Great Planes F-15 Eagle 40 Kit - GPMA0438 - Manual (Page 30)

D 1. Tape the wing panel plan to your flat work
surface, and cover it with waxed paper (so you
won't glue the wing to the plan!). NOTE: Do not
cut the left and right wing half drawings apart. We
recommend you build this wing in one piece.
Two warped spars installed this
way will result in a straight wing
D 2. Carefully punch out all the die-cut 3/32"
and 1/8" balsa wing ribs. Sand the edges slightly
to remove any die-cutting irregularities or "fuzz".
Two warped spars installed this
way will result in a warped wing
D 2. Sand one end of each 1/8" x 3/8" x 18"
balsa spar doubler (F154W08) to a 2" taper as
shown in the "Wing Spar Detail" on the plan.
D 3. Glue the spar doublers to the 1/8" x 3/8" x
30" balsa spars (F154W07) with thick CA as
shown in the "Wing Spar Detail." Take your time
and press the spar assembly flat against the work
surface while the glue is curing. Also rotate the
assembly onto its side and press it down to keep
the doubler and spar aligned and straight. Do this
on a flat work surface and most warps can be
eliminated. Wipe off any excess glue before it
cures.
D 3. Place two spars in position on the plan with
the spar doublers up, and the thick end (two
laminations) toward the root (center of the wing).
These will be the right and left bottom spars. The
tapered end of the spar doublers should end just
inside rib #8. Cut the root of the spars to the
correct angle at the wing centerline so they fit
together nicely. Securely glue the two spars
together with either thick CA or epoxy and cross
pin the spars in place.
In the next several steps, notice that the
bottom a ft jig-tabs are marked with a vertical
slit cut near the middle of the jig tab.
BUILD THE WING PANELS
NOTE: This wing is constructed with
1-3/4° of washout built-in. When the
wing is upright, the tabs on the rear
portion of the ribs set the ribs at the
proper angles to achieve this slight
twist. When you flip the wing over to
work on the bottom side, the j i g tabs on
the top of the wing will hold the correct
washout in the wing. If the tabs break
off during construction, tack glue or
tape them back on.
D 4. Position the #3 ribs on the spars in their
correct position. Install the die-cut 1/8" ply wing
face plate (F154W06) between the ribs and glue it
to the ribs. Make sure the ribs are lined up with
the plans and glue them to the spars.
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