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Ship Terminology - Ship Lines
Terms associated with ship lines and dimensions.
18
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8th Grade
05/17/2010

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Term
Centerline
Definition
The exact center between two lines.
Term
Base Line
Definition
A horizontal line at the bottom of the ship.
Term
Water Line
Definition
Any one of a certain lines of a ship parallel with (and at various heights above) the base line.
Term
Frame Line
Definition
Designates one of the transverse ribs that make up the skeleton of a ship.
Term
Buttock Line
Definition
Vertical planes parallel to the centerline of the ship.
Term
Mold Line
Definition
The exact location of installed structures.
Term
Forward Perpendicular
Definition
A line perpendicular to the baseline, intersecting at the molded draft and forward end of the vessel.
Term
After Perpendicular
Definition
A line perpendicular to the baseline, intersecting the after edge of the sternpost at the designed water line.
Term
Draft or Molded Draft
Definition
Depth of the lowest point of the ship below surface of water when she is afloat.
Term
Molded Depth
Definition
Vertical distance from the molded base line to the top of the uppermost strength deck beam at side, measured at mid-length of vessel.
Term
Sheer
Definition
Forward and aft curvature of deck.
Term
Camber (Athwartship)
Definition
Rise of crown of a deck from side to side.
Term
Tumblehome
Definition
The decreasing of a vessel's beam above the waterline as it approaches the rail. Slant inboard of a ship's side above the bilge.
Term
Deadrise
Definition
Slant up athwartship of the bottom of a ship from keep to bilge.
Term
Keel
Definition
The main fore and aft member of a ship's frame. The keel runs along the bottom connecting the stern and stern and to it are attached the frames of the ship.
Term
Freeboard
Definition
The vertical distance from the waterline to the top of the weather deck at the side.
Term
Beam
Definition
Extreme width of ship.
Term
Dead Flat
Definition
Straight portion of a ship's side.
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