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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.
The turbosail or French turbovoile is a marine propulsion system using a sail-like vertical surface and a powered boundary layer control system to improve lift across a wide angle of attack. This allows the sail to power the boat in any direction simply by moving a single flap at the back of the sail, unlike conventional sails which have to be ...
Marine steam reciprocating engines, ca. 1905 A wind propelled fishing boat in Mozambique. Until the application of the coal-fired steam engine to ships in the early 19th century, oars or the wind were the principal means of watercraft propulsion.
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.
Oceanbird is a concept for wind-powered cargo vessels under development by Wallenius Marine.The concept aims to lower emissions by up to 90 percent [1] [2] and the design was developed in collaboration with KTH Royal Institute of Technology and Swedish maritime technology company SSPA.
Illustration of windpower-inspired axial-flow turbine used for marine power generation. There are several types of open-flow devices that can be used in marine-current-power applications; many of them are modern descendants of the water wheel or similar. However, the more technically sophisticated designs, derived from wind-power rotors, are ...
Large enough wind generators could produce a completely wind-powered electric boat. No such boats are yet known although a few mechanical wind turbine powered boats exist. In hybrid electric boats, if a boat has an internal combustion engine anyway, then its alternator will provide significant charge when it is running.
6 × Fairbanks-Morse model 8-1/8OP, 10-cylinder opposed piston engines at 2,000 shp (1,500 kW), each driving a Westinghouse DC electric generator. Propulsion 2 × Westinghouse Electric DC electric motors driving the 2 aft propellers, 1 × 3,000 shp (2,200 kW) Westinghouse DC electric motor driving the detachable and seldom used bow propeller.