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The Hydra comes with the large book (800+ pages [6]) "Game programming for the propeller powered HYDRA", a CD with extensive software including demo games and a second book by LaMothe, a keyboard, a mouse, a NES keypad, USB and audio/video cables, a 128 KB "memory card", [7] an experimenter card and a power supply. [8] [9]
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 ...
In marine propulsion, a variable-pitch propeller is a type of propeller with blades that can be rotated around their long axis to change the blade pitch. Reversible propellers—those where the pitch can be set to negative values—can also create reverse thrust for braking or going backwards without the need to change the direction of shaft revolution.
A toroidal propeller is a type of propeller that is ring-shaped with each blade forming a closed loop. The propellers are significantly quieter at audible frequency ranges, between 20 Hz and 20 kHz, while generating comparable thrust to traditional propellers. In practice, toroidal propellers reduce noise pollution in both aviation and maritime ...
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 ...
Trumpeter plastic models of ships are produced in 1:200, 1:350, 1:500 and 1:700 scale, although 1:350 and 1:700 are dominating. Trumpeter has a cooperation with Japanese ship model manufacturer Pit-Road for kits in 1:700 scale. These kits are usually available under the Pit-Road label in Japan and under the Trumpeter label in the rest of the world.
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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]