What this plan still needs. It reads your actual project, so it is a
checklist rather than a manual — click any step to go there.
In one line
Trace every line in the half-breadth plan — sheer, chine and each
waterline — and sheer, chine and keel/rabbet in the profile. Use the preset names:
a curve in one view is paired to the other by its name, and a mismatch drops it silently.
From the dimension chain
Type the bay spacings straight off the plan, aft to forward.
x6 repeats a bay. Feet-inches-eighths, decimals and metric all work.
Station list
One per line: name, position — position measured along the axis
from the calibration origin. Edit freely, or use the Station tool to click them off the sheet.
Sections are worked out by cross-referencing your two views — the same way
a draftsman derives the body plan. Each waterline you traced in the half-breadth view
contributes a point at its own height; the sheer, chine and keel contribute points from
both views at once.
Output
Planking
The hull is split at every landing — any curve named as a chine,
lap, land or knuckle — and each region between them is one plank. On a multi-chine
lapstrake hull the plan has already told you where the planks go, so nothing needs
choosing. Where it hasn't (a round-bilge hull, or a plywood side you want in two pieces)
the strake counts below divide a region further, by girth — arc length round the
section, which is what makes planks come out an even width.
Parts
Pick what you want. Molds nest onto stock just like panels do.
Assembly diagram
The panels shaded onto your own plan, so you can see what each piece is
and where it goes. Dashed lines mark where one panel hands over to the next. It goes
into both exports — as a picture in the files, and drawn as geometry in the PDF.
Export
Two exports, and they are the same package in two formats: the
table of offsets, the strongback setup, the sections, the body plan, the backbone
profile, the assembly diagram, the full-size lofting sheets, the nested stock sheets
and every part on its own. Both list anything that appears in only one of them, and
why. Both use the parts you selected above.
Scale against waste
Scaling a hull does not scale its waste. The stock stays 4 × 8
whatever you do, so as the boat grows each panel walks across the sheet until it no
longer fits — then splits, and the offcut it leaves is dead. The result is a
sawtooth, not a slope, and it cannot be reasoned out from the drawing: the whole
boat has to be nested at every scale and counted.
Two things about the boat change too, and neither is
proportional. Displacement goes as the cube — at ×0.8 a two-person
boat becomes a solo one. And panel thickness wants k1.5,
not k, so scaling a hull geometrically under-builds it. Both are in the table.