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  2. Iceboat - Wikipedia

    en.wikipedia.org/wiki/Iceboat

    Boer Ice sailing in the Netherlands in 1938. An iceboat (occasionally spelled ice boat or traditionally called an ice yacht) is a recreational or competition sailing craft supported on metal runners for traveling over ice. One of the runners is steerable. Originally, such craft were boats with a support structure, riding on the runners and ...

  3. Ohio-class submarine - Wikipedia

    en.wikipedia.org/wiki/Ohio-class_submarine

    The Ohio class was designed in the 1970s to carry the concurrently designed Trident submarine-launched ballistic missile. The first eight Ohio-class submarines were armed at first with 24 Trident I C4 SLBMs. [6] Beginning with the ninth Trident submarine, Tennessee, the remaining boats were equipped with the larger, three-stage Trident II D5 ...

  4. Ice class - Wikipedia

    en.wikipedia.org/wiki/Ice_class

    Ice class. MS Viking XPRS, a ship in Finnish-Swedish ice class 1A Super in Helsinki harbour during wintertime. Ice class refers to a notation assigned by a classification society or a national authority to denote the additional level of strengthening as well as other arrangements that enable a ship to navigate through sea ice.

  5. SS Ohio (1872) - Wikipedia

    en.wikipedia.org/wiki/SS_Ohio_(1872)

    SS Ohio was an iron passenger-cargo steamship built by William Cramp & Sons in 1872. The second of a series of four Pennsylvania-class vessels, Ohio and her three sister ships—Pennsylvania, Indiana and Illinois—were the largest iron ships ever built in the United States at the time of their construction, and amongst the first to be fitted with compound steam engines.

  6. Ice navigation vessel - Wikipedia

    en.wikipedia.org/wiki/Ice_navigation_vessel

    Ice navigation vessel or Ice-strengthened vessel is a class of ships specially prepared for independent ice navigation in the waters of the polar seas and for following icebreakers in especially difficult ice conditions. [ 1][ 2] Various registration authorities assign ice classes to vessels based on their technical characteristics. [ 3][ 4 ...

  7. Polar Class - Wikipedia

    en.wikipedia.org/wiki/Polar_Class

    Polar Class (PC) refers to the ice class assigned to a ship by a classification society based on the Unified Requirements for Polar Class Ships developed by the International Association of Classification Societies (IACS). Seven Polar Classes are defined in the rules, ranging from PC 1 for year-round operation in all polar waters to PC 7 for ...

  8. List of icebreakers - Wikipedia

    en.wikipedia.org/wiki/List_of_icebreakers

    This is a list of icebreakers and other special icebreaking vessels (except cargo ships and tankers) capable of operating independently in ice-covered waters. Ships known to be in service are presented in bold .

  9. USS Ohio (SSGN-726) - Wikipedia

    en.wikipedia.org/wiki/USS_Ohio_(SSGN-726)

    USS Ohio (SSGN-726) First and Finest! 4 × 21 inch (533 mm) bow torpedo tubes. USS Ohio (SSBN-726/SSGN-726), the lead boat of her class of nuclear-powered fleet ballistic missile submarines (SSBN), is the fourth vessel of the United States Navy to be named for the U.S. state of Ohio. She was commissioned with the hull designation of SSBN-726 ...

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