Atle-class icebreaker

The Atle class comprises five icebreakers built for the Swedish and Finnish Transport Agency. The two Finnish ships, Urho and Sisu, are sometimes considered a separate class, but all are operationally identical.^[1]

Icebreaker Atle
Class overview
Builders	Wärtsilä Helsinki Shipyard, Finland
Operators	Swedish Maritime Administration Arctia Icebreaking
In commission	1974–
Completed	5
Active	5
General characteristics
Type	Icebreaker
Displacement	9,500 t (9,350 long tons)
Length	104.6 m (343 ft 2 in) o/a
Beam	23.8 m (78 ft 1 in)
Draft	7.3–8.3 m (24–27 ft)
Installed power	16.2 MW (21,700 hp)
Propulsion	Diesel-electric
Speed	19 knots (35 km/h; 22 mph) (maximum) 14 knots (26 km/h; 16 mph) (service)
Bollard pull	190 tonnes
Bunker capacity	2,200 m³
Endurance	6–8 weeks

The ships were built by Wärtsilä Helsinki Shipyard in Finland, and have entered service in the mid to late 1970s.^[1] The maneuvering system, incorporating dual rudders and dual bow propellers, represented significant technical innovation. They are also notable for their high level of crew comfort (for their time), to a point where Urho has served the Finnish government as a VIP transport.

Ships

• Atle, Sweden, commissioned 1974^[1]
• Urho, Finland, commissioned 1975^[1]
• Frej, Sweden, commissioned 1975^[1]
• Sisu, Finland, commissioned 1976^[1]
• Ymer, Sweden, commissioned 1977^[1]