Join The Wing Panels - GREAT PLANES Super Sportster 90 Instruction Book

NOTE: Most standard wheels have a 5/32" diameter
axle hole, so you'll have to drill the hubs of your
wheels to fit the 3/16" diameter landing gear wire
supplied in this kit. Start by using a 3/16" drill bit,
but because the nylon hub material is somewhat flex-
ible, it may be necessary to use a 13/64" drill bit to
get the hole large enough to allow the wheel to turn
freely.
D D 24. Glue the 3/32" balsa trailing edge sheeting
to the other side of the wing in the same man-
ner as described in step 15.
L] D 25. Find the 8 balsa center section sheets
(3/32" x 2-5/8" x 10-1/8") and the 4 balsa center
section sheets (3/32 x 1-3/8 x 10-1/8). Glue 2 of
the 2-5/8 wide sheets and one of the 1-3/8 sheets
to the W-l and W-2 ribs on the bottom of the
wing only Now glue just one 2-5/8 piece of
top center section sheeting in place at the trail-
ing edge (the balance of the top sheeting will
be installed after joining the wing panels).
D D 26. Using a razor saw, carefully cut off all ex-
cess sheeting, spars, LE and TE even with W-l.
Now sand the ends of the parts you just
trimmed until they are smooth and flush with
the face of W-l. Also sand the outside face of
the tip rib at this time.
D D 27. Carefully cut out the center portion of the
W-l ribs (1/8" in front and back of the spars),
to make room for the plywood dihedral braces.
D 28. Now go back and repeat steps 5 through
27 to build the left wing panel. Remember,
you will build the left wing panel UPSIDE
DOWN!

JOIN THE WING PANELS

NOTE: Read Steps 1-5, then make a "dry run"
through these steps before actually proceeding.
1. Lay a piece of waxed paper down at the center
of the wing, place the two wing panels together
at the center, and block up both wing tips 1-
1/2".
D 2. Trial fit the 1/8" ply dihedral braces to
make sure they will readily slide into place.
NOTE: Due to the extremely high stresses which
occur at the center of this wing, you must use
30 minute epoxy in the next step to insure
adequate strength.
D 3. Mix up a batch of 30 minute epoxy and spread
it liberally on the front and back of the spars
between ribs W-l and W-2, on the spar ends,
and on one surface of each of the dihedral
braces. Slide the dihedral braces into place and
immediately proceed to the next step.
D 4. Carefully align the leading and trailing
edges of both wing panels at the centerline and,
while holding them in correct alignment, apply
thin CA glue to the center joint to "lock" the
panels together. Do not apply CA glue to
any area that is already coated with epoxy.
Immediately proceed to the next step.
12