The 44m aluminum four-deck expedition motor yacht Poseidon was designed by ENRICO GOBBI – TEAM FOR DESIGN from Venice. The intent was to create a robust and comfortable world explorer. The designer described the style as “military and luxury”. Speaking of world cruising, the yacht has a range of 10,000 nautical miles.
Comments by Federico Rosse, COO of Rossinavi:
“Poseidon is designed as a ‘go-anywhere exploration yacht’ and the construction in Ice Class 1B permits this yacht to navigate in areas where it’s likely to encounter floating ice. The main impact of this ice class is the reinforced ‘ice belt’ around the hull able to resist impact loads even greater than 55 tonnes per square meter. The entire yacht project contains all aspects of this specific regulation under the technical point of view, emphasizing the right relevance to specific needs in navigation systems, comforts and living spaces.”
Poseidon‘s main deck cockpit has a large dining table for all the yacht’s guests and a sitting area with sun pads adjacent the pool. Another sun area is located on the sun deck, with sun beds, lounge sofas and a fully equipped exterior bar. The external decks of Poseidon have plenty of space for enjoying the outside thanks to the various configurations of sitting, lounge, dining and sun areas, and the Master has his own private exterior lounge area on the upper deck.
The glass pool located aft has a diamond-cut bottom edge just above the yacht name showing through the water; a detail that guarantees a “wow” effect when the stern platform is open in the “beach” configuration.
The naval architecture and marine engineering of this explorer yacht were developed by Arrabito Naval Architects, who have studied particularly efficient hull lines able to run in low consumption long range but also to reach higher top speeds than a usual full displacement explorer vessel.
With the standard engines option (C32 Acert Caterpillar 2x 1300 bhp) this vessel will reach a top speed of about 17 knots, while with the optional propulsive solution of MTU 16v2000M94 (2 x 1936 kW) the top speed will be about 20 knots (cruise speed of 17 knots).
The hull, the decks and superstructure will be totally built in Marine Grade Aluminium, the idea is that both hull and superstructure could be light gray color recalling a Marine vessel.
The structural calculation will be aided with finite element methods (F.E.M.) to guarantee the lightest and stiffest explorer vessel in its own category.
|Length over all:||43.85 m|
|Exterior Design:||Team 4 Design - Enrico Gobbi|
|Naval Architecture:||Arrabito Naval Architects|
|Interior Design:||Team 4 Design - Enrico Gobbi|
|Max. speed||17 knots|
|Cruising speed||14 knots|
|Engines:||2 x Caterpillar C32 Acert (1300 bhp each)|
About ICE Class Yachts
Some technical facts relevant to the assignment of an “ICE CLASS IB” to a pleasure vessel.
The notation ICE CLASS IB stands for vessels capable to sail in a channel kept open by an Ice-breaker, with ice having 0.6 m thickness max.
The notation involves interventions at the level of:
- Hull scantlings and strength;
- Machinery, rudders, propellers and shafting;
- De-icing and anti-freezing.
HULL SCANTLING AND STRENGTH
Provided that the Design Water Lines with fully laden and lightship conditions are calculated, an “ICE-BELT” is established having a height starting 0,4 m above the fully laden condition WL extending down for 0.6 m below the lightship WL.
For instance, if the draft difference between the two said load conditions is 0.3 m, then the total height of the ICE-BELT will be 0.6+0.3+0.4 = 1.3 m.
The length of the vessel is divided into three regions, fore, mid-ship and aft and the scantlings will decrease moving from the bow, fore region, to the aft one.
The increased scantlings will interest the ICE-BELT as above, and will involve:
The plates thickness which, besides an increased value due to the ice pressure, will have an “abrasion addition” (minimum 2 mm) to withstand the ice “fretting corrosion”;
The stiffeners sectional modulus and spacing (maximum 0.45 m for ICE CLASS IB).
Finally, attention will be drawn on the metallic materials choice, which will have to be capable to withstand low temperatures.
MACHINERY – RUDDERS – PROPELLERS – SHAFTING
The minimum allowed power on an ICE CLASS IB vessel will be 1000 kW (1360 SHP). The rudders thicknesses and scantlings will have to follow the ones applied to the hull. The rudder stocks and the propeller shafts will be calculated with scantlings higher (basically 1.3 times) than the standard ones.
The propellers will have increased scantlings and material/stiffness-wise will have to be calculated to withstand the hit with a 1.5 m thick ice block.
The intact and damaged Stability Information Booklet (SIB) will have to prove that the vessel maintains a stability as per Rules also with ice on all the exposed external decks with a rate of 140 kg/m2 (ice thickness 14 cm).
All the sea water chests (Main Engines and Generators refrigeration, fire pumps, watermaker, etc.) must be provided with anti-freezing systems.
To avoid the ice addiction on decks over the limit as above, de-icing heating systems 200-300 W/m2 must be provided.
Further provisions must be taken in order to avoid that vital system such as the anchoring one is put out of duty because of the ice presence.