The principal dimensions of a vessel are its linear dimensions: length, breadth, depth and draft, which are necessary to know for ship construction, operation and repair. Principal dimensions are subdivided into design, overall and overall dimensions depending on the purpose of definition. Consider these dimensions in more detail.
Values of the values
- L - structural waterline length - the distance measured in the structural waterline plane between the points of intersection of the bow and stern with the diametric plane;
- L - length between perpendiculars - the distance measured in the ELC plane between the fore and aft perpendiculars.
- Nose perpendicular is the line of intersection of the diametric plane with the vertical transverse plane passing through the foremost point of the structural waterline.
- Stern perpendicular is the line of intersection of the diametric plane with the vertical transverse plane, passing through the intersection point of the rudder pivot axis with the plane of the AOC. If there is no rudder, the aft perpendicular is defined as the line of intersection of the diametric plane with the vertical transverse plane, which is 97% of the EEL length from the bow perpendicular.
As a stern perpendicular for ships with a submerged transom stern, the vertical plane passing through the bottom point of the side projection of the transom slice may be taken as a stern perpendicular.
- L greatest length - the distance measured in the horizontal plane between the extreme points of the fore and aft ends of the hull (including the end superstructures) without projecting parts;
- L overall length - the distance measured in the horizontal plane between the extreme points of the fore and aft ends of the hull, taking into account the permanently protruding parts;
- B - width - distance measured at mid-ship between the theoretical board surfaces perpendicular to the diameter plane, at the level of the structural waterline;
- B - greatest width - the distance measured perpendicular to the diametrical plane between the outermost points of the hull without taking into account projecting parts (gunwale beams, fenders, etc.);
- B - overall width - the distance measured perpendicular to the diametrical plane between the outermost points of the hull with the projecting parts taken into account;
- H - board height - vertical distance measured at mid-ship from the main plane to the board line of the upper deck;
- T - draft - vertical distance measured in the plane of the midshipman from the main plane to the plane of the structural or design waterline.
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