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Model of Emma Mærsk undergoing testing in a ship model basin. In marine engineering, a ship motion test is hydrodynamic test performed with ship models for the purpose of designing a new (full sized) ship, or refining the design of a ship to improve its performance at sea. [1] Tests are carried out in a ship model basin or "towing tank". [2]
A folding propeller is a type of propeller whose blades automatically fold out when the engine is turning, and then fold back (or "feather") when the engine stops. Folding propellers are found on sailing yachts, on model airplanes, and increasingly on self-launching gliders and small motor gliders, such as the Aériane Swift PAS.
Whereas the propeller on a large ship will be immersed in deep water and free of obstacles and flotsam, yachts, barges and river boats often suffer propeller fouling by debris such as weed, ropes, cables, nets and plastics.
A propeller imparts momentum to a fluid which causes a force to act on the ship. [1] The ideal efficiency of any propulsor is that of an actuator disc in an ideal fluid. This is called the Froude efficiency and is a natural limit which cannot be exceeded by any device, no matter how good it is.
Currently the majority of model ships owned by Task Force 72 members are military vessels however this is slowly changing as more non-warships are completed. In fact the joint winners of the Wentworth Shield for best model at the 2007 Annual Regatta were two non-warships, the lighthouse and navigation aids tender Cape Don and the USS Charles Robinson, a Liberty Ship.
A ducted propeller, also known as a Kort nozzle, is a marine propeller fitted with a non-rotating nozzle. It is used to improve the efficiency of the propeller and is especially used on heavily loaded propellers or propellers with limited diameter. It was developed first by Luigi Stipa (1931) and later by Ludwig Kort (1934). The Kort nozzle is ...
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The true instigator of the 1:350 scale ship series was the British kit company Frog (models), which was started in 1932 by Joe Mansour and brothers Charles and John Wilmot. The first four years FROG focused on flying scale models, but in December 1936 they released the first three all-plastic kits, in a range called Penguin.