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A Mark 46 Mod 5A torpedo is inspected aboard a destroyer in April 2005. Contra-rotating propellers have benefits when providing thrust in marine applications. Contra-rotating propellers are used on torpedoes due to the natural torque compensation and are also used in some motor boats.
Tugboats and fishing trawlers are the most common application for Kort nozzles as highly loaded propellers on slow-moving vessels benefit the most. Nozzles have the additional benefits of reducing paddlewheel-effect (e.g. the tendency of a right-hand propeller to back to the left) and reduce bottom suction while operating in shallow water.
A coracle is a small, rounded, [1] lightweight boat of the sort traditionally used in Wales, and also in parts of the west of Ireland and also particularly on the River Boyne, [2] and in Scotland, particularly the River Spey. The word is also used for similar boats found in India, Vietnam, Iraq, and Tibet. [3]
The first such ship to use the Voith Schneider propeller was the excursion boat Kempten. Two German 1935-type M class minesweepers M-1 and M-2 were fitted with VSPs. The first British ship to use Voith Schneider propellers was the double-ended Isle of Wight ferry MV Lymington , launched in 1938.
[clarification needed] The choice between using thrusters or traditional propellers to propel marine vessels is a compromise between versatility and efficiency. Propellers are designed to work in-line with a propulsion plant and produce one-directional thrust while thrusters are more customizable and have a more versatile application.
English inventor Francis Ronalds described what he called a propelling rudder in 1859 that combined the propulsion and steering mechanisms of a boat in a single apparatus. . The propeller was placed in a frame having an outer profile similar to a rudder and attached to a vertical shaft that allowed the device to rotate in plane while spin was transmitted to the propell
The drive unit transmits power from the inboard engine, generally mounted above the waterline, outboard through the transom and downward to the propellers below the waterline. [1] The propellers lie about 27 inches further forward than the props of a Duoprop and move from an exposed position beyond the transom to underneath the hull, away from ...
Due to the high construction cost none of these vessels ever returned a profit over their lifetimes. For these vessels, fixed variable-pitch propellers would have been more appropriate. [2] Controllable-pitch propellers are usually found on harbour or ocean-going tugs, dredgers, cruise ships, ferries, cargo vessels and larger fishing vessels ...
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