The Gougeon Brothers on Boat Construction - WEST SYSTEM Epoxy

178 First Production Steps
Figure 16-9 Laying off diagonals.
Pick up these dimensions from the centerline out along the diagonal to
the station intersections. Transfer them to the appropriate stations
in the half breadth plan to be faired.
Oblique view for illustration only
Locating ends of the diagonals
Once you have completed the fairing process, ink all of
the waterlines, buttocks, and diagonals. Use the same
ink color that you used to represent these lines in the
grid and label all of the lines so that they are easily
identified. Also ink the body plan, although the stations
that will be used to make mold frames or bulkheads, etc.
will go through a planking thickness deduction process.
Lofting Hull Components
When the basic fairing of the hull lines is finished, the
lines on the lofting board very accurately describe the
shape of the hull at any given point. In addition to
giving the shapes for the permanent frames, bulkheads,
and temporary molds, the lofting can be used to
develop special patterns for the stem and keel, jigs for
laminating, hardware, etc. <strong>The</strong>re are a number of references
to such uses of the lofting throughout this book.
If this is your first boatbuilding project, we recommend
that you read the entire book and note the references
that apply to your boat. This will ensure that you make
maximum use of the lofting. Using the lofting as a tool,
<strong>The</strong>se heights from
the body plan give the
intersection of the
diagonal plane B with
the profile.
you can now develop the shape of parts so that you can
manufacture them to fit accurately in their respective
areas of the hull.
For instance, if a bulkhead falls between stations 3 and
4, erect a perpendicular line from the baseline at the
location of the bulkhead. Place a clean pick-up stick
along this line with one end touching the baseline and
the sharp edge of the stick just touching the bulkhead
line. Using one ink color, pick up the keel profile height
of each buttock and the height of the sheer above the
baseline. Using another ink color, pick up the distances
from the centerline to the deckline and to all of the
waterlines. You should, of course, be labeling all of the
marks as you are making them. Using another ink
color, pick up the distances of the diagonals from the
centerline. <strong>The</strong>n take this pick-up stick to the body
plan and transfer all the information as you have done
previously to develop the station sections. Using a thin
batten, draw in this new section, which will represent
the shape of the hull at the location of the bulkhead
before planking thickness is subtracted.