Great Planes Super Sportster 40 MkII Kit - GPMA0205 - Manual (Page 13)

D 2 Coat the exposed aft surface of the ply wing dowel
support with 30-minute epoxy Use a stick or brush to
apply epoxy to the forward edge of both wing spars and the
1/8" x 1-7/16" x 6-1/8" die-cut ply forward dihedral brace
Slide the brace into the slot until it touches W-2
D 3 Completely coat one side of the 1/8" x 5/8 x 6-1/8"
die-cut ply aft dihedral brace with 30-minute epoxy, then
insert it behind (and gluing it to} the forward dihedral brace
Work a little epoxy around the edges to obtain a good bond
with the spars
CA is much harder than balsa, so when you sand edge
glued sheets you will usually end up with a ridge along the
joint To avoid this problem, the Great Planes Model Shop
team has reverted to using wood glue for this application
We prefer Great Planes Wood Glue as it sets quickly, is
water resistant, and sands easily We put a blob of the
glue on a sheet of waxed paper, then apply it to the edge
of the wood with a fingertip After joining the sheets, wipe
off any excess with a tissue, then use a couple of strips of
masking tape to hold the sheets together while the glue
sets
Sand the joint by using a sanding block and 220-grit
sandpaper Work the block in a circular motion across the
joint until smooth
D 1 Cut eight 6-1/2" long pieces of sheeting from two
3/32" x 3" x 30" balsa sheets Lightly sand off the edges to
remove balsa fuzz Make four center skins by edge gluing
four pairs of the 6-1/2" sheets together.
D 4 Working quickly apply 30-minute epoxy to the wing
dowel support and spars of the other wing panel and also
to the mating surfaces of the W-1 ribs Slide the two wing
panels together Glue the 1/8" alignment dowel to the inside
of the second wing panel Make sure the panels are aligned
from LE to TE, then clamp or tape the two panels together.
D 5 Before the wing joining epoxy has cured, work some
30-minute epoxy into both of the dowel holes in the LE
Insert the 1/4" x 2-7/8" hardwood wing dowels through the
LE and into the ply aft dowel support
D D 2 Trim one of the bottom skins to fit between the LE
and TE sheeting from W-1 to W-3 Be sure that the skin
covers only one W-1 rib Glue it in place.
D 3 Repeat step 2 for the other wing panel IMPORTANT:
Be sure to obtain a good glue joint along the wing's
centerline where the sheeting fits together Place a pad of
foam rubber on top of your workbench to protect the bottom
sheeting from hangar rash while you work on the top surface.
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