The cursor system for deployment through the moon pool


environment and an environment toxicology laboratory to study the harmful effects of various chemical, biological and physical agents on living organisms. There are also laboratories to examine water samples, collections from plankton net and fish collected from the trawl. Most of the laboratories are located on the 3rd deck, which is the same as the working deck, to make the workflow as easy as possible. To store and conserve samples during the cruise there are four cooler rooms and two freezer rooms. In addition, there is space for three container laboratories outside on the work deck. The vessel also hosts an auditorium for 50 persons and a separate education lab. On the 9th deck, above the bridge, there is an observation room for sea mammal and bird observations.


Contradictory requirements


Designing a research ice-breaker is not an easy task. On the one hand, you have the demand for a silent vessel with minimum Underwater Radiated Noise (URN) and bubble- free zones for all transducers, and on the other, there is the need


The main source of underwater radiated noise is normally the propellers. Due to the requirements for manoeuvrability in ice-covered areas an azimuthing type of propulsion system was selected, even though this is not the type of system with the lowest noise


68 | The Report • September 2020 • Issue 93


for extreme force when breaking ice. Head of design at Rolls-Royce Marine, Mr Einar Vegsund, was responsible for the design of Kronprins Haakon, and says the following about his work on this design:


“Noise signature and air bubble sweep down is a challenging task for all oceanographic research vessels and even more challenging for ice-going vessels since the hull and propulsion systems must be designed to meet the extreme environmental conditions in polar areas.


As ship designers, we have to balance several contradictory requirements and find the optimum balance between efficiency, noise, ice-breaking capability, redundancy, reliability, manoeuvrability, seakeeping, etc.


signature, and a huge effort was made to optimise the system and make it acceptable (propeller, electric motors, steering gear etc.).


The new RV Kronprins Haakon is ice classed according to PC-3 ICE-BREAKER notation and the propellers must have the strength to ‘eat’ ice of 1.5m thickness. The vessel is equipped with two ducted, 5-bladed fixed pitch propellers with a diameter of 4,500mm and has been designed to be free of sheet cavitation at speed up to 11 knots.


Design propellers have been tested and verified in the large HYKAT cavitation tank at HSVA, Germany. Other machinery and auxiliary systems have been designed according to low noise principles being resiliently mounted on well- stiffened foundations.


A high number of acoustic sensors are hull mounted in the forward part of the vessel and exposed to disturbances from air and particles generated by the bow as it pierces the water and waves. In order to avoid damage to the sensors from ice they are flush mounted and protected by titanium windows.


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