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Lecture 2 – Reference ship – big data - Coggle Diagram
Lecture 2 – Reference ship – big data
Terminology
Vessel
A water-born vehicle that has its own or external power production and steering
Ship
A large water-born vehicle that has its own power production and steering (A ship is
an vessel, but a vessel is not necessary a ship)
Yacht
A medium-size water-born vehicle used for leisure (Larger than a boat, smaller than
a ship)
Boat
A small water-born vehicle propelled by oars, paddle, sails, or motor for travelling,
transport, leisure
Reference ship
A ship that is similar to a ship being designed
Flag of convenience
A flag of a country (flag state) under which a ship is registered in order to avoid financial charges, or restrictive regulations in the owner's country
Camber
A measure how the deck’s curvature
Turn of bilge
Measure of the rounding between the ship side and bottom
Rise of floor
A measure of the hull shape
Physical Limitations
Weight limited
Volume limited
Limited by
main dimensions
Main Dimensions
Length (L)
Horizontal distance between bow and stern
Breadth / Beam (B)
Horizontal distance between ship sides
Draught / Draft (T)
Vertical distance between floating plane and keel
Depth (D)
Vertical distance between main deck and keel
Freeboard (F)
The vertical distance measured from the deck to the waterline
Area measures
Area of waterplane (AWP) is horizontal section cut at floating position
Area at amidships (AM) is the area closed by molded hull line and the floating plane, usually equaling the main frame area at midship
Wetted surface, (S), is the area in
touch with surrounding water
Weights
Lightship weight ≈ a ships own weight
Deadweight ≈ the weight of what a ship is carrying
Displacement
Lightship weight + Deadweight = Total ship weight
The displacement is the weight of the volume of water displaced by the ship.
Tonnage
Gross tonnage (GT)
Net tonnage
Load line mark
Define the maximum legal limit to which a ship can be loaded for various operating
Salt/sea water
• T – Tropical waters
• S – Summer temperate water
• W – Winter temperate water
Fresh water
• F – Fresh water
• TF – Tropical fresh water
Ship Coefficients
Block Coefficient (CB)
Waterplane area coefficient (CW)
Mid ship section area coefficient (CM)
Prismatic coefficient (CP)