The following photos describe how we produced frame templates for the Glen-L Hot Rod. We might be building more than
one boat, so developing the templates may save a ton of layout work if we ever build another one.
Click on any photo for a larger image.
The frame outline board is depicted at the top of the photo. It's made from 3/8" plywood and is used to assemble frame
parts. it also ensures assembly accuracy and provides unobstructed access for clamping around the perimeter of the frame.
The frame templates are visible at the bottom of the photo.
Templates are made from select grade 3/8" exterior plywood. They are temporarily affixed to lumber stock so parts can be trimmed
with a router equipped with a top-bearing flush trim bit.
At the bottom of the photo, you'll notice another set of templates. These are for a 1/4" marine grade plywood
lamination which is bonded to the frame before the frame gusset are added. This will prevent the frame lumber
from splitting and adds more strength, as the lamination overlaps the frame joints.
Close-up view of the top, side and bottom futtocks.
Frame templates are assembled on the frame outline board. Covering the board with plastic film before assembling the
frame components will prevent the epoxied parts from sticking to the outline board.
Close-up view. The side futtock (frame member) usually runs from the top of the sheer
to the bottom chine edge. When the chines are screwed to the frames with long screws, the screws will have a tendency to
split the lumber if driven into a futtock with edge grain. The screw will have more holding power and won't
split the lumber if driven across the grain.
3/8" marine grade plywood gussets are applied to the frame.
Close-up view of the gusssts.
Close-up view of the floor timber. It can be made from the same stock used for the frames,
or with 3/4" marine grade plywood. The plywood may be a better choice as its more stable than lumber
and won't split like wide pieces of lumber are prone to do.
Here are the 1/4" marine grade plywood templates. These laminations are bonded to one side of the frame before the frame gusset
are added. They prevent the frame lumber from splitting and add strength.
Close-up view. The laminations overlap the frame joints.
Close-up view at the keel junction.
With judicious nesting of parts, frame 7 would require a single piece of 1"x8"x8' lumber. Once all the frame templates were
completed, the parts were laid out to minimize lumber waste. The dimensions of the nested parts were entered into an Excel
spreadsheet and grouped by width to produce a lumber shopping/cut list. Click
here to see the spreadsheet.
Here's a photo of the completed frames and floor timbers.