‘Le Boreal’ - the quintessence of luxury cruising
The French cruiseship company Compagnie du Ponant took delivery of the first in a two-ship series of mega-yacht style cruise ships ordered from Fincantieri.
The lead-ship, Le Boreal, was delivered in April 2010 from the Ancona shipyard which is also building the sistership, L’Austral, scheduled for delivery in May 2011. Measuring 142.10m length overall, 18m wide and a draught of 4.7m, the 10,700gt newbuilding has a flexible passenger capacity from 224 up to 264 accommodated in up to 132 outside suites/staterooms on six decks.
The diesel electric power plant comprises four Wärtsilä medium speed 8L20 gensets each with power output of 1,480kW @ 900rpm. These deliver power to the two 2,300kW Indar induction motors each of which drives a Wärtsilä 3.1m diameter FP propeller to give a service speed of 16 knots at 4,200kW. The vessel is also fitted with an 800kW Rolls-Royce bow thruster, has a DP capability, is built to ice class 1C and BV Comfort classification.
The structure of the stern and the propeller parameters have been analysed with particular care for the position of the main restaurant directly above the propellers. The final vibration predicted levels were calculated using a global finite element model and the vibration measurements performed onboard during sea trials show a good correlation with calculations.
The propeller designed for the newbuilding followed a new procedure which does not consider the hull wake as a fixed input data, but as an integral part of the propeller design loop. The wake optimisation was carried out in parallel with the blade design and this was a decisive factor leading to the complete suppression of the cavitation on the blade surface and the cavitating tip vortex. The fixed five-bladed configuration proved to be the best compromise between efficiency and propeller load.
All the work done in the preliminary design phase, both from hydrodynamic and structural point of view, has been confirmed by sea trials results, thus obtaining the challenging highest grade of Bureau Veritas Comfort Class.
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