|THE MODERN CLINKER PLY METHOD
For this, we will use a
couple of different Selway Fisher Designs as examples but mainly
the Kane Suffolk Beach Punt.
A. First a
building jig is built using chipboard moulds (section shapes) - these are
usually given with "corners" or lap points - is
"cornered" shapes so that the clinker laps are pre-determined by
the design. The transom, inner stem (missing from the above photo at this
point) and the hog (inner keelson) are all fitted - the inner stem, hog
and transom are all glued/fastened to each other but are only temporarily
fastened to the moulds.
(stringers) are fitted into slots cut at the plank land positions on the
moulds but are kept short of the inner stem and probably only fry butted
against the forward side of the transom.
garboard and next 2 planks are in place - the ribbands help define the
shape of the planks and give something to clamp the plank edges too -
screws used to hold the planks together whilst the epoxy cures and which
go into the ribbands, are later removed - it important that no glue comes
between the inside face of the planks and the ribbands unless, of course,
the ribbands are to be permanent stringers within the hull structure.
C. Above is a
view inside the bow of a clinker Kane Beach Punt showing the inner stem
attached to the hog.
D. A similar
bow on the outside - note 2 items here - first, the outer stem which has
been laminated directly over the exposed edges of the plywood planks and
second, the fact that the planks are all "flush" with one
another at the stem - a similar view of the planking at the aft end would
also show the planks "flush" with each other as they go over the
transom. If this was not done, the planks would stick out over each other
with gaps needing filling with the inner stem and the wjole affair would
look very ugly - to avoid this and end up with a nice flush appearance
each plank has a "let" or "gain" cut into it. This is
a tapering rebate which goes from nothing in depth a few feet back from
the stem to full plank thickness depth right at the end of the plank. The
width of this "gain" is the width of the overlap between two
adjacent planks - therefore one plank gradually sits in this rebate ending
flush with it at the extreme end.
E. Above is
the hull of a clinker Islay Skiff (Pandora by Rob Johnsey) with the jig
removed from it - the inner stem was laminated over a former attached to
the first mould.
F. The clinker
shell of a Kane Suffolk Beach Punt by Ian Gardner recently removed from
Kane being fitted out with lockers, seats and water ballast tanks - note
that in this example, the ribbands/stringers have been left in as part of
the structure - this is often done when thinner plywood is used for the
H. Above - 2
examples of finished boats - left is Ina Gardner's Kane Suffolk Beach Punt
and right is Ron Johnsey's Islay Skiff.