Great Planes PT-60 Kit - GPMA0119 - Manual (Page 34)

D 2. Mount three servos in the die-cut 1/8" ply servo tray
following the manufacturer's recommendations. Position
them as shown in the sketch for the type of engine you
will be using. Install "cross" style horns on all servos.
Place the servo tray on the lower ply fuse doublers toward
the rear of the cabin. Lay your receiver and battery on the
"floor" toward the front of the cabin. Do not glue anything
into position yet, as we want to be able to move things
around to balance the model.
...................Nylon Clevis (1)
D 3. Slide a silicone retainer over the "hex" end of a
nylon clevis. Screw the clevis 14 turns onto the threaded
end of a 36" wire pushrod. Cut six 1/4" bushings from
the plastic inner pushrod tube provided in the kit. Slide the
bushings on the wire pushrod, spacing them as shown on
the plans. Do not shorten the pushrod wires yet, as you
may need to move the servo tray forward of the location
shown to balance the model. Be sure that the bushings on
each end are "in" far enough so that they won't come out
of the pushrod tubes and cause the control to lock in
position. If they are too loose, put a drop of thin CA on the
pushrod wire at each bushing to hold them in place. Make
sure the CA is fully hardened before inserting the
pushrods into the tubes.
2-56 x 5/8" machine screw
...................Nylon Control Horn (2)
D 4. Trim the backing plate from a nylon control horn,
then clip the clevis to the outer hole of the horn (refer to the
photo for step 3). Make a second pushrod assembly
exactly the same as the first.
D 5. Refer to the plans to determine which side the
elevator and rudder pushrods will exit the fuse.
INCORRECT CORRECT
D 6. Insert the pushrods into the tubes in the fuse, then
hold a horn in position on either the elevator or rudder (see
sketch above for correct alignment). The pushrod should
not be bent and should slide easily in the tube. Mark the
location for the horn screws on the control surface.
D 7. Drill 3/32" horn screw holes through the control
surface, then screw the horn in place with two 2-56
machine screws and the backing plate. Repeat for the
other control surface.
D 8. If you will be using one, test fit the aileron servo in the
bottom of the wing. Remove about 1/4" of balsa sheeting
from both ends of the servo opening to allow the servo to fit
flat on the ply servo tray.
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