Ship DrawingShip Drawing

Lines Plan of Different Ship Lines Plan of Different Ship TypesTypes

Ship Types & Hull FormsShip Types & Hull Forms

Ships can be Classified by their Ships can be Classified by their usage into:usage into:1.Merchant Ships

2.Ferries

3.Service Ships (Tugs)

4.War Ships

5.Luxury and fun Boats

Ship Types & Hull FormsShip Types & Hull Forms

Marine Vessels can be Classified by Marine Vessels can be Classified by their support into:their support into:

1.Aerostatic Support (Hover Crafts)

2.Hydrodynamic Support ( Hydrofoils – Planning Hulls)

3.Hydrostatic Support ( SWATH – Catamaran – Ships – Submarines)

Ship AxisShip Axis The The x-axisx-axis is t is the length of the ship, from

which stations are measured. The The y-axisy-axis is is the width of the ship, from

which buttocks are measured. The The z-axisz-axis is t 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.

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 OffsetsTable of Offsets

• Lines - body plan (front View) - shear plan (side view) - half breadth plan (top view)

Half – Breadth PlanHalf – Breadth Plan

IIntersection of planes (waterlines) parallel to the baseline (keel).

Shear Plan

Intersection of planes (buttock lines) parallel to the centerline plan

Body Plan

Intersection of planes to define section line.

Basic Dimensions and Hull Form Characteristics

• LOALOA(length over all )(length over all ) : overall length of the vessel• DWLDWL(design waterline)(design waterline) : water line where the ship is designed to float• FPFP(forward perpendicular)(forward perpendicular) : imaginary vertical line where the bow intersects the DWL• APAP(aft perpendicular)(aft perpendicular) : imaginary vertical line located at either the rudder stock or intersection of the stern with DWL

LBP

DWL

Shear

LOA

FPAP

Basic Dimensions and Hull Form Characteristics

• LBP LBP (length between perpendicular) : horizontal distance

from FP and AP • AmidshipsAmidships : the point midway between FP and AP• ShearShear : longitudinal curvature given to deck

LBP

DWL

Shear

LOA

FPAP

Beam: B Camber

Depth: D

Draft: T

FreeboardWL

KCL

View of Mid-Ship section

• Depth(D):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)Draft(T) : vertical distance from keel to the water surface• Beam(B)Beam(B) : transverse distance across the each section

Breadth(B)Breadth(B) : transverse distance measured amidships

Beam: B Camber

Depth: D

Draft: T

FreeboardWL

KCL

View of Mid-Ship sectionView of Mid-Ship section

• FreeboardFreeboard : distance from depth to draft (reserve buoyancy)• Keel(K)Keel(K) : locate the bottom of the ship • CambeCamberr : transverse curvature given to deck

FlareFlare TumblehomTumblehomee

• FlareFlare : outward curvature of ship’s hull surface above the waterline

• Tumble HomeTumble Home : opposite of flare

Drawing Ship LinesDrawing Ship LinesDrawing Lines Plan

Non – Dimensional Offset Non – Dimensional Offset TableTable

WL 0 WL 0.5 WL 1 WL 2 WL 3 WL 4 WL 5 WL 6 WL 7 WL 8 WL 9A.P. 0 0 0 0 0 0 0.143777 0.328895 0.461358 0.55718 0.620801ST 1 0.024473 0.065013 0.072933 0.072933 0.086684 0.170409 0.367972 0.545692 0.667276 0.735683 0.763795ST 2 0.047224 0.134639 0.16275 0.191558 0.242907 0.369017 0.548477 0.700261 0.798085 0.853612 0.881984ST 3 0.111401 0.217755 0.27537 0.342994 0.429417 0.556049 0.694691 0.807137 0.884769 0.928111 0.950653ST 4 0.191471 0.312359 0.403046 0.519321 0.609748 0.712359 0.807746 0.88503 0.944299 0.975022 0.989991ST 5 0.255004 0.436815 0.549608 0.681114 0.762663 0.836466 0.895387 0.941253 0.975457 0.993037 1ST 6 0.374238 0.56745 0.696084 0.814534 0.875631 0.916884 0.948564 0.974326 0.988773 1 1ST 7 0.501305 0.708181 0.82376 0.920017 0.952654 0.971192 0.990513 1 1 1 1ST 8 0.62074 0.820366 0.915057 0.97624 0.987728 1 1 1 1 1 1ST 9 0.693464 0.876545 0.949521 1 1 1 1 1 1 1 1AMIDSHIP 0.672472 0.852742 0.939164 0.991558 1 1 1 1 1 1 1ST 11 0.591819 0.785292 0.897737 0.97537 0.990513 0.990513 0.992602 0.992602 0.992602 1 1ST 12 0.437772 0.683464 0.827763 0.919234 0.947433 0.949695 0.958747 0.963795 0.975283 0.989121 1ST 13 0.308964 0.553351 0.720453 0.83342 0.871105 0.889817 0.898782 0.907137 0.927154 0.956397 1ST 14 0.195822 0.433159 0.601218 0.720104 0.76832 0.788686 0.804439 0.827937 0.859182 0.905657 0.973281ST 15 0.104439 0.316536 0.46423 0.596345 0.640383 0.664926 0.687119 0.708007 0.759617 0.827676 0.925587ST 16 0.055614 0.204352 0.325587 0.450653 0.498433 0.526458 0.549608 0.582855 0.633507 0.714186 0.840209ST 17 0.038033 0.129591 0.206876 0.311488 0.35074 0.379634 0.405831 0.440905 0.502872 0.589382 0.707659ST 18 0.010009 0.066144 0.112533 0.180592 0.214708 0.237337 0.25866 0.296258 0.35074 0.436466 0.561793ST 19 0 0 0.037598 0.075022 0.095997 0.110966 0.130722 0.156658 0.203481 0.267624 0.364839F.P. 0 0 0 0 0 0 0 0.030983 0.060226 0.104961 0.164839

WL 0 WL 0.5 WL 1 WL 2 WL 3 WL 4 WL 5 WL 6 WL 7 WL 8 WL 9Stern 0.015936 0.01753 0.019124 0.021514 0.019124 0.010359 -0.0247 -0.03904 -0.04303 -0.04701 -0.04861Bow 0.900398 0.938247 0.959363 0.98008 0.988048 0.994024 1 1.005976 1.011315 1.018327 1.026295