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V12 marine diesel engines . Human-powered paddles and oars, and later, sails were the first forms of marine propulsion. Rowed galleys, some equipped with sail, played an important early role in early human seafaring and warfares. The first advanced mechanical means of marine propulsion was the marine steam engine, introduced in the early 19th ...
The shape of a sail is defined by its edges and corners in the plane of the sail, laid out on a flat surface. The edges may be curved, either to extend the sail's shape as an airfoil or to define its shape in use. In use, the sail becomes a curved shape, adding the dimension of depth or draft.
A warship propelled by oars with a sail for use in a favourable wind Galliot Name refers to several types of sailing vessel, usually two-masted Gunboat Various small armed vessels, originally sail and later powered Hydrofoil A ship whose hull is fitted underneath with shaped vanes (foils) which lift the hull out of the water at speed. Ironclad
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.).
Fore-and-aft sails with booms, gaffs or sprits are unstable when the free end points into the eye of the wind and must be controlled to avoid a violent change to the other side; square rigs as they present the full area of the sail to the wind from the rear experience little change of operation from one tack to the other; and windsurfers again ...
Defined by sail plan. All masts have fore-and-aft sails. Schooner: fore-and-aft rigged sails, with two or more masts, the aftermost mast taller or equal to the height of the forward mast(s) All masts have square sails. Brig: two masts, square rigged (may have a spanker on the aftermost) Full-rigged ship: three or more masts, all of them square ...
Full forms such as oil tankers will have a high C b where fine shapes such as sailboats will have a low C b. = Midship coefficient (C m or C x) is the cross-sectional area (A x) of the slice at midships (or at the largest section for C x) divided by beam x draft. It displays the ratio of the largest underwater section of the hull to a rectangle ...