Great Planes F4 Phantom - GPMA0440 - Manual (Page 13)

The main wing is built as one assembly, upside down over
the wing plan.
1. Cover the wing plan with wax paper or Great Planes
Plan Protector. Trim the 3/8" x 3/8" end of two main spars
to the angle shown on the plan. Use 6-minute epoxy to glue
the ends of two of the main spars together. Pin the main
spars (longest spar against the building board) over the
wing plan.
5. Insert the 1/16" plywood center plate in the notch in
2. Glue the shaped 3/8" balsa spar joiner to both main
spars with 30-minute epoxy.
rib R-1. Trim the 3/8" x 3/8" end of the two remaining main
spars, at an angle, so they fit against each other similar to
the top spars (remember the wing is built upside down).
Also, check that the spar is flush with the bottom edge of
the wing ribs.
6. Fit the balsa spar joiner between the bottom main
spars, in the notch of ribs R-1.
7. Test fit the die-cut 1/8" balsa sub front cap to the
front of ribs R-1 and R-2.
3. Use 30-minute epoxy to glue the die-cut 1/16" plywood
center plate over the main spars and the spar joiner.
4. Pin the die-cut wing ribs R-1, R-2, R-3, R-4, R-5, R-6,
R-7 and R-8 in position over the main spar, perpendicular
to the building board. The notches in the ply rib doublers
will need to be enlarge slightly to allow the main spars to fit.
Do not glue the ribs until instructed to do so.
Note: The jig tabs should be contacting the plan. Use
small T-pins to pin the aft jig tabs to the building board
over their location on the plan.
8. Test fit the die-cut 1/8" balsa sub trailing edge to the
aft end of the ribs. The root end of the sub TEs will need to
be beveled for a good butt joint.
9. Make sure the top main spar, wing ribs and jig tabs
are securely pinned to your building board. Glue the ribs
perpendicular to the top main spar.
10. Use a straightedge and building square to keep the
parts straight and perpendicular as you glue the balsa sub
front cap to the front and the sub trailing edge to the aft end
of the ribs.
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