8/13/2023 0 Comments Geometry shape drawingmc, Vc and Vc are the corresponding notations without the keel. ![]() Dc is without the keel.Ĭould be either mass displacement (m) ie the mass of the yacht, or volume displacement (V or V), the volume of the immersed part of the yacht. The vertical distance from the deepest point of the keel to the sheer line (see below). Tc is the draft of the hull without the keel (the 'canoe' body). The maximum draft of the yacht when floating on the designed waterline. The maximum beam at the designed waterline. DWLįig 3.1 Definitions of the main dimensions The maximum beam of the hull excluding fittings, like rubbing strakes. Usually L is obtained by considering the fullness of the bow and stern sections in a more or less complex way. The single most important parameter in any rating rule. The forward perpendicular (FP) is the forward end of the designed waterline, while the aft perpendicular (AP) is the centre of the rudder stock. This length is not much used in yachting but is quite important for ships. The length of the designed waterline (often referred to as the DWL). According to common practice, spars or fittings, like bowsprits, pulpits etc are not included and neither is the rudder. The maximum length of the hull from the forwardmost point on the stem to the extreme after end (see Fig 3.1). A complete list may be found in the International Towing Tank Conference (ITTC) Dictionary of Ship Hydrodynamics. Many more quantities are used in general ship hydrodynamics, but they arc not usually referred to in the yachting field. The list of definitions below includes the basic geometrical quantities used in defining a yacht hull. We recommend a certain work plan for the accurate production of the drawings and, finally, we show briefly how the hull lines are generated in a modern CAD program. Thereafter, we will explain the principles of the traditional drawing and the tools required to produce it. In this chapter we start by defining a number of quantities, frequently referred to in yachting literature, describing the general features of the yacht. For an accurate definition of the hull the traditional lines drawing is still a common tool, although most professional yacht designers now take advantage of the rapid developments in CAD introduced in Chapter 1. Gross features of the hull can be described by dimensional quantities such as length, beam and draft, or non-dimensional ones like prismatic coefficient or slenderness (length/ displacement) ratio. Several setCurve methods are used to specify two endpoints and a control point of the curve, whose coordinates can be defined directly, by the coordinates of other points and by using a given array.Ī very useful method, setCurve(QuadCurve2D), sets the quadratic curve with the same endpoints and the control point as a supplied curve.He hull of a yacht is a complex three-dimensional shape, which cannot be defined by any simple mathematical expression. The QuadCurve2D.Float and QuadCurve2D.Double subclasses specify a quadratic curve in float and double precision. This class represents a quadratic parametric curve segment in (x, y) coordinate space. QuadCurve2D class implements the Shape interface. The package enables you to create a quadratic or cubic curve segment. ![]() Stroke object in the Graphics2D class to define the stroke for the line path. ![]() Line2D.Float(float X1, float Y1, float X2, float Y2).This class includes several setLine() methods to define the endpoints of the line.Īlternatively, the endpoints of the line could be specified by using the constructor for the Line2D.Float class as follows:
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