Displacement Ships Float by displacing their own weight in water. The Ship is supported by its buoyancy. (Archimedes Principle)

Water line where the ship is designed to float

Intersection of planes (buttock lines) parallel to the centerline plane

Supported by underwater foils, like wings on an aircraft. Dangerous in heavy seas. No longer used by USN.

opposite of flare

vertical distance measured from keel to deck taken at amidships and deck edge in case the ship is cambered on the deck

vertical distance from keel to the water surface

imaginary vertical line located at either the rudder stock or intersection of the stern with DWL

parallel planes from forward to aft, evenly spaced (like bread).Normally an odd number to ensure an even number of blocks.

Intersection of planes (waterlines) parallel to the baseline (keel).

Vessel rides on a cushion of air. Lighter weight, higher speeds, smaller load capacity.

locate the bottom of the ship

Hydrodynamics pressure developed on the hull at high speeds to support the vessel. Limited loads, high power requirements.

imaginary vertical line where the bow intersects the DWL

transverse distance measured amidships

horizontal distance from FP and AP

An object partially or fully submerged in a fluid will experience a resultant vertical force equal in magnitude to the weight of the volume of fluid displaced by the object.

outward curvature of ship’s hull surface above the waterline

transverse distance across the each section

transverse curvature given to deck

the point midway between FP and AP ( ) Midships Station

Intersection of planes to define section line - Sectional lines show the true shape of the hull form - Forward sections from amidships : R.H.S. - Aft sections from amid ship : L.H.S.

longitudinal curvature given to deck

Overall length of the vessel

distance from depth to draft (reserve buoyancy)

Supported by moving water. At slower speeds, they are hydrostatically supported