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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]
The momentum theory or disk actuator theory – a theory describing a mathematical model of an ideal propeller – was developed by W.J.M. Rankine (1865), A.G. Greenhill (1888) and R.E. Froude (1889). The propeller is modelled as an infinitely thin disc, inducing a constant velocity along the axis of rotation and creating a flow around the ...
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.
Reconstruction of a 19th-century naval architect's office, Aberdeen Maritime Museum General Course of Study leading to Naval Architecture degree Naval architecture, or naval engineering, is an engineering discipline incorporating elements of mechanical, electrical, electronic, software and safety engineering as applied to the engineering design process, shipbuilding, maintenance, and operation ...
Early marine propeller engines were geared upward, which is to say the propeller was geared to run at a higher rotational speed than the engine itself ran at. [ 52 ] [ 53 ] As engines became faster and more powerful through the latter part of the 19th century, gearing was almost universally dispensed with, and the propeller ran at the same ...
Henrietta Vansittart, née Lowe (1833 - 8 February 1883) was an English engineer and inventor, awarded a patent for a screw propeller called the Lowe-Vansittart propeller. She was self-trained and she is considered to be one of the first female engineers, with her concentration being on ship propulsion. [1] [2] [3]