I was fortunate that Mignonne's
structural bulkheads did not need replacing, just refastening.
However I did have to build
all the 'non structural ones.
At first I curt cardboard
templates but these left me with a lot of trial and error fitting,
scribing, shaving, re fitting, scribing again, shaving a bit more and
wasted not only time but timber.
I then tried making up
template from scraps of light timber glued together in situ with the
hot glue gun. This worked reasonably well but I quickly ran out of
Then someone introduced me to the 'Tick /
This is without doubt the most
accurate and practical method for making any odd shaped pattern.
The 'stick' can be any
scrap timber preferably a stiff piece the length will depend on the
shape you want to trace, for a bulkhead perhaps about a third of the
beam of the boat.
Cut a point at one end and a
couple of notches along the length, these are to make it easy to
relocate the concise position of the stick later.
Next you need a scrap piece of
reasonably stiff plywood.
This needs to be large enough
to be tacked or clamped firmly, vertically along side the proposed
position of the new bulkhead, this will be you 'pattern board'.
The board also needs to have a
clean surface so you can draw on it with a pencil, a coat of white
undercoat will give a perfect surface.
Now that you have that set up, with
the stick flat on the 'pattern board' place its point at a position
the hull that you want to record and then trace the outline of the
stick onto the 'pattern board' with your pencil.
You will need to be able to
put your stick on to the trace in exactly the same position and same
later, this is where the notches come it as reference points.
Repeat this for as many points
as will be needed to create a complete profile of the hull shape
including frames chain-plates etc.
Now take the 'pattern board'
out and lay it on the panel that you wish to cut out.
Clamp it firmly to the
Now take the same tick/joggle
stick and place it onto those penciled outlines on the pattern, then
mark the position of the point onto the panel.
Do the same for all the
positions you have marked then join the points up with a spieling baton
and straight edge.
Cut it out and hope it fits
but don't expect the other side of the hull to be a mirror image.
Better to slap some more white
undercoat on your pattern and do another trace for the other side.
To get the full benefit of any bulkhead
it should be firmly fastened, preferably through bolted to the deck
beams carlines and frames.
Fastening to steam bent frames
will be a problem as they are rarely straight or entirely vertical.
Boats which have been framed
with steam bent frames usually attach the bulkheads on to specially
sawn futtocks, either set between the frames or in place of a frame,
these should be fastened through the planking as would a regular frame.
Fastening a part bulkhead to
the deck beam and joining it to its opposite number with a beam at the
bottom will in effect create a strong ring frame.
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