadship Future Concept Breathe, Savannah is a demonstration of the cost-effective and cleaner mode of propulsion that can be achieved within an entirely bespoke superyacht. Savannah has a dynamic hull shape with a very fine entry, uses one efficient medium-speed Wärtsilä main engine instead of two higher-rev diesel motors, a single central propeller shaft installation on the centreline and three gensets.
The design of the aft ship allows for a propeller that is forty per cent larger than the norm. Combined with the power supplied by the thruster, the load on the propeller is only half that of a conventional twin screw yacht. This again results in a higher efficiency and fewer vibrations. In addition, the large stern thruster also ensures excellent manoeuvrability in marinas.
Taken as a whole, the package offers major benefits in terms of fuel saving and consists of five modes: manoeuvring, diesel-electrical, range, high speed and boost. This guarantees a high level of reliability and a better engine load than any other superyacht afloat today. “It is not the individual technologies used on Savannah that are new in the yachting world – it is the way they have been combined,”.
Moreover, Savannah is the first yacht in the world to be running with an azipull and a variable pitch propeller.
“Savannah is a yacht full of premiers,” emphasises Feadship director Henk de Vries. “As the first ever hybrid superyacht, she offers incredible flexibility in operations and loading of the power plant. The result is fuel savings of some thirty per cent compared to the best boats that we have launched to date.
“The way in which one gigantic propeller has been installed in front with another electrically powered prop in its slipstream has also never been applied on a yacht. A similar system has been used on board passenger ships in Japan, but that is an ‘industrial’ solution, without the attention to comfort required on a Feadship.
These 3 new design well deserved awards are the proof that a new generation of eco-friendly vessel is possible and it is possible by developing astonishing and performing hull and superstructure designs to allow guests to maintain a functional relationship with the sea. In fact, there is an unbroken cascade of main deck living areas from the dining room, through the open salon, across the pool deck and down to the sea. In other places, huge expanses of glass link the interior with the world beyond, from her partially submerged “Nemo” room at the stern to the bow’s hidden observation room.
The slim, smooth silhouette and plumb bow convey a sense of speed while the metallic silver-green exterior finish extending even to the exterior deck overheads magically reflects the changing colours of sea and sky.
We are very pleased to see finally at sea these forward thinking custom creations that truly sets up new milestones in defining how superyachts can lower their impact while improving all performances through green technology and funcional design.