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Lines Plan of Different Ship Types
Ship Drawing Lines Plan of Different Ship Types
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Ship Types & Hull Forms Ships can be Classified by their usage into:
Merchant Ships Ferries Service Ships (Tugs) War Ships Luxury and fun Boats
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Ship Types & Hull Forms Marine Vessels can be Classified by their support into: Aerostatic Support (Hover Crafts) Hydrodynamic Support ( Hydrofoils – Planning Hulls) Hydrostatic Support ( SWATH – Catamaran – Ships – Submarines)
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Ship Axis The x-axis is the length of the ship, from which stations are measured. The y-axis is the width of the ship, from which buttocks are measured. The z-axis is the height of the ship, from which water planes are measured. y z x The origin is the intersection of Keel – C.L. – A.P.
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Ship Hull Form and Geometry
Since the ship is a 3-dimensional shape, data in x, y and z directions is necessary to represent the ship hull. Table of Offsets Lines - body plan (front View) - shear plan (side view) - half breadth plan (top view)
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Half – Breadth Plan Intersection of planes (waterlines) parallel to the baseline (keel).
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Shear Plan Intersection of planes (buttock lines) parallel to the centerline plan
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Body Plan Intersection of planes to define section line.
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Basic Dimensions and Hull Form Characteristics
LBP DWL Shear LOA FP AP LOA(length over all ) : overall length of the vessel DWL(design waterline) : water line where the ship is designed to float FP(forward perpendicular) : imaginary vertical line where the bow intersects the DWL AP(aft perpendicular) : imaginary vertical line located at either the rudder stock or intersection of the stern with DWL
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Basic Dimensions and Hull Form Characteristics
LBP DWL Shear LOA FP AP LBP (length between perpendicular) : horizontal distance from FP and AP Amidships : the point midway between FP and AP Shear : longitudinal curvature given to deck
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View of Mid-Ship section
Beam: B Camber Depth: D Draft: T Freeboard WL K C L View of Mid-Ship section Depth(D): vertical distance measured from keel to deck taken at amidships and deck edge in case the ship is cambered on the deck. Draft(T) : vertical distance from keel to the water surface Beam(B) : transverse distance across the each section Breadth(B) : transverse distance measured amidships
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View of Mid-Ship section
Beam: B Camber Depth: D Draft: T Freeboard WL K C L View of Mid-Ship section Freeboard : distance from depth to draft (reserve buoyancy) Keel(K) : locate the bottom of the ship Camber : transverse curvature given to deck
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Flare Tumblehome Flare : outward curvature of ship’s hull surface above the waterline Tumble Home : opposite of flare
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Drawing Ship Lines Drawing Lines Plan
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Non – Dimensional Offset Table
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