It is evident that the part of the ship which is significance for its propulsion is the part of the ship's hull which is under the water line.The dimensions below describing the hull form refer to the design draught, which is less than, or equal to, the scantling draught. The choice of the design draught depends on the degree of load, i.e. whether, in service, the ship will be lightly or heavily loaded. Gen- erally, the most frequently occurring draught between the fully-loaded and the ballast draught is used.
Ship's lengths LOA, LWL, and LPP 선박의 길이 전장, 수선장, 그리고 수선간 길이
The overall length of the ship Loa is normally of no consequence when calculating the hull's water resistance. The factors used are the length of the waterline Lwl and the so-called length between perpendiculars Lpp. The di- mensions referred to are shown is Fig. 2.
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