Great Planes Sportster Bipe 40 Kit - GPMA0510 - Manual (Page 8)

JOINING THE BOTTOM WING PANELS
GLUE THE CENTER RIB TO THE LEFT WING
With the wing panels "up", glue the wedge-shaped
balsa center rib to the root end of the left wing panel. Make
sure the wider edge of the center rib is down and that the
leading edge and trailing edge are centered on the tapered rib.
Use 5 minute epoxy.
PANEL
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2. SAND THE CENTER RIB TO THE WING PANEL
CONTOUR
Rough cut the center rib to the wing airfoil, leaving
it about 1/8" oversize. Sand the remainder away with a sanding
block so that the center rib edges are flush with the wing sheeting
surfaces.
3. JOINTHEWING PANELS; ADDTHEWING PLATES
Join the wing panels upside down. Line up the lead-
ing and trailing edges of the panels. Use a straight edge to
make sure the leading edge of the wing is straight. Block up
the wing 7/8" at the center and glue the panels together using
slow set epoxy. See the drawing on the plan. Remember the
wing is upside down at this point! When the glue is dry, turn
the wing over and mark the aileron servo well location. Add the
1/16 x 2 x 3-1/4 plywoodwing plateto the bottomof the wing.
I
4. GLASS THE CENTER SECTION OF THE WING
DO NOT OMIT THIS STEP!
Doing so may result in a wing failure during flight!
Coat the area where the wings were joined with 5
minute epoxy and use a 4" wide strip of 6 oz. glass or nylon
cloth to reinforce the center joint. Saturate the cloth with
epoxy and then wipe
off any extra epoxy. The cloth strip
should cover both the top and the bottom of the wing joint.
When the epoxy is dry, sand the center section lightly
without sanding into the glass cloth.