Begin Construction; Fuelproof The Fuselage; Join The Wing Halves - GREAT PLANES Extra 300S Instruction Manual

BEGIN CONSTRUCTION

Fuelproof the Fuselage

1. Coat the firewall and all other bare wood around the
firewall with fuelproof paint or 30-minute epoxy thinned with
alcohol. Fuelproof other areas of bare wood in the fuselage
that may be exposed to fuel or engine exhaust such as the
fuel tank area and the front and back of the wing saddle.
Avoid getting epoxy in the threads of the blind nuts in the
back of the firewall.
2. Set the fuselage aside while the paint dries and you
work on the wing.

Join the Wing Halves

1. Cut the covering 1/8" inside the edges of the
opening in the bottom of the right wing panel for the aileron
servo. Use your Top Flite MonoKote Trim Iron to seal the
covering to the sides of the opening.
Note: Inside the wing you'll notice a piece of string with a
piece of wood tied to it. Don't remove the string because
you will use it to pull your aileron servo cord through the
wing later.
2. Cut the covering from the half-inch hole in the top
of the wing sheeting near the root (for your servo cords to
exit) and from the hole near the TE for the wing bolt.
3. Repeat this procedure for the left wing panel.
4. Use 30-minute epoxy to glue both 1/8" x 15/16" x 5-1/4"
plywood wing joiners together. Wipe away any excess epoxy.
5. 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.
Make a dry run of the following step without using any
glue so you will know how to clamp your wing together.
6. 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 two
C-clamps to hold the front of the wing together and use
masking tape to tightly tape the rest of the wing together.
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