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  2. Ducted propeller - Wikipedia

    en.wikipedia.org/wiki/Ducted_propeller

    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 ...

  3. Propeller - Wikipedia

    en.wikipedia.org/wiki/Propeller

    An advanced type of propeller used on the American Los Angeles-class submarine as well as the German Type 212 submarine is called a skewback propeller. As in the scimitar blades used on some aircraft, the blade tips of a skewback propeller are swept back against the direction of rotation. In addition, the blades are tilted rearward along the ...

  4. Marine thruster - Wikipedia

    en.wikipedia.org/wiki/Marine_thruster

    Depending on the size of the motors driving these propellers, they could draw an insignificant amount of power or a large amount of power that requires much caution to operate. Another smaller subset of positioning thrusters is those used for maneuvering unmanned aquatic vehicles like Guanay II AUV tested by scientists from Spain (Masmitja, 2018).

  5. Marine propulsion - Wikipedia

    en.wikipedia.org/wiki/Marine_propulsion

    Marine steam reciprocating engines, ca. 1905 A wind propelled fishing boat in Mozambique. Until the application of the coal-fired steam engine to ships in the early 19th century, oars or the wind were the principal means of watercraft propulsion.

  6. Pusher configuration - Wikipedia

    en.wikipedia.org/wiki/Pusher_configuration

    1871 Planophore A Farman MF.11, showing the classic Farman configuration with engine between tail booms Buhl A-1 Autogyro, the first pusher autogyro The post-WWII Convair B-36 was unusual in its size, era, number of engines, and combining both propeller and jet propulsion, with six radial piston and four jet engines Typical of many UAVs, the General Atomics MQ-9 Reaper has a propeller at the ...

  7. Riverboat - Wikipedia

    en.wikipedia.org/wiki/Riverboat

    Sightseeing boats can be found in Amsterdam, Paris, and other touristic cities where historical monuments are located near water. The concept of local waterborn public transport is known as water taxi in English-speaking countries, vaporetto in Venice, water/river tramway in former Soviet Union and Poland (although sightseeing boats can be ...

  8. Internal drive propulsion - Wikipedia

    en.wikipedia.org/wiki/Internal_drive_propulsion

    The primary difference between internal drive boats and external drive boats is that the propeller is enclosed inside the hull of an internal drive boat whereas the propeller is exposed outside the hull of a stern drive, V-drive or straight shaft drive boat. A conventional screw propeller accelerates a large volume of water by a small amount ...

  9. Outboard motor - Wikipedia

    en.wikipedia.org/wiki/Outboard_motor

    The pivoting design allows the outboard motor to be swiveled by the operator in almost all directions: Sideways for direction, up and down to change the thrust line according to speed or bow lift, elevate completely out of water for easy starting, placing the drive shaft and the propeller forward along the side of the boat for reverse, or put ...

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