Top Flite TOPA0220 - Manual (Page 37)

❏ 13. Reposition the wing on the fuselage making
sure it fits properly and that the belly pan sides are
even with the fuselage sides. Drill a tap hole for the
1/4-20 nylon bolts in the three wing hold down
blocks. Drill the holes at the pin point punch marks.
The holes go through the wing hold down blocks and
also through the fuse hold down blocks under them.
❏ 14. Remove the wing from the fuselage. Drill the
holes in the wing hold down blocks ONLY with a 1/4"
[6.4mm] drill bit. Harden and fuel proof the area with
some thin CA.
❏ 15. Tap the holes in the fuse hold down blocks with a
1/4-20 tap. Harden the tapped holes with a few drops of
thin CA. When the CA cures tap the holes again.
❏
16. Cut the three 1/4 -20 x 2" [51mm] nylon bolts
to a length of 7/8" [22.2mm]. This is necessary to
clear the fuel tank.
❏ 17. From a leftover 1/8" x 1/4" [3.2 x 6.4mm]
basswood stick cut three pieces 1" [25.4mm] long.
Glue these pieces to the ends of the wing hold down
blocks as shown in the photo.
Note: When the wing is mounted there is a 1/8"
[3.2mm] gap between the wing hold down block and
the fuse hold down block. This allows the 1/4-20
wing bolts to flex a bit should you catch a wing tip on
landing. The 1" [25.4mm] sticks stop the wing hold
down blocks from being deformed when the wing
bolts are tightened.
❏ 18. Install the control linkage on the flap servo.
Plug the flap and elevator servos into the receiver,
turn the transmitter on and temporarily plug a battery
into the receiver. Mount the wing to the fuselage and
check the clearance of the flap servo and linkage
with the other servos and linkages in the fuselage.
Operate the flap servo throughout the full range of
motion. If there are any conflicts you may need to
shorten the flap joiner arm slightly. Remove the wing
from the fuselage and unplug the battery and flap
servo. Turn the transmitter off.
If you are installing an electric motor on the model
for power, you will want to build a battery access
hatch in the belly pan. If you are installing a glow
engine then just skip the steps for the hatch and
glue the bottom sheeting into place.
❏ 19. Locate the two die-cut 3/32" [2.4mm] balsa belly
pan sheeting parts. Use your bar sander to sand the
edges flat and straight where the parts join. Edge glue
both parts together using either thin CA or aliphatic
resin. Align the parts even at the front edges. Use your
bar sander with 150-grit sandpaper to sand the
assembled belly pan sheeting flat and smooth.
❏
20. Glue the belly pan sheeting to the bottom of
the belly pan with medium CA. Drill 1/4" [6.4mm]
holes through the sheeting for the wing bolts.
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