1. Lines Plan of Different Ship Types
Ship Drawing
Lines Plan of Different Ship Types

2. Ship Types & Hull Forms Ships can be Classified by their usage into:
Merchant Ships
Ferries
Service Ships (Tugs)
War Ships
Luxury and fun Boats

3. 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)

4. 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.

5. 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)

7. Half – Breadth Plan
Intersection of planes (waterlines) parallel to the baseline (keel).

8. Shear Plan
Intersection of planes (buttock lines) parallel to the centerline plan

9. Body Plan
Intersection of planes to define section line.

10. 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

11. 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

12. 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

13. 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

14. Flare
Tumblehome
Flare : outward curvature of ship’s hull surface above the waterline
Tumble Home : opposite of flare

15. Drawing Ship Lines
Drawing Lines Plan

16. Non – Dimensional Offset Table