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  2. Outboard motor - Wikipedia

    en.wikipedia.org/wiki/Outboard_motor

    An outboard motor is a propulsion system for boats, consisting of a self-contained unit that includes engine, gearbox and propeller or jet drive, designed to be affixed to the outside of the transom. They are the most common motorised method of propelling small watercraft.

  3. 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 ...

  4. Island-class patrol boat - Wikipedia

    en.wikipedia.org/wiki/Island-class_patrol_boat

    In 2002 as part of the Integrated Deepwater System Program, the Coast Guard began refitting some of these vessels, adding 13 feet (4.0 m) to the stern to make room for a high-speed stern launching ramp, and replacing the superstructure so that these vessels had enough room to accommodate mixed-gender crews. The refit added about 15 tons to the ...

  5. 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 ...

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  7. Chopper (propeller) - Wikipedia

    en.wikipedia.org/wiki/Chopper_(propeller)

    Unlike a cleaver the chopper's trailing edge extends aft with a large chord line at each radius. Choppers provide good acceleration and top speed and generally have relatively high rake, which has the effect of increasing the boat's angle of attack without changing the motor trim. This trimming effect is mistakenly called 'bow lift'.

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  9. List of equipment of the United States Coast Guard - Wikipedia

    en.wikipedia.org/wiki/List_of_equipment_of_the...

    The Coast Guard's 47-foot primary heavy-weather boat used for search and rescue as well as law enforcement and homeland security. [14] Response Boat – Medium: 45' The Coast Guard has signed a multi-year contract for 180 Response Boat – Medium (RB-M) boats that were delivered starting in 2008 to replace the 41′ UTB boats.

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