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sheet and set it aside for the next step. The leading edge brace
is not used in a two-piece wing.
DD 17. Punch out the three C1 clamps from the 1/8" die-
cut plywood sheet (SPRTW08). Test fit two of the dihedral
brace "halves" to the "root" (inner) end of the inner panel
spars. One brace should be installed on the front of the spars
and the other on the back. The edge that you cut with the razor
saw should be near the end of the spars and it should be placed
so that it slants in at the top (short edge at top). Use the C1
clamps to hold the braces in place and test fit the wing joiner
lamination into the box formed. This "box'' will be referred
to as the "joiner box". The wing joiner lamination is used to
make sure the spars remain the correct distance apart.
DD 18. Remove the clamps and apply a bead of epoxy or
thick CA along the spar edges. Install the braces and hold in
place with the C1 clamps. A good glue joint is important here
but be careful not to get any excess glue inside the box formed
by these braces, or the wing joiner will not fit inside. Also test
the size of the joiner box with the joiner lamination while the
glue is curing. Be careful: don't glue the joiner lamination.
DD 19. Tightly wrap the joiner box with a strong thin
thread and then soak it with thin C/A. This will add a lot of
strength to the joiner box. Do not overlap the thread or allow
it to build up too thick.
DD 20. Locate one of the 1/16" x 3" x 24" Balsa Sheets
(SPRTW17) and cut it into 8 pieces 2-3/8" long. Slide one of
the sheets in place in front of the joiner box and trim to fit as
shown in the photo. Use another piece of sheeting to shim the
front edge up against the bottom of the ribs as shown in the
following sketch. Glue it in place,
1/16"
balsa
scrap
DD 21. Glue another piece to the rear of the joiner box and
then cut a third piece to fit behind the second and glue it in
place.
12
1/16" Balsa
bottom sheet
Work Surface
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