Page 20: of Maritime Reporter Magazine (August 1992)

Propulsion Update

Aquamaster-Rauma To Deliver

Second Set Of Azimuthing Thrusters

For Finnish Icebreaker Program

Aquamaster-Rauma, of Rauma,

Finland, one of the world's leading manufacturers of propulsion units, has received a second order from the

Finnish Board of Navigation for the company's largest set of Aquamaster azimuthing thrusters, to be deliv- ered in June 1993 to Finnyards' ship- yard. The new azimuthing thrust- ers will be fitted onboard the second multipurpose government ice- breaker being built by Finnyards and scheduled for delivery in early 1994. The first Finnish icebreaker in the class, ordered last October, also received a set of Aquamaster azimuthing thrusters.

The thrusters are based on a new construction, type ARC 1, which has been developed specifically for ice- breakers. The thrusters, like the vessel itself, will meet the Det norske

Veritas "Icebreaker Polar 10" ice class standards, and have been di- mensioned to operate in ice more than 5.9 feet thick.

Both of the icebreaker's thrusters are rated at 7.5 MW and will be able to absorb over 2 x 15,000 hp in open water. The thrusters are equipped with fixed pitch 4.2-meter (13.8-foot) diameter propellers mounted in nozzles.

The thrusters generate a steerable thrust force that acceler- ates the vessel forward, astern and sideways. This allows the thrust force to be used for icebreaking, roll- ing the ship or cleaning and widen- ing the channel.

The vessels will operate in winter as icebreakers and in the open wa- ter season on various tasks, such as laying cables, anchor handling and towing.

The Aquamaster azimuthing thrusters will give each icebreaker a 196-long ton bollard pull.

Having invested heavily in im- proving the reliability, performance and versatility of steerable propul- sion units, the development and manufacture of the two giant azimuthing thrusters has given

Aquamaster-Rauma the opportunity to show that units of this kind can safely be used in high power ranges and tough ice conditions.

Aquamaster-Rauma also manu- factures Rauma deck machinery and

Unex ship's boilers and waste water treatment plants.

The 7.5-MW, Aquamaster US ARC 1 azimuthing thruster.

For free literature describing units or other extensive product line,

Aquamaster-Rauma's propulsion Circle 43 on Reader Service Card

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Maritime Reporter/Engineering News