Figure 22:
The top tapered edge mates with the un-tapered bottom edge
of the next proceeding plank. This makes a smoother flow of
the planks at the ends of the ship and prevents the planks
twisting and dropping away at the ends.
With bow planks start the taper just forward of midships and
again only taper to half the width of the plank.
Stern tapering is a little different. Lay the plank over the
under plank and note where the planks intersect, mark and
taper from this point. The difference here at the stern is
because of the full buttock shapes of the stern bulkheads.
The situation I have just described does not occur in all
ships, some require tapers similar to the forward sections.
It is a matter of studying your particular ship and test
fitting the planks to see where they want to lay. Remember
do not force a plank laterally. This will almost certainly
result in the planks forming a clinker like position which
is hard to overcome. If you see this situation developing
then spiling of the offending plank is required.
Note:
In
figure 22
the hull is in the upright position. When tapering the
hull planks taper the top edge of the plank only as
indicated in
figure 22.
Figure 23:
As with other rules tapering also has its rules
governing what can and what shouldn’t be done. Generally
all tapering should be reasonably long to avoid sharp
bumps and changes in direction. Any bumps which cause a
plank to sit away from its neighbour will result in an
unwanted gap between the two. The top diagram in
figure 22
shows the gap that can result where a taper is too short
and does not give the upper planks lower edge a smooth
surface to mate with. The lower diagram in
figure 22
shows correctly cut and mated planks.
Figure 23A
As has been made mention several times before in
this paper the garboard plank is the odd one out,
where plank tapering is concerned the same applies.
The garboard plank is the ONLY plank to be tapered
on the upper edge when the model is in the upside
down position as shown in
figure 23A.
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