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  2. Liftboat - Wikipedia

    en.wikipedia.org/wiki/Liftboat

    Because the pads of the liftboat are sitting on a muddy, unstable seafloor, most liftboats practice a safety measure called a preload, where the boat jacks-up the absolute minimum to clear hull from the tips of the significant wave heights, [3] fills its holds with water for weight and allows the boat to settle in the mud for several hours ...

  3. Forces on sails - Wikipedia

    en.wikipedia.org/wiki/Forces_on_sails

    In reference to the above diagrams relating lift and drag, Garrett explains that for a maximum speed made good to windward, the sail must be trimmed to an angle of attack that is greater than the maximum lift/drag ratio (more lift), while the hull is operated in a manner that is lower than its maximum lift/drag ratio (more drag).

  4. Jack (device) - Wikipedia

    en.wikipedia.org/wiki/Jack_(device)

    A jack is a mechanical lifting device used to apply great forces or lift heavy loads. A mechanical jack employs a screw thread for lifting heavy equipment. A hydraulic jack uses hydraulic power. [1] The most common form is a car jack, floor jack or garage jack, which lifts vehicles so that maintenance can be performed. Jacks are usually rated ...

  5. Jackup rig - Wikipedia

    en.wikipedia.org/wiki/Jackup_rig

    Jackup platforms have been the most popular and numerous of various mobile types in existence. The total number of jackup drilling rigs in operation numbered about 540 at the end of 2013. The tallest jackup rig built to date is the Noble Lloyd Noble, completed in 2016 [3] with legs 214 metres (702 feet) tall. [4]

  6. Glossary of nautical terms (A–L) - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_nautical_terms...

    [3] 2. Above the ship's uppermost solid structure. [3] 3. Overhead or high above. alongside By the side of a ship or pier. [3] ama A secondary hull or float attached to the primary hull of a vessel for stability, or the hulls of a modern catamaran. amidships 1. A position half way along the length of a ship or boat. [13] 2.

  7. Lift-off oversteer - Wikipedia

    en.wikipedia.org/wiki/Lift-off_oversteer

    Lift-off oversteer (also known as trailing-throttle oversteer, throttle off oversteer, or lift-throttle oversteer) is a form of sudden oversteer.While cornering, a driver who closes the throttle (by lifting a foot off the accelerator, hence the name), usually at a high speed, can cause such sudden deceleration that the vertical load on the tires shifts from rear to front, in a process called ...

  8. Jackscrew - Wikipedia

    en.wikipedia.org/wiki/Jackscrew

    A machinist's jack is a miniature screw jack used to support protruding parts of a workpiece or to balance clamping forces on that workpiece during machining operations. Aside from their size, these frequently look no different from the screw jacks used to lift buildings off their foundations.

  9. Two half-hitches - Wikipedia

    en.wikipedia.org/wiki/Two_half-hitches

    To help avoid this problem, tie a slipped variation: in the second half-hitch, pass through a bight, as when tying your shoe, rather than the entire free end. The buntline hitch , when bent to a yard, makes a more secure knot than two half hitches, but is more liable to jam.

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