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.
Redundancy is ensured by fitting a large contra-rotating and azimuthing sternthruster just aft of the main propeller. 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 sternthruster 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.
“The possibility to choose between diesel, diesel-electric or fully electric is truly exceptional”