A reinforced design has led to a novel application of free-hanging, full-spade rudders on Australia’s new Antarctic supply research vessel Nuyina.
The 150m vessel will be the first of its icebreaking class to such rudders when it is delivered from Damen Galati shipyard in April 2020. These and several other systems have been supplied by Damen Marine Components (DMC).
DMC cooperated with class society Lloyd’s Register to deliver the densest rudders it has ever built, with rudder stocks of over 1,000 mm in diameter. Other unusual features include integrated mechanical rudder stoppers between the rudder blade and hull, rather than on the outside of the vessel due to unique hull form.
Damen is responsible for detail engineering and manufacturing of the rudders and steering gear and enlisted MacGregor Hatlapa to deliver hydraulics, controls and power systems for the rudders. MacGregor manufactured the steering gear assemblies and the hydraulic systems that power them based on its Poseidon ram-type steering gear, while DMC delivered the rudder system, neck and carrier bearing systems steering gear foundations, electrical system and primary steering control system.
The vessel’s icebreaker classification and high polar-class notation mean that, although its actual maximum design speed is around 16 knots, most components have been designed to cope with theoretical speeds of more than 31 knots. Similarly, the hull has been designed to resist forces that would normally act on a hull twice its length.