Top Flite TOPA0150 - Manual (Page 37)

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5. Make the five wing sheeting cradles from the
die-cut 1/8" plywood parts as shown.
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6. Place the wing upside-down on the cradles.
Position the highest cradle over the centerline of the
wing with the tab against the end of the W-1 ribs.
Position the next highest cradles over rib 6. Position
the shortest cradles over rib W-10. Place weights on
the wing to hold it to the cradles. It may take more
weights out toward the tips near the TE to lock-in the
washout built into the wing.
Note: If you find it
helpful, you could tack-glue the cradles to the top
wing sheeting.
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7. Glue both forward skins to the bottom of the
wing. Hold the skins down with T-pins and/or weights.
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8. Now that the forward skins are glued into
position, the aft skins can be trimmed to fit. Trim the
aft skins to fit between the forward skins and the
outer TE spar. The aft edge of the skins should
extend beyond the outer TE spar by approximately
3/32" to allow for trimming later. Glue the aft skins
into position. Use weights and/or T-pins to hold the
sheeting down until the glue dries.
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9. Make the bottom aileron skins from leftover
1/16" balsa sheeting. Bevel the aft edge of the skins
the same as the top skins (with the TE thinned-down
to 1/32"). Glue the bottom aileron skins to the wing
and to the top skins.
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10. After the glue dries, remove the weights and T-
pins and take the wing off the cradles. Finish
sheeting the open area between the forward skin
and the LE with leftover 1/16" balsa. Trim the bottom
of the LE even with the bottom sheeting, but do not
final shape the LE yet.
Build the wing tips
Refer to this photo for the following two steps.
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1. Sand the ends of the wing sheeting even with
the ends of the wing. Glue two of the 3/4" shaped
balsa
wing tips together. Glue the wing tip to one
end of the wing. Make sure the aft end of the wing tip
is even with (or extends slightly beyond) the outer TE
spar (so it can be sanded even later).
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2. Glue the shaped 3/4" balsa aileron tip to the
end of the aileron.
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3. Starting with a razor plane and/or a carving
knife, then finishing with a bar sander and 80-grit
sandpaper, shape the tips to match the wing, but do
not round them yet.
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