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ABB provided an azimuth thruster for ShinNihonkai Ferries in form of the CRP Azipod, [2] claiming efficiency gains from the propeller (about 10% increase [3]) and a simpler hull design. Volvo Penta have launched the IPS ( Inboard Performance System ), [ 4 ] an integrated diesel, transmission and pulling contra-rotating propellers for motor yachts.
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 ...
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.
Single-blade propeller drawing Single-blade propeller and glider drawing. A single-blade propeller may be used on aircraft to generate thrust.Normally propellers are multi-blades but the simplicity of a single-blade propeller fits well on motorized gliders, because it permits the design of a smaller aperture of the glider fuselage for retraction of the power plant.
Although the traditional boat hook is still available, various different materials, such as aluminium and even a rolled up polymer are now available. [3] Although the boat hook is a general purpose reaching and holding-off tool on boats, there are more specialised forms, such as the Recovery Pole [4] designed for length rather than the rigid strength of a boat hook.
Ship's boat fitted with "portable" echo-sounding gear, 1930s Technical developments over the years improved surveying methods and the accuracy of the charts. For depth determination, methods of measuring depth from a moving ship were developed, as well as "sweeping", dragging a horizontal line across an area to detect hazards that might be ...
The uni knot is widely used for attaching hooks, rings and swivels to the end of the line [7] and it is also used for joining two fishing lines together. [8] The bend form of the uni knot (for joining two lines) is not a noose; rather it is akin to a multiple fisherman's knot with the two opposing knotted parts arranged in the manner of uni knots.
A simple 3 blade toroidal propeller. 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.