Top Flite TOPA0410 - Manual (Page 32)

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❏ 5. Clean the 1/4-24 blind nuts with isopropyl alcohol and
use epoxy to glue them into the mounting holes from the
back of the firewall.
Option: If your engine mount comes with blind nuts, use
epoxy to glue them into the mounting holes from the back
of the firewall. If your engine mount uses a different
mounting method, follow the manufacturers mounting
instructions.
❏ 6. Use 30-minute epoxy to glue the firewall into the fuse
crutch. The face of the firewall should be flush with the
forward edges of the crutch. Important: Make sure the
firewall is installed with the blind nuts offset to the left side
(as viewed from the cockpit with the fuselage right side up)
of the crutch. Wipe off the excess epoxy with a paper towel
dampened with isopropyl alcohol before the epoxy cures.
❏ 7. From the remaining 1/2" [12.7mm] balsa triangle
stick, use epoxy to glue firewall reinforcements along
the joint between the firewall and the crutch sides, top and
bottom.
SHEET THE BOTTOM OF THE FUSE
❏ 1. Use a sanding bar to blend the stringers to the formers.
❏ 2. To provide a larger gluing surface for the lower fuse
sheeting, glue leftover pieces of 1/8" balsa to the front of
former F-6D, from the main stringer to the first 1/4"
stringer. Sand the balsa flush with the former.
5" [127mm]
24" [609.6mm]
3" [76.2mm]
❏ 3. Cut four 5" long pieces from a 1/8" x 3" x 24" balsa sheet.
Make two forward lower fuse sheets by edge gluing one 1/8"
x 3" x 24" balsa sheet and two 3" x 5" balsa sheets together.
❏ 4. Trim the aft edge of the forward lower fuse sheet so
that it covers the 1/8" balsa on the front of former F-6D.
❏ 5. Glue the lower fuse sheet to the main stringer. After the
CA cures, wet the sheet; apply medium or thick CA to the
formers and stringers and wrap the sheet around the
structure. Trim the sheet to the middle of the bottom stringer.
❏ 6. Apply the second lower fuse sheet to the other side
of the fuse.
1" [25.4mm]
15" [381mm]
❏ 7. Make four aft lower fuse sheets from four 1/8" x 3" x
30" balsa sheets following the sketch above.
❏ 8. Glue the aft lower fuse sheet in place, from the main
stringer to the center of the first stringer, using the same
technique used on the upper fuse sheet. Start by gluing
the sheet at the middle of the main stringer and working
toward the ends. It will be necessary to wet the outer
surface of the sheet to permit bending.