page_title: Suur Tõll (icebreaker)
section_title: Technical details
hierarchical_section_title: Suur Tõll (icebreaker) / Technical details
caption_attribution_description: English: Icebreaker "Suur Tõll", Tallinn - engine room
context_page_description: Suur Tõll is an Estonian steam-powered icebreaker preserved in the Estonian Maritime Museum in Tallinn. She was originally built for the Russian Empire in 1914 by AG Vulcan in Stettin, Germany, as Tsar Mikhail Feodorovich. In 1917, she was taken over by the Bolsheviks and renamed Volynets. However, in 1918 she was captured by Finland and served as Wäinämöinen until 1922, when she was handed over to Estonia according to the Treaty of Tartu and renamed Suur Tõll. When Estonia was occupied by the Soviet Union in 1940, the icebreaker rejoined the Soviet fleet and was again named Volynets. She remained in service until 1985.
  The Soviet Navy decided to sell the decommissioned icebreaker for scrap, and she was purchased by the Estonian Maritime Museum in 1987. The ship was given back her original Estonian name and was extensively renovated; Suur Tõll, the largest preserved pre-war icebreaker in the world, is currently moored at Lennusadam, the historical seaplane harbour in Tallinn.
context_section_description: Suur Tõll is 75.4 metres (247 ft) long and has a beam of 19.2 metres (63 ft), and at a draft of 5.7 metres (19 ft) her displacement is 3,619 tons. Her hull, strengthened by a cast iron stem and a large number of longitudinal and transverse bulkheads, is surrounded by an ice belt with a width of 2 metres (6.6 ft) and thickness of one inch (25 mm). To assist icebreaking in difficult conditions she is also equipped with heeling tanks and pumps capable of transferring 570 tons of water from one side to another in ten minutes, listing the ship by 10 degrees. Furthermore, her trim could be adjusted by a forepeak tank with a capacity of 600 tons of water. All tanks were connected to an electrical control and indication system.
  Powered by three 2,300 ihp triple-expansion steam engines, two driving four-bladed propellers in the stern and one powering a third propeller in the bow, Suur Tõll was one of the most powerful icebreakers in the Gulf of Finland. All moving parts had been dimensioned 35% stronger than in other ships of similar power. She had six coal-fired boilers equipped with mechanical ventilation, burning 3.5 tons of coal per hour in normal operation and four tons during ramming. Her fuel stores could hold 700 tons of coal, almost as much as the cargo capacity of a small cargo ship of the time.
  When Suur Tõll was delivered in 1914, she was one of the most modern icebreakers in the world. Extensively electrified, she had electrical lighting and her anchor windlass, winches and two coal cranes were all powered by electricity to avoid having easily freezing steam pipes on the deck. Furthermore, she had an electrical salvage pump that could be transported to a grounded ship in a boat or on a sledge over ice without bringing the icebreaker too close to the shallow waters. When delivered, her radio station had a range of 400 kilometres (220 nautical miles), but it was later increased to 1,100 kilometres (590 nautical miles).
caption: Engine room
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