Top Flite TOPA0405 - Manual (Page 31)

❏
6. Glue the radiator corners to the fuse. Wetting
these sheets may be required depending on the
softness of the wood. You may need to use tape to
hold the parts until the glue cures.
NOTE: Remove the fuse from your building
surface and reinforce all the difficult-to-reach glue
joints from the inside.
❏
7. Roughly shape the radiator corners with a
knife and a razor plane. Save the final shaping until
after the aft bottom sheeting has been applied.
INSTALL THE FIREWALL
❏
1. A pattern for the gauge to set the firewall
angle is provided on the fuse plan. The plywood
crutch and fuse doublers alone cannot be counted
on to set the correct 1.75° of down thrust. Glue the
pattern to a piece of plywood or cardboard and cut
it out.
❏
2. On your flat building surface, glue the die-cut
1/8" plywood firewall F-1B to F-1C. Sand both
sides of the firewall smooth.
❏
3. Use 30-minute epoxy to glue the die-cut 1/8"
plywood firewall F-1D to the back of F-1B/C. Align
F-1D with the bottom and sides of F-1B/C. Wipe
off any excess epoxy from the notches and tabs.
After the epoxy cures, draw a line 2" up from the
bottom, on the back of F-1D. (This will be used in
step 7 to align the tank floor.)
NOTE: If the firewalls are warped, simply clamping
them together may not “cancel out” the warp. It
is best to clamp the assembly to a table or a
flat board while the epoxy cures.
❏
4. Test fit the firewall assembly into the front of
the fuse with F-1B/C facing forward. Check the
angle with the firewall gauge. Remember, the
crutch and doublers also set right thrust. Make any
necessary adjustments.
❏
5. Use 30-minute epoxy to glue the firewall
assembly to the fuse sides and crutch. Use the
firewall gauge to check the angle. Wipe off any
excess epoxy along the joint between the fuse
sides and the firewall.
❏
6. Use 6-minute epoxy to glue 3/8" balsa
triangle reinforcements between the back of the
firewall and the fuse sides.
- 31 -