1 - 0(Ships principal dimensions and related terms Ships...

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¤ ª*… « ³0 (Ship’s principal dimensions and related terms) ( Ship’s principal dimensionsS Usuallys a ship requires three dimensions to define its size, these are a length , a breath and a depth. Draft is an important dimension for shipping management, sos it is given here. 1. Length There are various ways of defining the length of a ship. First the length between perpendiculars is the distance measured parallel to the base at the level of the summer load waterline from the after perpendicular to the forward perpendicular. The after perpendicular is taken as the after side of the rudder post where there is such a post, and the forward perpendicular is the vertical line drawn through the intersection of the stem with the summer load waterline. In ships where there is no rudder post the after perpendicular is taken as the line passing through the centre line of the rudder pintles. The perpendiculars and the length between perpendiculars are shown in Figure 1.1. It is obvious from Figure 1.1 that the length between perpendiculars (L.B.P.) does not represent the greatest length of the ship. For many purposes, such as the docking of a ship, it is necessary to know what the greatest length of the ship is. This length is known as the ‘length overall (L.O.A.)’ and is defined simply as the distance from the extreme point at the after end to a similar point at the forward end. In most ships the length overall will exceed by a considerable amount the length between perpendiculars. The excess will include the overhang of the stern and also that of the stem where the stem is raked forward. In modern ships having large bulbous bows the length overall may have measured to the extreme point of the bulb. The length on the waterline (L.W.L.) is often used, particularly when dealing with ship resistance. This is the distance measured on the waterline at which the ship is floating from the intersection of the stern with the waterline to the intersection of the stem with the waterline. This length is not a fixed quantity for a particular ship, as it will depend upon the waterline at which the ship is floating and upon the trim of the ship. 2. Breadth The mid point of the length between perpendiculars is called “amidships’ and the ship is usually broader at this point. The breadth is measured at this position and the breadth most commonly used is called the ‘breadth moulded’. It may be defined simply as the distance from the inside of plating on one side to a similar point on the other side measured at the broadest part of the ship.
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