Great Planes PT-60 Kit - GPMA0119 - Manual (Page 28)

D 2. Test fit the two die-cut 1/8" ply servo tray supports
to the notched front and rear of R-1 C. Insert the die-cut 1/8"
ply aileron servo tray into the shallow notches on the top
end of the supports. The tray must be flush with the top of
the rib.
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 bottom of the wing.
D 3. When satisfied with the fit, glue the parts in position
with medium CA.
D 4. Cut two 4-5/8" x 8-1/4" pieces from the remaining
sheeting skin. The grain runs across the 4-5/8" width. Cut
these skins to fit the bottom center of the wing, from the
"ledge" at R-2/R-3 to the center of R-1 C. Work carefully with
a sanding block to obtain a neat joint at the center. Glue one
skin in position with medium CA, then cut "half" of the
opening for the servo. Glue in the other half of the sheeting,
then finish cutting the servo opening. Remove about 1/4" of
balsa sheeting from the front and rear ends of the servo
openings to allow the servo to fit flat on the ply tray.
D 3. Cut shallow notches on the bottom rear edge of the
wing to allow the torque rods to move freely.
D 4. Sand a slight angle on the inboard edge of the two
wing center TE to permit the two pieces to fit flush when
matched to the dihedral angle.
D 5. Sand the nylon surface of both torque rod tubes with
coarse sandpaper to roughen them up for better
glue adhesion.
D 6. Slide the nylon torque rod tubes as far as they will go
toward the threaded end of the wire torque rods.
Perform the following steps to complete both wing panels.
D 7. Using a toothpick, apply a small amount of petroleum
jelly (Vaseline, etc.) around the torque rods where they enter
and exit the nylon tubes. This procedure will help prevent
the torque rod from "locking up" during the next step.
D 1. Position the tapered and grooved 1-1/2" x 2-3/4"
balsa wing center TE pieces over the plans and mark the
location of the aileron torque rod exits. Cut a notch in the
bottom forward edge of each piece as shown in the photo.
D 8. Apply some 30-minute epoxy to the nylon tubes,
staying clear of the tube's ends. Insert the tubes into the
grooves of the wing center TE. Using a tissue, wipe off any
epoxy that may squeeze out. Apply epoxy to the forward
and inboard edges of the wing center TE pieces, then glue
them in position as shown. Use masking tape to hold the
wing center TE in position while the epoxy cures.
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