Great Planes Super Sportster 40 MkII Kit - GPMA0205 - Manual (Page 14)

D 4. Refer to the photo above, then use a razor saw or
hobby knife to finish cutting the servo opening in the W-1
ribs. The opening has been partially die-cut.
D 5. Install the die-cut 1/8" ply servo tray support at the
rear of the servo opening. Fit the die-cut 1/8" ply servo tray
into the notch on top of the servo tray support, then press it
into position on top of W-1. The servo tray should be flush
with the top edge of the spar and even with the top edge of
W-1. After you have checked the fit, glue the parts in
position with medium CA.
D 6. Trim a 6-1/2" balsa center skin to fit between the LE
and TE from W-1 to W-3. Align the inboard edge of the skin
with the centerline of the wing (between the two W-1 ribs),
then mark and cut "half" of the servo opening. Enlarge the
sheeting opening 1/4" on both ends to allow the servo
grommets to clear the sheeting. Test fit the sheeting
and servo.
LI 7. Glue the sheeting in position with medium CA.
Note: Because the top of the wing is curved and the servo
tray is flat, apply a thick bead of glue to the top of the servo
tray, then allow the skin to curve naturally without
squeezing it into contact with the servo tray. The CA will
provide support for the skin.
D 8. Cut and install another skin for the other half of the
wing center section. Cut the other half of the servo opening
as you did in step #6.
D D 1. Position the tapered and grooved 1-1/8" x 2-1/2"
hardwood wing center TE pieces over the plans and mark
the location of the aileron torque rod exits. Cut a notch in
the top forward edge as shown in the photo.
D D 2. Hold the wing center TE against the aft edge of the
wing, aligned with the wing's centerline. Mark the torque
rod notches on the top of the wing.
D D 3. Cut shallow notches on the top aft edge of the
wing to allow the torque rod to move freely.
D D 4. Sand the nylon surface of both torque rod tubes
with coarse sandpaper to roughen them up for better
glue adhesion.
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