Framing the
Plank-on-Bulkhead Hull
1. Bending Wood
Building a P-O-B hull requires bending
some wood without distorting its
desired position (doing so stresses glue
joints and fasteners). Although the term
steam bent is used to identify the
process, there are three ways to do it.
Steam bending
: Hold the piece over a
kettle of boiling water and bend. Hold
the wood in position until it cools. It
should remain in that position, but may
spring back slightly.
Soaking
: Submerge the piece in warm
water for several hours. Try adding a
little household or pure ammonia. This
speeds up the soaking process and
makes the fibers slippery so the wood is
easier to bend. After soaking, hold the
piece in position with a fixture and let it
dry completely. Some neat devices are
available for holding steam-bent parts.
Soldering iron:
Large soldering irons
with a tubular end are ideal. Clamp the
iron upright in a vise. While the iron
heats, soak the strip of wood in tap
water. Some modelers prefer bending
around the tube near the handle (it’s not
as hot), while others use the shank.
Move the strip back and forth against
the iron. Its heat turns water into steam
and drives it into the wood. The trick is
to wait until you feel the wood wanting
to yield before starting the bend. Begin
too soon or apply too much pressure
and the strip will break.
Wood dries rapidly, so care must be
taken to avoid scorching. Resoak and
reapply it to the iron until the desired
shape is achieved. Once the piece is
formed, it can go directly on the model.
Because the wood’s memory has been
permanently altered, it will never spring
back to its former shape, meaning no
stress on any timber or fasteners. Spend
some time acquainting yourself with
this method and you’ll never bother
with fixtures again.
Stage 1
Fig. 1-3 Cutting Bulkhead Bevels
Inboard Bevel
Cut Bevel
& Sand
Mark Bevel
10
Fig. 1-1 Center Keel Assembly
Building Board
Weight
Straight Edge
Wax Paper or Plastic Wrap
Fig. 1-2 Cutting the Rabbet into each Side of Center Keel
Fit a Scrap Piece of Plank as You Carve
Plank
Chisel Out
Amid Ships
Rabbet
Cut Depth
Rabbet
Aft & Bow
Bearding Line
Bearding Line
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