Research and reconstruction of Wooden Ships€¦ · 6/2/2020 · Midship section marked with the...
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Research and reconstruction of Wooden Ships
02.01 Lines Drawings I
Filipe Castro
Last edited: June 2020
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Nautical Archaeology Digital Library – Treatises and Technical Texts on ShipbuildingNautical Archaeology Digital Library – Treatises and Technical Texts on Shipbuilding
Lines Drawings
Lines drawings are a
method to create a 2D
representation of a 3D
object.
Chapelle, Howard, 1983. The Search for Speed Under Sail
1700-1855. London : Conway Maritime Press.
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Lines Drawings
Image from: http://www.aliso.it/mission.php
A set of lines is a collection of
projections of the intersections
of a hull and a series of
parallel, orthogonal planes.
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Lines Drawings
Yassıada c. 625
Archaeologists use lines
drawings to try to reconstruct
the forms of old watercraft.
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Lines Drawings
Unless extensive hull remains are accurately
recorded, lines drawings from shipwreck remains are
conjectural. They should be used as an educated
guess and a working hypothesis, not definitive
reconstructions.
Culip VI c. 1300
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Lines Drawings
The normal reconstruction process entails
three phases:
1. The development of a set of lines
drawings;
2. The development of a set of
construction drawings; and
3. Intact stability tests to assess the
plausibility of each reconstruction
attempt.
Reconstructing shipwrecks from
archaeological remains is an iterative
process that is best done publicly, to
incorporate pier review of each step and
decision taken.
Contarina 1 c. 1300-1700
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Lines Drawings
Computers have changed the reconstruction
process radically in the past decade, and
should be used without prejudice.
It is important to learn how to
draw by hand, but there is
nothing we can do today with a
pencil and an eraser that cannot
be done with a computer mouse.
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Projections
Engineers use several types of projections. This is a widely accepted and tested process, and all the
archaeologist has to know is what kind of projection he will use and follow the rules.
First angle projection (Europe): the object is in a box and each view is pushed through and projected in
the plane furthest from it.
Image: Wikimedia commons
A
B
C
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Projections
A
A
A
B
B
B
C
C
C
Images: Wikimedia commons
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Projections
Third angle projection (US): the object is in a box and each view is projected in the plane closest from
it.Images: Wikimedia commons
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Projections
A
A
A
B
B
B
C
CC
Images: Wikimedia commons
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Projections
In general, representations of the faces of a volume are self-evident.
Third angle projection.
Base on top.
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Nautical Archaeology Digital Library – Treatises and Technical Texts on ShipbuildingNautical Archaeology Digital Library – Treatises and Technical Texts on Shipbuilding
Projections
In general, representations of the faces of a volume are self-evident.
Third angle projection.
Base below.
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Projections
Floor timber faces. Cais do Sodré shipwreck.
A
B
D
C
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Lines Drawings
J. Rhicard Steffy Reconstruction of the Serçe Limanı shipwreck
A
BF E
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Lines Drawings
J. Rhicard Steffy Reconstruction of the Serçe Limanı shipwreck
Sheer Plan
Body Plan
Half-Breath Plan
BowBow
SternStern
Conventions:
1. Bow always represented to the left;
2. Plans called Sheer, Body and Half-Breath;
3. Sections named A, B, C, etc., to the bow and 1, 2, 3, etc. to the stern;
4. Midship section marked with the symbol .
In this phase of your learning curve it is
best to make the midship section the
lowest and widest point of the caprail (or
sheer) line.
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Nautical Archaeology Digital Library – Treatises and Technical Texts on ShipbuildingNautical Archaeology Digital Library – Treatises and Technical Texts on Shipbuilding
Lines Drawings
J. Rhicard Steffy Reconstruction of the Serçe Limanı shipwreck
Conventions:
1. Bow always represented to the left;
2. Plans called Sheer, Body and Half-Breath;
3. Sections named A, B, C, etc., to the bow and 1, 2, 3, etc. to the stern;
4. Midship section marked with the symbol .C B A 1 2 3
C B A 1 2 3 C B A123
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Lines Drawings
J. Rhicard Steffy Reconstruction of the Serçe Limanı shipwreck
C BA 1
2 3
2 21
1
3 3B
B
C
C A
A
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Starting a set of lines
The first step is to determine the length and breath of the vessel we want to draw. Lines drawings
represent the inner surface of the hull planking: the posts are drawn outside the end lines.
CLCenter Line
Center Line
Base Line Base Line
End Line
End Line
End Line
End Line
Length between the posts
Max. Beam
Max. Beam (Half)
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Nautical Archaeology Digital Library – Treatises and Technical Texts on ShipbuildingNautical Archaeology Digital Library – Treatises and Technical Texts on Shipbuilding
Starting a set of lines
The first step is to determine the length and breath of the vessel we want to draw. Lines drawings
represent the inner surface of the hull planking: the posts are drawn outside the end lines.
CLCenter Line
Center Line
Base Line Base Line
End Line
End Line
End Line
End Line
Max. Beam (Half)
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Nautical Archaeology Digital Library – Treatises and Technical Texts on ShipbuildingNautical Archaeology Digital Library – Treatises and Technical Texts on Shipbuilding
Lines Drawings
Half-Breath Plan
Sheer Plan Plan
Body Plan
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Lines Drawings
To trace we have to define a few basic lines, starting with the keel and posts, which have to be
represented in the three plans.
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Lines Drawings
The next step is to draw the sheer line. It must be defined in two of the views (preferably half-breath
and sheer plans) and deduced in the third view.
Sheer Line
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Lines Drawings
To draw the sheer line on the body plan we need to place sections on the sheer and half-breath plans. It
is better to place the sections at even intervals.
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Nautical Archaeology Digital Library – Treatises and Technical Texts on ShipbuildingNautical Archaeology Digital Library – Treatises and Technical Texts on Shipbuilding
Lines Drawings
To draw the sheer line on the body plan we need to place sections on the sheer and half-breath plans. It
is better to place the sections at even intervals.
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Lines Drawings
Once placed and numbered the sections on the sheer and half-breath plans, it is possible to draw the
sheer line on the body plan using offsets.
ABC
AB
C
321
321
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Lines Drawings
Once placed and numbered the sections on the sheer and half-breath plans, it is possible to draw the
sheer line on the body plan using offsets.
3
x
x
y y
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Lines Drawings
Once placed and numbered the sections on the sheer and half-breath plans, it is possible to draw the
sheer line on the body plan using offsets.
3
x3
x
y3 y
Bow
Bow
Bow
Stern
Stern Stern
12 C B A
x0x3 x3
xBxA
xC
y2y1y0
yAyByC
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Lines Drawings
Now the sheer line is traced on all three views and we can start tracing the sections on the body plan.
Because the sections appear as straight lines on the half-breath and sheer plans, we have complete
freedom to trace the sections. Don’t forget: the midship section is supposed to be symmetrical.
Sheer Line
3
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Lines Drawings
Midship section:
Sheer Line
3
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Lines Drawings
The midship section is going to determine much of the shape of the hull. The remaining sections should
be traced as narrower versions of the midship frame.
Midship Section
3
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Lines Drawings
Section A.
3
Section A
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Lines Drawings
Section B.
3
Section B
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Lines Drawings
Section C. Note that the bottom of section C hits the stem, and therefore must be traced as such.
3
Section C
y y
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Lines Drawings
Section 1:
3
Section 1
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Lines Drawings
Section 2:
3
Section 2
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Lines Drawings
Section 3:
3
Section 3
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Lines Drawings
Once the sheer and the sections are traced in the three
views, we need to fair the drawing by sectioning it
longitudinally, in horizontal parallel planes (waterlines), and in
vertical parallel planes (buttock lines).
This process will be explained in the part two of this section of
the class.
Image from Pinterest
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Bibliography
Steffy, J. Richard, 1994. Wooden Shipbuilding and the Interpretation of Shipwrecks, College Station:
Texas A&M University Press.