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To reduce the energy required to propel the boat, windmill ships are often equipped with low-friction hull designs, such as multihulls, or they are hydrofoils. Boats without low-friction hulls or hydrofoils can be equipped with wind turbines, but often the force generated by the turbines alone is not sufficient to propel the craft.
According to the Cousteau Society, "when compared to the thrust coefficient of the best sails ever built (Marconi or square types, i.e. ships of the American Cup [sic] or the Japanese wind propulsion system) that of the turbosail is 3.5 to 4 times superior and gives the system a unique advantage for the economical propulsion of ships."
The boat has a draft of 5.67 ft (1.73 m) with the lifting extended and 2.00 ft (0.61 m) with it retracted, allowing operation in shallow water or ground transportation on a trailer. [ 1 ] [ 2 ] [ 3 ] The boat is normally fitted with a small 3 to 6 hp (2 to 4 kW) outboard motor for docking and maneuvering.
Wind-assisted propulsion is the practice of decreasing the fuel consumption of a merchant vessel through the use of sails or some other wind capture device. Sails used to be the primary means of propelling ships , but with the advent of the steam engine and the diesel engine , sails came to be used for recreational sailing only.
The apparent wind on the sail creates a total aerodynamic force, which may be resolved into drag—the force component in the direction of the apparent wind—and lift—the force component normal (90°) to the apparent wind. Depending on the alignment of the sail with the apparent wind, lift or drag may be the predominant propulsive component.
Even in sailboats running under engine, the self steering gear can be used to keep the boat heading into the wind to easily set or change sails (exception: sheet-to-tiller principle). As wind direction sensors are used a) a wind vane mounted on an axis being tilted more or less towards the horizon (wind vane self-steering)
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Energy Observer is a former race boat that has been reconditioned: Built in Canada in 1983 by naval architect Nigel Irens, under the supervision of sailor Mike Birch, the maxi-multihull marked the evolution of its successors. [9] Baptised Formule TAG, it was the first racing sailboat to break the symbolic 500 miles limit in 24 hours in 1984. [10]
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