Great Planes Piper J-3 Cub 40 Kit - GPMA0160 - Manual (Page 19)

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2. Prepare the 1/16" x 1-1/2" x 36" balsa Top Leading Edge
Sheeting (CUB4W25) by sanding the front edge to a slight
bevel so it will fit snugly against the LE (check by trial fitting).
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3. Position the LE sheeting against the rear edge of the
LE moving it left or right until it is just overlapping the #2 rib.
Using thin CA, glue the front (beveled) edge of the LE
sheeting to the LE.
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4. Prop up the wing on its LE as shown in the photo.
Apply a generous drop of thick CA to the top edge of each
rib and allow it to flow down to the LE. Also apply a
generous bead of thick CA to the top of the forward spar.
Immediately lay the wing panel down on a flat surface and
bend the LE sheeting down onto the ribs and forward spar.
Hold the sheeting down with something flat (like a T-Bar or
flat block of wood) until the glue cures. It is important to
keep the wing flat until the glue has cured or you may
build a warp into the wing!
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5. Wet the LE sheeting with a wet paper towel from rib #7
to the end of the sheet. Form the sheeting down against the
wing tip and glue along the LE and the edge of the wing tip.
Hold the sheeting against the wing tip until the glue sets.
Trim the sheeting even with the wing tip.
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6. Place the 1/16" x 1-3/8" x 36" Top TE sheeting
(CUB4W13) in place against the tapered TE so the inboard
end of the sheeting is even with the wing centerline. Cut a
notch in the TE sheeting at rib #7 to allow it to sit down onto
the rib. Securely glue the sheeting in place and then trim it
along the outboard TE and rib #7 just as you did for the
bottom TE sheeting.
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7. Lightly sand the bottom edges of the ribs to smoothly
blend them to the bottom forward spar. Also remove any glue
bumps or other irregularities along the leading and trailing
edges. Note: DO NOT sand off the bottom of the rib behind
the forward spar, because a “Step” must be maintained at the
aft edge of the spar for the 1/16" sheeting. Examine the cross
section on the wing plan before proceeding.
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8. Install the 1/16" x 1-1/4" x 36" balsa Bottom LE Sheeting
(CUB4W26) following the same sequence you used on the top
LE sheeting.
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9. Wet and form the bottom leading edge sheeting at the
wing tip like you did the top leading edge sheeting. Glue the
sheeting to the LE and the wing tip, then trim the sheeting
and sand the entire tip as shown in the photo.
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