Feadship has launched the 83.50-metre (273’11”) Savannah, 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. 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.
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.
The perfect combination 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,” comments the owner’s project manager, Ted McCumber. “Feadship has leveraged on all the options available in the marine industry today to bring this hugely innovative system to completion.
“The possibility to choose between diesel, diesel-electric or fully electric is truly exceptional. Moreover, Savannah is the first yacht in the world to be running with an azipull and a variable pitch propeller. Only Feadship engineering and the rich experience of this yard could have successfully concluded a project of such scope and vision,” McCumber continues.