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Traditional akuilisaq (left) and tuilik (right), ~1893 sketch. A kayaker with water washing harmlessly over his stern and the rear of his spraydeck. A spraydeck (sprayskirt in N. America, akuilisaq or tuiitsoq in Greenland) is a flexible waterproof cover for a boat (in particular for a kayak or a canoe) with holes for the passengers' waists.
The Far West was known as a fast boat because she had powerful engines, a hull with limited water resistance, and a low profile that reduced wind resistance. She set a number of speed records for both upstream and downstream travel on the Missouri and the Yellowstone.
An early ship designed to operate in icy conditions [6] was a 51-metre (167 ft) wooden paddle steamer, City Ice Boat No. 1, that was built for the city of Philadelphia by Vandusen & Birelyn in 1837. The ship was powered by two 250- horsepower (190 kW) steam engines and her wooden paddles were reinforced with iron coverings.
The fundamental cause of "helm", be it weather or lee, is the differential between the center of effort of the sail plan to the center of lateral resistance of the hull. If the center of pressure is astern of the center of lateral resistance, a weather helm, the tendency of the vessel to want to turn into the wind, or to weather-vane, will result.
This power is commonly converted into propulsion by propellers or by water jets, with paddle wheels being a largely historical method. [2]: 33 Any one watercraft might use more than one of these methods at different times or in conjunction with each other. For instance, early steamships often set sails to work alongside the engine power.
When this happens wetted surface area drops radically and the boats accelerate up to 1.2 to 1.5 times the speed of the prevailing wind. These boats are very light (all up weight is less than 40 kg) and very fast, They hydrofoil in as little as 8 knots (15 km/h) of breeze ("sit on the deck breeze" for most dinghy classes).
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