Top Flite TOPA0405 - Manual (Page 11)

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19. Remove the stab from the building surface.
Trim off the jig tabs with a sharp knife. Trim and
blend the LE and TE to the top of the ribs as you
did before in step 15. Check all glue joints, adding
glue as necessary.
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20. If you want to modify the stab for the scale
balance tabs, now is the time to add the appropriate
structure. Refer to the plan for the locations and
sizes of the balance tabs (parts not included).
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21. From the 3/4" x 3/4" x 30" balsa stick, cut
3/4" long hinge point backups. Glue the backups
in position as shown on the plan. Sand the
backups flush with the top of the stab ribs.
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22. It is important to get a good glue bond
between the stab structure and the bottom stab
skins. Apply a heavy bead of medium or thick CA to
all of the bottom edges of the right side of the stab
structure. Place a skin on the structure and hold it in
place with your hands until the glue sets. Repeat
this procedure for the left stab skin. Be careful not to
bend or twist the stab during this step.
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23. Sand the ends of the stab skins, LE and TE
flush with the sides of the S-6 ribs. Round the LE of
the stab to match the stab cross-section shown on
the plan.
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24. Glue the shaped 3/4" balsa stab tips onto
both ends of the stab. Use a razor plane and
sanding bar to shape the stab tips to match the
contour of the stab.
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25. If you are building the stab with notches for
balance tabs, trim the openings at this time.
BUILD THE FIN
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1. From a 3/8" x 3/8" x 30" balsa stick make the
fin LE.
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2. Glue the die-cut 1/4" balsa fin forward TE (F)
and aft TE (A) together. Lightly sand the edges of
the TE’s to blend them together.
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3. Locate the die-cut 1/8" balsa fin ribs V-1
through V-6. Pin the ribs to your building surface
over their proper locations. Center the LE on the
front of the ribs and glue in place. Note: The fin LE
protrudes through the stab and into former F-11.
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4. Center the fin TE on the aft edge of the ribs
and glue in place.
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5. Apply medium CA to any joints that do not
appear to be well glued.
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