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Naval Architecture Glossary > Glossary and Definitions > Flashcards

Glossary and Definitions Flashcards

1
Q

Length Overall (LOA)

A

The Length between the extreme forward and aft points

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2
Q

Length on the Waterline (LWL)

A

Length along the designed waterline from the furthest aft and forward points

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3
Q

Length Between Perpendiculars (LBP)

A

Distance on the summer load waterline from the fore side of the stem to the after side of the rudder post.

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4
Q

Breath Moulded (Bmld)

A

Maximum Breadth measured at midships to the outside of the frameline (inside of plating).

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5
Q

Depth Moulded (Dmld)

A

Vertical distance at amidships from the keel to the uppermost deck, taken from within the inside of the plating.

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6
Q

Draught Moulded (Tmld)

A

Vertical distance from the water surface to the inside of the plating at the keel.

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7
Q

‘Even-Keel’

A

Waterline is parallel to the keel

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8
Q

‘Trimmed by stern’

A

The draught is greatest at the stern.

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9
Q

‘Trimmed by head’

A

The draught at the bow is greatest.

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10
Q

Freeboard

A

Vertical distance from the summer load waterline to the top of the freeboard deck plating measured at amidships.
(Load Line regulations prescribe minimum freeboard)

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11
Q

Extreme dimensions

A

Measurements taken to the outside of the plating (rather than moulded)

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12
Q

Sheer

A

Longitudinal curvature of the deck between the ends of the ship.

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13
Q

Sheer Strake

A

Strake of upper-most continuous shell plating at deck level.

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14
Q

Shell

A

Outer-plating

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15
Q

Superstructure

A

Decked structure above the upper deck, the outboard sides of which are formed by shell plating.

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16
Q

Deckhouse

A

Superstructure found on the upper deck of a ship which doesn’t extend across the full breadth of the ship.

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17
Q

Forecastle Deck

A

Superstructure at the bow formed by having a raised deck.

18
Q

Poop Deck

A

Superstructure at the stern formed by having a raise deck. (The deckhouse normally found on top)

19
Q

Hatch cover

A

Cover creating a waterproof closure

20
Q

Combing

A

Vertical plating around a hatchway. The height of combing reflects the position and relative exposure of the hatch.

21
Q

Bulkhead

A

Vertical transverse or longitudinal division of a ship forming a compartment.

22
Q

Double-bottom

A

Longitudinal structure created by a ‘tank-top’ which runs parallel to the bottom shell over the length of the ship. (void along bottom)

23
Q

6 degrees of freedom

A

1) heave (vertical), 2) yaw (rotation around heave)
3) surge (forwards/ backwards)) 4) roll (rotation around surge)
5) sway (side to side) 6) pitch (rotation around sway)

24
Q

Lines Plan

A

Drawing consisting of the profile, half breadths and body-plan of a ship, illustrating it’s form.

25
Q

Displacement Stations

A

Equally spaced divisions along the length between perpendiculars. (O= aft perpendicular)

26
Q

Hydrostatic Particulars

A

Properties of the hull form derived from the lines plan. Typically areas, volumes, coefficients of form and centroids. Allow for evaluation of a ships performance and dictate the classification of a ship.

27
Q

Bonjean Curves

A

Curves of transverse sectional areas of the ship, drawn along a vertical scale of draught.

28
Q

Archimedes’ Principle

A

Upthrust on a body = Weight of fluid displaced

29
Q

Density of Fresh water

A

1 tonne/m^3

30
Q

Density of Sea water

A

1.025 tonnes/m^3

31
Q

3 Zones of a Ship

A

Entrance, Parallel Mid-Body and Run

32
Q

Entrance

A

Length of the ship forward of the parallel mid-body

33
Q

Parallel mid-body

A

Length of the ship for which the cross section is constant.

34
Q

Run

A

Length of the ship aft of the Parallel mid-body

35
Q

Lightship

A

Combined mass of unladen ship comprised of three components:

1) Steelmass
2) Mass of main and auxiliary machinery
3) Wood and outfit mass

36
Q

Deadweight

A

Mass of payload and consumables

37
Q

Tonnes per Centimeter Immersion (TPC)

A

How many tonnes of additional cargo are required to sink the ship 1cm lower into the water. (increase the draught by 1cm)

38
Q

Tonnage

A

Indicator of size based on volume.

39
Q

Gross Tonnage

A

Indicator of overall size

40
Q

Net Tonnage

A

Indicator of carrying capacity

Naval Architecture Glossary (1 decks)

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