Great Planes Piper J-3 Cub 40 Kit - GPMA0160 - Manual (Page 21)

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8. Sand the front and side TOP edges of the die-cut 1/16"
plywood Wing Bolt Plate (CUB4W05) to a feathered edge.
Leave the TE square. The top of the wing bolt plate has the
embossed centerline and punch marks on it. Align the
embossed centerline with the centerline of the wing and
securely glue the wing bolt plate to the top of the wing TE so
the punch marks are showing.
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1.Tape waxed paper over the aileron section of the wing plan.
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2. Position the 3/32" x 2-11/32" x 18" balsa Aileron
Base (CUB4W16) over the aileron view on the wing plan
and carefully mark the rib locations on both sides of the
aileron base using the guides printed on the plan.
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3. Slide the Aileron Base into the groove of the 3/8"
x 5/8" x 18" grooved balsa Aileron LE (CUB4W17). Position
the base so it is perpendicular to the face of the LE and glue
it in place with thin CA.
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4. Cut the Aileron Ribs from the 3/32" x 1/4" x 30"
balsa stick (CUB4W18). Glue the ribs to both sides of the
ailerons lining them up with the rib locations you marked
earlier. Make sure the ribs are perpendicular to the aileron
base and tight against the LE.
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5. Use a razor plane and a T-bar or other good flat
sanding block to shape the ribs to the cross section shown
on the wing plan. As you can see on the cross section, the
ribs should taper to nothing near the TE of the aileron.
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6. Repeat steps 2 - 5 to make a 2nd aileron.
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7. Draw an accurate centerline along the LE of the
ailerons and the wing TE. Use a razor plane and a sanding
block to shape the Aileron LE to the “V” shape shown on
the aileron cross-section view on the wing plan. Sand the
ends of the ailerons if needed.
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8. Designate one aileron as Left and write an “L” on it
somewhere. Write an “R” on the other one. Test fit the Left
aileron into the left wing panel and check to make sure there
is approximately a 1/16" gap at both ends of the aileron. Sand
the ends or add scrap balsa to the ends of the ailerons to
adjust the width of this gap. Do the same for the Right aileron.
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9. Glue the 1/4" x 1" shaped balsa Aileron Control Horn
Mounting Block (CUB4W19) in place as shown on the
Build the Ailerons
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