How to Determine the Curve of the Transom
determine the curve or radius of the transom it is not enough
to draw this curve on the drawing paper, for this reason: there
are always variations in the finished transom due to errors
in production in the yacht yard, some distortion in the stock
after the hull is done and the stresses are applied to the transom
when the various braces are removed.
New Home Smart-Saw Does The Work of 10 Professional Woodworkers... Click
take off the true profile of the stern transom I use a thin
piece of pine, usually a long, pine clapboard. Hold the thin
edge of the board against the center, horizontally, of the transom
and with the carpenter's scribe run a line along the face of
the board. The pencil marker will make this line so that it
corresponds with the irregularities of the transom. Cut the
stock out along this line with the draw shave, finishing off
with the spoke shave so that when this template is held against
the transom in the same place where it was scribed, all faces
of the curve of the template touch the face of the transom.
try the template at the upper part of the transom, note any
discrepancies with the scribe; then do the same thing with the
bottom of the transom. If the discrepancies are less than an
eighth of an inch, do not try to correct them. It is not necessary.
If they are greater, try to hit a happy medium as this profile
is for the mocked-up or temporary transom you will build for
use in your shop.
second step is to take off the outline (or profile) of the transom
as it exists on the yacht. I do this by placing large sheets
of brown paper over the transom so they cover the piece with
some overlapping of the edges. I fasten the paper to the hull
with masking tape. It comes off the paint work without leaving
any gum. If two or more pieces of paper are required to cover
the transom, I usually lay the upper sheet over the lower and
lay on two or three pencil lines so they cross the overlaps,
one in the center and one at either side. Then I use a soft
pencil and trace off the profile of the transom, using great
care to see that I get it as exact as I can.
make the mock-up, lay the piece of stock you used to get the
radius of the transom on a wide pine board. Trace the curve
on the face of the board. Repeat this process until three boards
are scribed. Then develop the curve, being sure that the bottom
edges of all the boards to be profiled out are straight. Remove
the stock with the draw and spoke shaves. Check the curve against
a line one quarter inch below the curve and finish to that line.
Assemble the profiled boards in such manner that they are held
firmly in a vertical position. Apply a piece of %-inch plywood
to the curved faces of the boards and nail in place with lath
nails. Before nailing, put the template on the face of the plywood
to be sure that it fits snugly. This, then, becomes the surface
to which you will back-cut the carving and on which the outline
of the transom is drawn as well as the design for the carving.