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  2. Stuffing box - Wikipedia

    en.wikipedia.org/wiki/Stuffing_box

    A small boat stuffing box comprising an adjusting nut, a locking nut and a sleeve. On a boat having an inboard motor that turns a shaft attached to an external propeller, the shaft passes through a stuffing box, also called a "packing box" or "stern gland" in this application. The stuffing box prevents water from entering the boat's hull.

  3. 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'.

  4. 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 ...

  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 ...

  6. Jesus nut - Wikipedia

    en.wikipedia.org/wiki/Jesus_nut

    The Main rotor attach nut, or "Jesus nut", from a Bell 222U, shown in hand for size perspective (left) and installed with locking key (right). Jesus nut is a slang term for the main rotor retaining nut [1] or mast nut, which holds the main rotor to the mast of some helicopters.