英语翻译The above cuts through the hull are sufficient for defining the shape,but another two families of cuts are usually added,to aid in the visualperception of the body.Buttocks are introduced in the profile plan,showing vertical,longitudinal

英语翻译The above cuts through the hull are sufficient for defining the shape,but another two families of cuts are usually added,to aid in the visualperception of the body.Buttocks are introduced in the profile plan,showing vertical,longitudinal
英语翻译
The above cuts through the hull are sufficient for defining the shape,
but another two families of cuts are usually added,to aid in the visual
perception of the body.Buttocks are introduced in the profile plan,
showing vertical,longitudinal cuts through the hull at positions
indicated in the half breadth plan .The diagonals in the lower part of
the half breadth plan are also quite important.They are obtained by
cutting the hull longitudinally in different inclined planes,as indicated
in the body plan.The planes should be as much as possible at right
angles to the surface of the hull,thus representing its longitudinal
smoothness.In practice,the flow tends to follow the diagonals,at least
approximately,so that they are representative of the hull shape as `seen'
by the water.Special attention should be paid to the after end of the
diagonals,where knuckles,not noticed in the other cuts,may be found,
particularly on IOR yachts from the 1970s and the 1980s.Almost
certainly,such unevenness increases the resistance and reduces the speed
of the yacht
The other line in the lower part of the half breadth plan is the curve of
sectional areas,representing the longitudinal distribution of the submerged
volume of the yacht.The value at each section is proportional to the
submerged area of that section,while the total area under the curve
represents the displacement (volume).A more detailed description of the
construction of the curve of sectional areas will be given in Chapter 4
In order to define exactly the shape of the hull a table of offsets is
usually provided by the designer.This is to enable the builder to lay out
the lines at full size and produce his templates.Offsets are always
provided for the waterlines.but the same information may be given for
diagonals and/or buttocks also.Note that all measurements are to the
outside of the shell

英语翻译The above cuts through the hull are sufficient for defining the shape,but another two families of cuts are usually added,to aid in the visualperception of the body.Buttocks are introduced in the profile plan,showing vertical,longitudinal
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