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2. Ducted propeller - Wikipedia

   en.wikipedia.org/wiki/Ducted_propeller

   Kort nozzle The towboat Dolphin I in a floating drydock on the Mississippi River in Algiers, Louisiana. 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 ...

3. Solutions for cavitation in marine propellers - Wikipedia

   en.wikipedia.org/wiki/Solutions_for_Cavitation...

   A nozzle system uses a set of nozzles to help reduce and prevent the likelihood of cavitation in propellers. This system was developed by Samsung Heavy Industries , based in South Korea. In order to reduce the possibility of cavitation happening in marine propellers, a set of nozzles are placed on the hull of the ship directly in front of the ...

4. Marine propulsion - Wikipedia

   en.wikipedia.org/wiki/Marine_propulsion

   In modern times, human propulsion is found mainly on small boats or as auxiliary propulsion on sailboats. Human propulsion includes the push pole, rowing, and pedals. Propulsion by sail generally consists of a sail hoisted on an erect mast, supported by stays , and controlled by lines made of rope .

5. Azimuth thruster - Wikipedia

   en.wikipedia.org/wiki/Azimuth_thruster

   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

6. Propulsor - Wikipedia

   en.wikipedia.org/wiki/Propulsor

   The word is commonly used in the marine vernacular, and implies a mechanical assembly that is more complicated than a propeller. The Kort nozzle, pump-jet and rim-driven thruster are examples. An example propulsor is shown in the accompanying picture. It has a shroud which cuts down on blade-tip cavitation and radiated noise.

7. Z-drive - Wikipedia

   en.wikipedia.org/wiki/Z-drive

   Saildrive – Non-steerable propeller drive leg, a Z-drive with fixed azimuth, for sailboats; Propulsor – Mechanical device to propel a vessel; Voith Schneider propeller – Perpendicular axis marine propulsion system; L-drive; Ducted propeller – Marine propeller with a non-rotating nozzle; Sterndrive – Type of boat engine