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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. Radio-controlled boat - Wikipedia

    en.wikipedia.org/wiki/Radio-controlled_boat

    Scale model tug boats are often built to include scale drive systems. They use standard propellers and rudder(s), Becker rudders, Kort nozzles, steerable kort nozzles, Z-drives or Voith-Schneider cycloidial drives. Clubs will often host maneuvering competitions where participants are tasked to run their boats in the most realistic manner possible.

  4. Azimuth thruster - Wikipedia

    en.wikipedia.org/wiki/Azimuth_thruster

    Azimuth thrusters on the tug Oued el Kebir - note the Kort nozzles. There are two major variants, based on the location of the motor: [citation needed] Mechanical transmission, which connects a motor inside the ship to the outboard unit by gearing. The motor may be diesel or diesel-electric.

  5. Propulsor - Wikipedia

    en.wikipedia.org/wiki/Propulsor

    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. It also has a rotor element and a stator. The stator concentrates the thrust in axial direction and reduces energy wasted in the tangential flow ...

  6. Ludwig Kort - Wikipedia

    en.wikipedia.org/wiki/Ludwig_Kort

    Ludwig Kort (1888 - 1958 [1]) was a German fluid dynamicist known for developing the ducted propeller, or Kort nozzle. In an attempt to reduce canal erosion , Kort discovered that directing the wake of a propeller through a short, stationary nozzle also increased thrust . [ 2 ]

  7. Tugboat - Wikipedia

    en.wikipedia.org/wiki/Tugboat

    The Kort nozzle is a sturdy cylindrical structure around a special propeller having minimum clearance between the propeller blades and the inner wall of the Kort nozzle. The thrust-to-power ratio is enhanced because the water approaches the propeller in a linear configuration and exits the nozzle the same way.

  8. Ville-class tug - Wikipedia

    en.wikipedia.org/wiki/Ville-class_tug

    Their kort-nozzle allows for a greater bollard pull however it loses its pull at anything over 10 knots (19 km/h; 12 mph) and loses speed in turns. [3] The Ville class are 13.71 m (45 ft 0 in) long with a beam of 4.72 m (15 ft 6 in) and a draught of 2.74 m (9 ft 0 in).

  9. USCGC Harry Claiborne - Wikipedia

    en.wikipedia.org/wiki/USCGC_Harry_Claiborne

    The Z-drives have four-bladed propellers which are 57.1 inches (145 cm) in diameter [9] and are equipped with Kort nozzles. They can be operated in "tiller mode" where the Z-drives turn in the same direction to steer the ship, or in "Z-conn mode" where the two Z-drives can turn in different directions to achieve specific maneuvering objectives.