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    Definition and Meaning

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    jacky
    This document defines key terms used to describe the dimensions and features of a ship's hull, including: length overall, forward and aft perpendiculars, length between perpendiculars, amidships, breadth, baseline, depth, freeboard, sheer, camber, rise of the floor, tumblehome, flare, and rake of the stem and keel. It provides the definitions of these technical shipbuilding terms.

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    Definition and Meaning

    Uploaded by

    jacky
    35 views9 pages
    This document defines key terms used to describe the dimensions and features of a ship's hull, including: length overall, forward and aft perpendiculars, length between perpendiculars, amidships, breadth, baseline, depth, freeboard, sheer, camber, rise of the floor, tumblehome, flare, and rake of the stem and keel. It provides the definitions of these technical shipbuilding terms.

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    Definition and meaning

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    This document defines key terms used to describe the dimensions and features of a ship's hull, including: length overall, forward and aft perpendiculars, length between perpendiculars, amidships, breadth, baseline, depth, freeboard, sheer, camber, rise of the floor, tumblehome, flare, and rake of the stem and keel. It provides the definitions of these technical shipbuilding terms.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    35 views9 pages

    Definition and Meaning

    Uploaded by

    jacky
    This document defines key terms used to describe the dimensions and features of a ship's hull, including: length overall, forward and aft perpendiculars, length between perpendiculars, amidships, breadth, baseline, depth, freeboard, sheer, camber, rise of the floor, tumblehome, flare, and rake of the stem and keel. It provides the definitions of these technical shipbuilding terms.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 9

    UNIT 3 DEFINITIONS & MEANINGS

    UNIT 3 DEFINITIONS & MEANINGS


    UNIT 3 DEFINITIONS & MEANINGS
    • LENGTH OVERALL (LOA) : Maximum length of the
    ship taken over all extremities. Useful for
    manoeuvering operations like berthing etc.
    • AFT PERPENDICULAR : Perpendicular drawn to the
    water line through the point where the aft side of
    the rudder post meets the summer load line.
    • FORWARD PERPENDICULAR : Perpendicular
    drawn to the water line through the point where
    the fore side of the stem meets the summer load
    line.
    UNIT 3 DEFINITIONS & MEANINGS
    • LENGTH BETWEEN PERPENDICULARS : Length between
    the forward and the aft perpendiculars measured along
    the summer load line.
    • AMIDSHIPS : Point midway between the forward and
    the aft perpendiculars.
    • BREADTH – MOULDED : Maximum dimensions from
    side to side (usually at midships), measured from inside
    of shell plating to inside of the shell plating.
    • BREADTH – EXTREME : Maximum dimensions from side
    to side (usually at midships), measured from outside of
    shell plating to outside of the shell plating
    UNIT 3 DEFINITIONS & MEANINGS
    • BASELINE : Imaginary horizontal datum line drawn
    through the upper edge of the keel used as a
    reference line for all vertical measurements.
    • DEPTH – MOULDED : Depth of the vessel at ship’s
    side from the upper deck to the baseline (inside of
    the ship’s plating).
    • DEPTH – EXTREME : Depth of the vessel at ship’s side
    from the upper deck to the baseline (outside of the
    ship’s plating).
    • FREEBOARD: Vertical distance measured at the ship’s
    side between the summer loadline and the
    uppermost continuous deck.
    UNIT 3 DEFINITIONS & MEANINGS
    • SHEER : Curvature of the uppermost continuous deck
    in the longitudinal direction towards the bow and
    stern. Helps keep seas to a minimum in bad weather.
    • CAMBER : Curvature of the decks in the transverse
    direction, that is, towards the sides. Ensures that
    shipped seas drain off the decks as fast as possible
    especially in cases of ships which sail with a low
    freeboard, like loaded tankers.
    • RISE OF THE FLOOR : Rise of the bottom shell plating
    in the transverse direction above the Baseline from
    the keel towards the sides. This feature is rather
    obsolete and rarely found on modern ships.
    UNIT 3 DEFINITIONS & MEANINGS
    • TUMBLEHOME: Inward curvature of the shell plating
    at the sides. See figure. Modern ships tend to have
    vertical ship sides, and this feature is also seldom
    found on ships today.
    • FLARE : Outward curvature of the vessel’s bow
    plating.
    – (i) Helps increase buoyancy and prevents the bow from
    diving into head seas. Provides lifting power when
    pitching heavily.
    – (ii) Increases the breadth of the forecastle and provides
    space for the mooring gear to be fitted and for working.
    – (iii) Enables anchors to fall clear when let go
    UNIT 3 DEFINITIONS & MEANINGS
    • RAKE : STEM – Inclination of the stem line to the
    vertical.
    • RAKE : KEEL - Inclination of the keel line above
    horizontal (base line)
    Ship’s Hull

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