Top Flite TOPA0155 - Manual (Page 43)

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20. With the wing in alignment, drill #7 (or 13/64")
holes through the wing and the wing bolt plate inside
the fuse at the marks you made. Hint: Make a drill jig by
using a drill press to drill a perpendicular #7 (or 13/64")
hole through an approximately 1-1/2" x 2" x 2-1/2"
hardwood block. This will ensure that the hole in the
block is perpendicular to the bottom of the wing.
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21. Remove the wing from the fuse. Use a 1/4-20
tap to tap threads into the wing bolt plate. Enlarge
the holes in the wing only with a 17/64" (or 1/4"
[6.4mm]) drill.
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22. Harden the threads in the wing bolt plate by
adding a few drops of thin CA or epoxy and allowing
to fully harden. Re-tap the threads.
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23. Test mount the wing to the fuse with the 1/4-
20 x 2" nylon wing bolts.
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24. Cut two 1" x 1" squares from leftover 1/8"
[3.2mm] plywood. Drill a 17/64" (or 1/4" [6.4mm])
hole through the center of both squares. Place a
wing bolt through one of the squares and insert the
wing bolt into one of the bolt holes in the bottom of
the wing. Cut around the square with a hobby knife.
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25. Remove a 1/8" [3.2mm] deep section of balsa
inside the lines you cut. Glue the square into position
to reinforce the bottom of the wing for the head of the
wing bolt. Do the same for the other wing bolt.
Make the wing fillets
Note: The left wing fillet is shown in the photos, but
both fillets are made at the same time.
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1. With the wing bolted to the fuselage and the 1/32"
[.8mm] plywood fillet bases taped into position, use
medium CA to glue the fillet bases to the ply fuse sides
from inside the fuse only (the fillet bases will be glued
to the fuse sheeting later). Use care not to get any glue
onto the wing. Hint: If you are concerned about
inadvertently gluing the wing to the fillet bases, first
remove the wing and cover the center section with
waxed paper, then bolt the wing back into position.
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2. Turn the model upside-down. Holding the fillet
base to the top of the wing, use medium CA to glue
the aft end of the fillet base to the fuse.
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