Tolman Jumbo Skiff
A little bit of progress on building
the Tolman Jumbo Skiff. Renn Tolman called for routing
a continuous slot in the bottom hull plates and the
chine shelf. Then cutting and installing a 1" wide
filler of 1/8" thick plywood ("doorskin")
with epoxy to join the shelf to the bottom plate. This
is over a length of 13' !
As you can see there's an angle involved in this joint
and neither the bottom plate nor the shelf plywoods
are totally straight and true. I couldn't figure out
how to set up a jig to support the router as it would
need to travel the entire length of 13'. My solution
was to use biscuit joinery because I could match biscuit
cuts across the bottom plate to the shelf. Bicuits are
~2" long and were at 5" on center and set
in with filled epoxy paste.
I temporarily wire tied the shelf to the bottom plate.
Then I backfilled the gap caused by the angle of the
shelf to the bottom with fiber filled epoxy. Any rebound
of the shelf after the ties were cut would be held in
check by the cured epoxy filler. This entire joint gets
two layers of fiberglass tape on both sides and will
be very strong.
Measurements at several points show that the hull is
symmetrical about the center line
and on spec. So far so good!!
Hull bottom begins to take shape
Section of hull showing biscuit joinery
Clamping joints in place
Section of bottom with completed joint
View from the stern shows fair lines