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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