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Trailer skirts comprise a pair of panels affixed to the lower side edges of a trailer, running most of the length of the trailer and filling the gap between the forward and rear axles. Trailer skirts are typically constructed of aluminum , plastic , or fiberglass , with plastic the most resistant to damage from side or bottom impacts. [ 2 ]
A wind transducer is a device used by sailors to receive a real-time measurement of wind speed and direction. [1] [2] A wind transducer is usually mounted on the masthead of a sailing boat and is occasionally used by power boats too. The wind speed and direction measurements are more critical to sailing boats than to power boats.
A sail is a tensile structure, which is made from fabric or other membrane materials, that uses wind power to propel sailing craft, including sailing ships, sailboats, windsurfers, ice boats, and even sail-powered land vehicles. Sails may be made from a combination of woven materials—including canvas or polyester cloth, laminated membranes or ...
A wingsail, twin-skin sail [1] or double skin sail [2] is a variable-camber aerodynamic structure that is fitted to a marine vessel in place of conventional sails. Wingsails are analogous to airplane wings , except that they are designed to provide lift on either side to accommodate being on either tack .
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."
Sail components include the features that define a sail's shape and function, plus its constituent parts from which it is manufactured. A sail may be classified in a variety of ways, including by its orientation to the vessel (e.g. fore-and-aft) and its shape, (e.g. (a)symmetrical, triangular, quadrilateral, etc.).
An asymmetric spinnaker is particularly effective on fast planing dinghies and ultra-light displacement boats as their speed generates an apparent wind on the bow allowing them to sail more directly downwind. An asymmetric spinnaker can also be a simpler sail for a cruiser or short-handed sailer than a symmetric one. [7]
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.