SHIP FORM DEFINITION The Shape of a Ship

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1 SHIP FORM DEFINITION The Shape of a Ship

2 The Traditional Way to Represent the Hull Form A ship's hull is a very complicated three dimensional shape. With few exceptions an equation cannot be written that fully describes the shape of a ship. Therefore, naval engineers have placed great emphasis on the graphical description of hull forms. Until very recently, most of this work was done by hand. Today high-speed digital computers assist the engineer with the drawings, but they are not substitutes for imagination and judgment. Traditionally, the ship's hull form is represented graphically by a lines drawing. The lines drawing consists of projections of the intersection of the hull with a series of planes. The planes are equally spaced in each of the three dimensions (x, y, z). Planes in one dimension will be perpendicular to planes in the other two dimensions. We say that the sets of planes are mutually perpendicular or orthogonal planes.

3 Lines Drawing- Lines Plan

4 The points of intersection of these planes with the hull results in a series of lines that are projected onto a single plane located on the front, top, or side of the ship. This results in three separate projections, or views, called the Half-Breadth Plan, Sheer plan and Body Plan. The creation of the linesplan from 3D ship hull form The projection of lines onto three orthogonal planes

5 To visualize how a lines drawing works, place the ship in an imaginary rectangular box whose sides just touch the keel (baseline) and sides of the ship. The bottom, side and front of the box will serve as the basis for three orthogonal projection screens on which lines will be projected onto. The lines to be projected result from the intersection of the hull with planes that are parallel to each of the three orthogonal planes mentioned.

6 The Half-Breadth Plan- Waterline Plan- TOP VIEW Think about our imaginary box. The bottom of the box is a reference plane called the base plane. The base plane is usually level with the keel. A series of planes parallel and above the base plane are imagined at regular intervals. Each plane will intersect the ship's hull and form a line at the points of intersection. These lines are called waterlines and are all projected onto a single plane called the Half Breadth Plan.

7 Creation of the half-breadth plan Each waterline shows the true shape of the hull from the top view for some elevation above the base plane which allows this line to serve as a pattern for the construction of the ship s framing.

8 The waterlines referred to here have nothing to do with where the ship actually floats. These waterlines are the intersection of the ship s hull with some imaginary plane above the base plane. There will be one plane above the base plane that coincides with the normal draft (draught) of the ship, this waterline is called the Design Water Line or Loaded Waterline. This waterline is actually the waterline the ship floats. The design water line is often represented on drawings as DWL, LWL or. Since ships are symmetric about their centerline they only need be drawn for the starboard or port side, thus the name of Half Breadth Plan

9 The Sheer Plan -Profile plan SIDE VIEW A plane that runs from bow to stern directly through the center of the ship and parallel to the sides of the imaginary box is called the centerline plane. A series of planes parallel to one side of the centerline plane are imagined at regular intervals from the centerline. Each plane will intersect the ship's hull and form a curved line at the points of intersection. These lines are called buttocks and are all projected onto a single plane called the Sheer Plan. Centerline plane stern bow

10 The creation of the sheer plan Sheer line of the ship Profile of the ship Each buttock line shows the true shape of the hull from the side view for some distance from the centerline of the ship. This allows them to serve as a pattern for the construction of the ship s longitudinal framing. The centerline plane shows a special buttock called the profile of the ship. The sheer plan gets its name from the idea of a sheer line on a ship. The sheer line on a ship is the upward longitudinal curve on ship s deck. It is the sheer line of the vessel which gives it a pleasing aesthetic quality.

11 The Body Plan - FRONT VIEW Port side Starboard Port side side Body plan Starboard side Planes parallel to the front and back of the imaginary box running port to starboard are called stations or sections. A ship is typically divided into 11, 21, 31, or 41 evenly spaced stations. The larger the ship the more stations will be made. An odd number of stations results in an even number of equal blocks between the stations. The body plan takes advantage of the ship's symmetry. Only half of each section is drawn because the other half is identical. By convention, the sections forward of amidships are drawn on the right side, and the sections aft of amidships are drawn on the left side. The amidships section is generally shown on both sides of the body plan. The vertical line in the center separating the left and right half of the ship is called the centerline.

12 Each section line shows the true shape of the hull from the front view for some longitudinal position on the ship which allows this line to serve as a pattern for the construction of the ship s transverse framing. Each station plane will intersect the ship's hull and form a curved line at the points of intersection. These lines are called sectional lines or sections and are all projected onto a single plane called the Body Plan

13 grid lines for buttocks grid lines for waterlines USNA Patrol Craft - Body Plan

14 design waterline DWL or LWL

15

16 Sections

17 aft or stern bow or stem The first forward station at the bow is usually labeled station number zero. This forward station is called the forward perpendicular (FP). By definition the FP is located at a longitudinal position as to intersect the stem of the ship at the DWL. The after-most station is called the after perpendicular (AP). By definition the AP is located at a longitudinal position as to intersect the stern at the DWL for ships with a transom stern or alternatively through the rudder stock of the vessel. The station midway between the perpendiculars is called the midships station, usually represented by the symbol. The length between these perpendiculars has the symbol Lpp. Engineers typically use the Lpp for calculations. There is also an overall ship length LOA that might be a more useful number to use if you were docking the ship.

18 Nowadays the lines plans are being made with the aid of computer programs that have the possibility to transform the shape of the vessel automatically when modifications in the ship s design require this. If the linesplan is ready, the programs may be used to calculate among other things the volume and displacement of the ship.

19

20 Hullform characteristics All aspects concerning the measurements of seagoing vessels are arranged in the certificate of registry act of Perpendiculars The forward and after perpendiculars shall be taken at the forward and after ends of the length (Lpp ). The forward perpendicular shall coincide with the foreside of the stem on the water line on which the length is measured. FP Fore perpendicular AP Aft perpendicular BL - Base line STERN PART STEM PART T a T T f BL AP FP

21 Length between perpendiculars (L pp ) Distance between the fore and aft perpendicular Length over all (Loa) The horizontal distance from stem to stern Loaded waterline (Lwl) Horizontal distance between the stem and stern when the ship is on her summer mark. In other words the waterline of ship lying in the water. Draught (T) The depth of a ship's keel below the waterline. Trim The difference between the draught at the stem and stern Sheer STERN PART T a T T f STEM PART AP FP

22 DWL BL Breadth (B) The maximum breadth of the ship as measured from the outer hull on starboard to port side Depth (D) The vertical distance between the base line and upper deck. The depth is measured at midships.

23 Camber Turn of bilge Rise of floor Sheer The upward rise of a ship s deck from amidships towards the bow and stern Camber The curving of the weather deck which ensures drainage Rise of floor Unique to some types of vessels like tugboats and fishing boats. This is the upwards rise of the lower edges of the floors from keel towards the bilges Turn of bilge Gives the radius of the bilge of the ship

24 Freeboard. The freeboard assigned is the distance measured vertically downwards amidships from the upper edge of the deck line to the upper edge of the related design waterline or loaded waterline. Call it a safety bulb!! Freeboard Deck. The freeboard deck is normally the uppermost complete deck exposed to weather and sea, which has permanent means of closing all openings in the weather part and below which all openings in the sides of the ship are fitted with permanent means of watertight closing. DWL

25 Freeboard Load line Safe loading, weight and balance have always been very serious issues for seafarers. In England, Samuel Plimsoll became the moving force to establish safe loading as a rule of law in Through his efforts, safe loading standards were adopted and forced by law. The first International Convention on Load Lines, adopted in 1930, was based on the principle of reserve buoyancy, although it was recognized then that the freeboard should also ensure adequate stability and avoid excessive stress on the ship's hull as a result of overloading. Load line conventions were conceived as instruments to assign the maximum safe draught for ships to operate at sea.

26 Freeboard Mark

27 The freeboard mark shall consist of a ring 300 mm in outside diameter and 25 mm wide which is intersected by a horizontal line 450 mm in length and 25 mm in breadth, the upper edge of which passes through the centre of the ring. The centre of the ring shall be placed amidships and at a distance equal to the assigned summer freeboard measured vertically below the upper edge of the deck line.

28 Proportions

29 Volumes and weights

30

31

32 The cargo capacity determines the amount of money the ship makes

33 Ship Hull Form Coefficients

34

35 Graphical representation of block coefficient

36 A ship with a small block coefficient but a large midship section coefficient A ship with a large block coefficient but a large midship section coefficient

37 Prismatic coefficient Graphical representation of prismatic coefficient

38 Lets show a couple of lines plans that differ quite dramatically. The looker can tell from these lines plans that a ship would be slimmer with smaller coefficents and when the waterlines, section lines and buttocks are more closely spaced

39

40

41

42

43

44 DRAWINGS

45

46 Midship Section

47 Midship Section

48 Shell Expansion A shell expansion drawing may be created from any workshop design. The drawing shows the girth (measurement around the plates)positions of all parts (plate edges, stringers, frames and decks) from a specified datum position (usually, but not always, the baseline)

49

50 A typical shell expansion drawing

51 Other plans Construction plan Safety plan Docking plan Capacity plan

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