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Wing Assembly
1. If you are planning to install retracts, remove
the wood from both wing panels for the retract
servo location. The wood has been partially precut
for exact location.
2. Test fit the plywood forward center rib and the
balsa aft center rib on the left wing panel. The ribs
should not protrude beyond the top and bottom of
the wing. The forward plywood rib will extend
beyond the leading edge of the wing. This
extension will lock the front of the wing into the
fuselage. Do not cut off the extension on the
plywood forward center rib. Use 30-minute
epoxy to glue the center ribs to the left wing panel.
Repeat this step for the right wing panel.
3. Draw a centerline on both sides of the wing
joiner. Test fit the wing joiner into both wing panels.
A snug fit is desirable. If the joiner does not fit
properly, lightly sand any uneven surfaces from the
joiner edges and sides. Note: The wing joiner has
a slight dihedral angle on one edge. This angle will
be on the bottom of the wing.
4. Test fit the wing halves with the wing joiner. If
necessary, sand any high spots on the root end of
the wing panels so there is no gap when you join
them. The top of the wing is flat, with the taper on
the bottom of the wing acting as dihedral. Because
of this, the wing can be joined with the top of the
wing laying flat on your work surface.
Note: The dihedral angle is established by the
angle of the root ribs and the dihedral brace. As
long as the wing halves fit together tightly, you will
have set the correct amount of dihedral.
Make a dry run of the following step without using
any glue so you will know how to clamp your wing
together.
5. Tape a piece of wax paper or plan protector
over your work surface. Thoroughly coat the joiner
pockets and the mating ends of both wing halves
with 30-minute epoxy. Set the wing halves aside
and proceed quickly. Coat all surfaces of one half
of the wing joiner with 30-minute epoxy and place
it in one of the wing halves. Coat the other half of
the joiner with 30-minute epoxy and join the other
wing. Use a piece of balsa or cardboard to wipe
away excess epoxy. Use masking tape to tightly
tape the wing together. Use a tissue dampened
with alcohol to wipe away any more epoxy that
oozes out of the wing, then set the wing aside. Do
not disturb the wing until the epoxy has fully cured.
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